1
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Jing L, Deplazes E, Clegg JK, Wu X. A charge-neutral organic cage selectively binds strongly hydrated sulfate anions in water. Nat Chem 2024; 16:335-342. [PMID: 38351381 DOI: 10.1038/s41557-024-01457-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 01/19/2024] [Indexed: 02/16/2024]
Abstract
In biological systems, enzymes and transport proteins can bind anions in aqueous media solely by forming hydrogen bonds with charge-neutral motifs. Reproducing this functionality in synthetic systems presents challenges and incurs high costs, particularly when targeting strongly hydrated anions such as sulfate. Here we report a [2.2.2]urea cryptand (cage), synthesized in one pot, that selectively binds sulfate in a mixture of dimethyl sulfoxide and water and in water with affinities in the micromolar to millimolar range. The neutral cage bearing six urea groups donates 12 strong hydrogen bonds to encapsulate a sulfate anion, showing favourable enthalpy even in pure water. Sulfate binding can be further enhanced by using micelles to provide a low-polarity microenvironment. The cage finds utility in analysing divalent anions in water and beverage samples or in removing sulfate. The work demonstrates the achievability of robust and selective anion binding in water with minimal synthetic efforts, by using neutral NH hydrogen bonds akin to those found in biology.
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Affiliation(s)
- Liuyang Jing
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen, China
| | - Evelyne Deplazes
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, Australia.
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, Australia
| | - Xin Wu
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Sciences, Xiamen University, Xiamen, China.
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, Australia.
- MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.
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2
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Williams OHL, Rusli O, Ezzedinloo L, Dodgen TM, Clegg JK, Rijs NJ. Automated Structural Activity Screening of β-Diketonate Assemblies with High-Throughput Ion Mobility-Mass Spectrometry. Angew Chem Int Ed Engl 2024; 63:e202313892. [PMID: 38012094 DOI: 10.1002/anie.202313892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/08/2023] [Accepted: 11/27/2023] [Indexed: 11/29/2023]
Abstract
Embracing complexity in design, metallo-supramolecular self-assembly presents an opportunity for fabricating materials of economic significance. The array of accessible supramolecules is alluring, along with favourable energy requirements. Implementation is hampered by an inability to efficiently characterise complex mixtures. The stoichiometry, size, shape, guest binding properties and reactivity of individual components and combinations thereof are inherently challenging to resolve. A large combinatorial library of four transition metals (Fe, Cu, Ni and Zn), and six β-diketonate ligands at different molar ratios and pH was robotically prepared and directly analysed over multiple timepoints with electrospray ionisation travelling wave ion mobility-mass spectrometry. The dataset was parsed for self-assembling activity without first attempting to structurally assign individual species. Self-assembling systems were readily categorised without manual data-handling, allowing efficient screening of self-assembly activity. This workflow clarifies solution phase supramolecular assembly processes without manual, bottom-up processing. The complex behaviour of the self-assembling systems was reduced to simpler qualities, which could be automatically processed.
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Affiliation(s)
| | - Olivia Rusli
- School of Chemistry, UNSW Sydney, Sydney, NSW, 2052, Australia
| | - Lida Ezzedinloo
- School of Chemistry, UNSW Sydney, Sydney, NSW, 2052, Australia
| | - Tyren M Dodgen
- Waters Corporation Australia, Rydalmere, NSW, 2116, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Nicole J Rijs
- School of Chemistry, UNSW Sydney, Sydney, NSW, 2052, Australia
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3
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Baby Sainaba A, Venkateswarulu M, Bhandari P, Clegg JK, Sarathi Mukherjee P. Self-Assembly of an [M 8 L2 4 ] 16+ Intertwined Cube and a Giant [M 12 L1 6 ] 24+ Orthobicupola. Angew Chem Int Ed Engl 2024; 63:e202315572. [PMID: 37985377 DOI: 10.1002/anie.202315572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
Through coordination-driven self-assembly, aesthetically captivating structures can be formed by tuning the length or flexibility of various components. The self-assembly of an elongated rigid terphenyl-based tetra-pyridyl ligand (L1) with a cis-Pd(II) acceptor produces an [M12 L16 ]24+ triangular orthobicupola structure (1). When flexibility is introduced into the ligand by the incorporation of a -CH2 - group between the dipyridylamine and terphenyl rings in the ligand (L2), anunique [M8 L24 ]16+ water-soluble 'intertwined cubic structure' (2) results. The inherent flexibility of ligand L2 might be the key factor behind the formation of the thermodynamically stable and 'intertwined cubic structure' in this scenario. This research showcases the ability to design and fabricate novel, topologically distinctive molecular structures by a straightforward and efficient approach.
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Affiliation(s)
- Arppitha Baby Sainaba
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Mangili Venkateswarulu
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Pallab Bhandari
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland-St. Lucia, St. Lucia, Queensland 4072, Australia
| | - Partha Sarathi Mukherjee
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
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4
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Siddique RG, Whittaker JJ, Al-Fayaad HA, McMurtrie JC, Clegg JK. Remote stereocentres do not disrupt the stereochemical coupling in homochiral [M 2L 3] helicates and [M 4L 6] tetrahedra. Dalton Trans 2023; 52:13487-13491. [PMID: 37725064 DOI: 10.1039/d3dt02486e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
Despite the use of achiral ligands, the vast majority of metallosupramolecular assemblies containing octahedral tris-bidentate metal centres show strong stereochemical communication between metal centres, generally resulting in homochiral assemblies even though they are statistically disfavoured. Here we show that when resolved stereocentres are attached to the central part of a quaterpyridine ligand, the stereochemical coupling from this centre is insufficient to disrupt the strong stereochemical communication between metal centres in both [M2L3] helicates and [M4L6] tetrahedra.
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Affiliation(s)
- Rashid G Siddique
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
| | - Jacob J Whittaker
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
| | - Hydar A Al-Fayaad
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
| | - John C McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
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5
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Janetzki JT, Chegerev MG, Gransbury GK, Gable RW, Clegg JK, Mulder RJ, Jameson GNL, Starikova AA, Boskovic C. Controlling Spin Crossover in a Family of Dinuclear Fe(III) Complexes via the Bis(catecholate) Bridging Ligand. Inorg Chem 2023; 62:15719-15735. [PMID: 37691232 DOI: 10.1021/acs.inorgchem.3c02598] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Spin crossover (SCO) complexes can reversibly switch between low spin (LS) and high spin (HS) states, affording possible applications in sensing, displays, and molecular electronics. Dinuclear SCO complexes with access to [LS-LS], [LS-HS], and [HS-HS] states may offer increased levels of functionality. The nature of the SCO interconversion in dinuclear complexes is influenced by the local electronic environment. We report the synthesis and characterization of [{FeIII(tpa)}2spiro](PF6)2 (1), [{FeIII(tpa)}2Br4spiro](PF6)2 (2), and [{FeIII(tpa)}2thea](PF6)2 (3) (tpa = tris(2-pyridylmethyl)amine, spiroH4 = 3,3,3',3'-tetramethyl-1,1'-spirobi(indan)-5,5',6,6'-tetraol, Br4spiroH4 = 3,3,3',3'-tetramethyl-1,1'-spirobi(indan)-4,4',7,7'-tetrabromo-5,5',6,6'-tetraol, theaH4 = 2,3,6,7-tetrahydroxy-9,10-dimethyl-9,10-dihydro-9,10-ethanoanthracene), utilizing non-conjugated bis(catecholate) bridging ligands. In the solid state, magnetic and structural analysis shows that 1 remains in the [HS-HS] state, while 2 and 3 undergo a partial SCO interconversion upon cooling from room temperature involving the mixed [LS-HS] state. In solution, all complexes undergo SCO from [HS-HS] at room temperature, via [LS-HS] to mixtures including [LS-LS] at 77 K, with the extent of SCO increasing in the order 1 < 2 < 3. Gas phase density functional theory calculations suggest a [LS-LS] ground state for all complexes, with the [LS-HS] and [HS-HS] states successively destabilized. The relative energy separations indicate that ligand field strength increases following spiro4- < Br4spiro4- < thea4-, consistent with solid-state magnetic and EPR behavior. All three complexes show stabilization of the [LS-HS] state in relation to the midpoint energy between [LS-LS] and [HS-HS]. The relative stability of the [LS-HS] state increases with increasing ligand field strength of the bis(catecholate) bridging ligand in the order 1 < 2 < 3. The bromo substituents of Br4spiro4- increase the ligand field strength relative to spiro4-, while the stronger ligand field provided by thea4- arises from extension of the overlapping π-orbital system across the two catecholate units. This study highlights how SCO behavior in dinuclear complexes can be modulated by the bridging ligand, providing useful insights for the design of molecules that can be interconverted between more than two states.
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Affiliation(s)
- Jett T Janetzki
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Maxim G Chegerev
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | - Gemma K Gransbury
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K
| | - Robert W Gable
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Jack K Clegg
- University of Queensland, St Lucia, Queensland 4072, Australia
| | | | - Guy N L Jameson
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
| | - Alyona A Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | - Colette Boskovic
- School of Chemistry, University of Melbourne, Victoria 3010, Australia
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6
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Hum G, Phang SJI, Ong HC, León F, Quek S, Khoo YXJ, Li C, Li Y, Clegg JK, Díaz J, Stuparu MC, García F. Main Group Molecular Switches with Swivel Bifurcated to Trifurcated Hydrogen Bond Mode of Action. J Am Chem Soc 2023. [PMID: 37267593 DOI: 10.1021/jacs.2c12713] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Artificial molecular machines have captured the full attention of the scientific community since Jean-Pierre Sauvage, Fraser Stoddart, and Ben Feringa were awarded the 2016 Nobel Prize in Chemistry. The past and current developments in molecular machinery (rotaxanes, rotors, and switches) primarily rely on organic-based compounds as molecular building blocks for their assembly and future development. In contrast, the main group chemical space has not been traditionally part of the molecular machine domain. The oxidation states and valency ranges within the p-block provide a tremendous wealth of structures with various chemical properties. Such chemical diversity─when implemented in molecular machines─could become a transformative force in the field. Within this context, we have rationally designed a series of NH-bridged acyclic dimeric cyclodiphosphazane species, [(μ-NH){PE(μ-NtBu)2PE(NHtBu)}2] (E = O and S), bis-PV2N2, displaying bimodal bifurcated R21(8) and trifurcated R31(8,8) hydrogen bonding motifs. The reported species reversibly switch their topological arrangement in the presence and absence of anions. Our results underscore these species as versatile building blocks for molecular machines and switches, as well as supramolecular chemistry and crystal engineering based on cyclophosphazane frameworks.
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Affiliation(s)
- Gavin Hum
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Si Jia Isabel Phang
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - How Chee Ong
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Felix León
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Shina Quek
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Yi Xin Joycelyn Khoo
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Chenfei Li
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Yongxin Li
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Cooper Road, St Lucia 4072, Queensland, Australia
| | - Jesús Díaz
- Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria Extremadura, Avda de la Universidad s/n, Cáceres 10003, Spain
| | - Mihaiela C Stuparu
- School of Chemistry, Chemical Engineering & Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
| | - Felipe García
- Departamento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, Julián Claveria 8, Oviedo 33006, Asturias, Spain
- School of Chemistry, Monash University, Clayton 3800, Victoria, Australia
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7
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Ghanbari B, Asadi Mofarrah L, Clegg JK. Selective Supramolecular Recognition of Nitroaromatics by a Fluorescent Metal-Organic Cage Based on a Pyridine-Decorated Dibenzodiaza-Crown Macrocyclic Co(II) Complex. Inorg Chem 2023; 62:7434-7445. [PMID: 37134276 DOI: 10.1021/acs.inorgchem.3c00693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Two isomorphous fluorescent (FL) lantern-shaped metal-organic cages 1 and 2 were prepared by coordination-directed self-assembly of Co(II) centers with a new aza-crown macrocyclic ligand bearing pyridine pendant arms (Lpy). The cage structures were determined using single-crystal X-ray diffraction analysis, thermogravimetric, elemental microanalysis, FT-IR spectroscopy, and powder X-ray diffraction. The crystal structures of 1 and 2 show that anions (Cl- in 1 and Br- in 2) are encapsulated within the cage cavity. 1 and 2 bear two coordinated water molecules that are directed inside the cages, surrounded by the eight pyridine rings at the "bottom" and the "roof" of the cage. These hydrogen bond donors, π systems, and the cationic nature of the cages enable 1 and 2 to encapsulate the anions. FL experiments revealed that 1 could detect nitroaromatic compounds by exhibiting selective and sensitive fluorescence quenching toward p-nitroaniline (PNA), recommending a limit of detection of 4.24 ppm. Moreover, the addition of 50 μL of PNA and o-nitrophenol to the ethanolic suspension of 1 led to a significant large FL red shift, namely, 87 and 24 nm, respectively, which were significantly higher than the corresponding values observed in the presence of other nitroaromatic compounds. The titration of the ethanolic suspension of 1, with various concentrations of PNA (>12 μM) demonstrated a concentration-dependent emission red shift. Hence, the efficient FL quenching of 1 was capable of distinguishing the dinitrobenzene isomers. Meanwhile, the observed red shift (10 nm) and quenching of this emission band under the influence of a trace amount of o- and p-nitrophenol isomers also showed that 1 could discriminate between o- and p-nitrophenol. Replacement of the chlorido with a bromido ligand in 1 generated cage 2 which was a more electron-donating cage than 1. The FL experiments showed that 2 was partially more sensitive and less selective toward NACs than 1.
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Affiliation(s)
- Bahram Ghanbari
- Department of Chemistry, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran
| | - Leila Asadi Mofarrah
- Department of Chemistry, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
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8
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Pfrunder MC, Marshall DL, Poad BLJ, Fulloon TM, Clegg JK, Blanksby SJ, McMurtrie JC, Mullen KM. Diastereomer Resolution of M₄L₆ Coordination Cages by Ultra-High-Resolution Ion Mobility-Mass Spectrometry. Angew Chem Int Ed Engl 2023:e202302229. [PMID: 37186056 DOI: 10.1002/anie.202302229] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 04/24/2023] [Accepted: 04/25/2023] [Indexed: 05/17/2023]
Abstract
Coordination cages can be used for enantio- and regioselective catalysis and for the selective sensing and separation of isomeric guest molecules. Here, stereoisomers of a family of coordination cages are resolved using high-resolution cyclic ion mobility-mass spectrometry (cIM-MS). The observed ratio of diastereomers is dependent on both the metal ion and counter ion. Moreover, the point groups can be assigned through complementary NMR experiments. This method enables the identification and interrogation of the individual isomers in complex mixtures of cages which cannot be performed in solution. Furthermore, these techniques allow the stability of individual isomers within the mixture to be probed, with the T-symmetric isomers in this case shown to be more robust than the C3 and S4 analogues.
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Affiliation(s)
- Michael C Pfrunder
- Queensland University of Technology, School of Chemistry and Physics, AUSTRALIA
| | - David L Marshall
- Queensland University of Technology, Central Analytical Research Facility (CARF), AUSTRALIA
| | - Berwyck L J Poad
- Queensland University of Technology, School of Chemistry and Physics, AUSTRALIA
| | - Therese M Fulloon
- Queensland University of Technology, School of Chemistry and Physics, AUSTRALIA
| | - Jack K Clegg
- University of Queensland - Saint Lucia Campus: The University of Queensland, School of Chemistry and Molecular Biosciences, AUSTRALIA
| | - Stephen J Blanksby
- Queensland University of Technology, School of Chemistry and Physics, AUSTRALIA
| | - John C McMurtrie
- Queensland University of Technology, School of Chemistry and Physics, AUSTRALIA
| | - Kathleen Mary Mullen
- Queensland University of Technology, School of Chemistry and Physics, Faculty of Science, QUT, 2 George St, 4001, Brisbane, AUSTRALIA
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9
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Thompson AJ, Smith KML, Clegg JK, Price JR. CX-ASAP: a high-throughput tool for the serial refinement and analysis of crystallographic data collected under varying conditions. J Appl Crystallogr 2023; 56:558-564. [PMID: 37032967 PMCID: PMC10077850 DOI: 10.1107/s1600576723000298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 01/11/2023] [Indexed: 03/04/2023] Open
Abstract
CX-ASAP is a new open-source software project designed to greatly reduce the time required to analyse crystallographic data collected under varying conditions. Scripted in Python3, CX-ASAP can automatically refine, finalize and analyse data collections with wide-ranging temperatures, pressures etc. This is achieved using a reference structure, allowing for quick identification of problems, phase changes and even model comparison. The modular design means that new features and customized scripts can be easily added, tailoring the capabilities to the specific needs of the user. It is envisioned that CX-ASAP will help to close the growing gap between fast collection times and slow data finalization.
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10
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Thompson AJ, Powell JA, Melville JN, McMurtrie JC, Clegg JK. Crystals of Aliphatic Derivatives of [Cu(acac) 2 ] have Distinct Atomic-Scale Mechanisms of Bending. Small 2023:e2207431. [PMID: 36932939 DOI: 10.1002/smll.202207431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 01/12/2023] [Indexed: 06/18/2023]
Abstract
Molecular crystals displaying elastic flexibility have important applications in the fields of optoelectronics and nanophotonic technologies. Understanding the mechanisms by which these materials bend is critical to the design of future materials incorporating these properties. Based on the known elastic properties of bis(acetylacetonato)copper(II), a series of 14 aliphatic derivatives are synthesized and crystallized. All those which grew in a needle morphology display noticeable elasticity, with 1D chains of π-stacked molecules parallel to the long metric length of the crystal a consistent crystallographic feature. Crystallographic mapping is used to measure the mechanism of elasticity at an atomic-scale. Symmetric derivatives with ethyl and propyl side chains are found to have different mechanisms of elasticity, which are further distinguished from the previously reported mechanism of bis(acetylacetonato)copper(II). While crystals of bis(acetylacetonato)copper(II) are known to bend elastically via a molecular rotation mechanism, the elasticity of the compounds presented is facilitated by expansion of their π-stacking interactions.
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Affiliation(s)
- Amy J Thompson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Joshua A Powell
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Jamie N Melville
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - John C McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, QLD, 4000, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
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11
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Hasija A, Thompson AJ, Singh L, S N M, Mangalampalli KSRN, McMurtrie JC, Bhattacharjee M, Clegg JK, Chopra D. Plastic Deformation in a Molecular Crystal Enables a Piezoresistive Response. Small 2023; 19:e2206169. [PMID: 36587988 DOI: 10.1002/smll.202206169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/24/2022] [Indexed: 06/17/2023]
Abstract
Organic materials are promising candidates for the development of efficient sensors for many medicinal and materials science applications. Single crystals of a small molecule, 4-trifluoromethyl phenyl isothiocyanate (4CFNCS), exhibit plastic deformation when bent, twisted, or coiled. Synchrotron micro-focus X-ray diffraction mapping of the bent region of the crystal confirms the mechanism of deformation. The crystals are incorporated into a flexible piezoresistive sensor using a composite constituting PEDOT: PSS/4CFNCS, which shows an impressive performance at high-pressure ranges (sensitivity 0.08 kPa-1 above 44 kPa).
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Affiliation(s)
- Avantika Hasija
- Crystallography and Crystal Chemistry Laboratory, Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal By-Pass Road, Bhopal, MP, 462066, India
| | - Amy J Thompson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Lakhvir Singh
- i-lab, Electrical Engineering and Computer Science, Indian Institute of Science Education and Research Bhopal, Bhopal, MP, 462066, India
| | - Megha S N
- Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chennai, Kanchipuram, 603203, India
| | - Kiran S R N Mangalampalli
- Department of Physics and Nanotechnology, Faculty of Engineering and Technology, SRM Institute of Science and Technology, SRM Nagar, Kattankulathur, Chennai, Kanchipuram, 603203, India
| | - John C McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, QLD, 4000, Australia
| | - Mitradip Bhattacharjee
- i-lab, Electrical Engineering and Computer Science, Indian Institute of Science Education and Research Bhopal, Bhopal, MP, 462066, India
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Deepak Chopra
- Crystallography and Crystal Chemistry Laboratory, Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal By-Pass Road, Bhopal, MP, 462066, India
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12
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Jesus MCD, Wapling J, Kiem E, Stockdale T, Whittaker JJ, Clegg JK, Leach D, Church T, Collins R, Leach G, Hewitt D, Voss JJD, Blanchfield JT. Phytochemical composition of Denhamia obscura (A. Rich.) Meisn. Ex Walp. root bark, seeds and leaves. ARKIVOC 2022. [DOI: 10.24820/ark.5550190.p011.828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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13
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Siddique RG, Arachchige KSA, Al-Fayaad HA, McMurtrie JC, Clegg JK. Sterics and metal-ion radius control the self-assembly of [M 2L 3] helicates. Dalton Trans 2022; 51:12704-12708. [PMID: 35943089 DOI: 10.1039/d2dt02241a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interplay of many factors influences the outcomes of self-assembly reactions. Using an acetylene-appended quaterpyridine ligand we show that both the size of the metal ion and the presence of steric repulsion between the acetylene groups result in the exclusive formation of [M2L3] helicates rather than a helicate/tetrahedron equilibrium.
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Affiliation(s)
- Rashid G Siddique
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
| | - Kasun S A Arachchige
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
| | - Hydar A Al-Fayaad
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
| | - John C McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld, 4072, Australia.
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14
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Ahmed M, Arachchige KSA, Xie Z, Price JR, Cruddas J, Clegg JK, Powell BJ, Kepert CJ, Neville SM. Guest-Induced Multistep to Single-Step Spin-Crossover Switching in a 2-D Hofmann-Like Framework with an Amide-Appended Ligand. Inorg Chem 2022; 61:11667-11674. [PMID: 35862437 DOI: 10.1021/acs.inorgchem.2c01253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A detailed study of the two-dimensional (2-D) Hofmann-like framework [Fe(furpy)2Pd(CN)4]·nG (furpy: N-(pyridin-4-yl)furan-2-carboxamide, G = H2O,EtOH (A·H2O,Et), and H2O (A·H2O)) is presented, including the structural and spin-crossover (SCO) implications of subtle guest modification. This 2-D framework is characterized by undulating Hofmann layers and an array of interlayer spacing environments─this is a strategic approach that we achieve by the inclusion of a ligand with multiple host-host and host-guest interaction sites. Variable-temperature magnetic susceptibility studies reveal an asymmetric multistep SCO for A·H2O,Et and an abrupt single-step SCO for A·H2O with an upshift in transition temperature of ∼75 K. Single-crystal analyses show a primitive orthorhombic symmetry for A·H2O,Et characterized by a unique FeII center─the multistep SCO character is attributed to local ligand orientation. Counterintuitively, A·H2O shows a triclinic symmetry with two inequivalent FeII centers that undergo a cooperative single-step high-spin (HS)-to-low-spin (LS) transition. We conduct detailed structure-function analyses to understand how the guest ethanol influences the delicate balance between framework communication and, therefore, the local structure and spin-state transition mechanism.
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Affiliation(s)
- Manan Ahmed
- School of Chemistry, The University of New South Wales, Sydney 2052, Australia
| | - Kasun S A Arachchige
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Zixi Xie
- The School of Chemistry, The University of Sydney, Camperdown, New South Wales 2006, Australia
| | - Jason R Price
- Australian Synchrotron, ANSTO Clayton, Victoria 3800, Australia
| | - Jace Cruddas
- School of Mathematics and Physics, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Benjamin J Powell
- School of Mathematics and Physics, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Cameron J Kepert
- The School of Chemistry, The University of Sydney, Camperdown, New South Wales 2006, Australia
| | - Suzanne M Neville
- School of Chemistry, The University of New South Wales, Sydney 2052, Australia
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15
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Ahmed M, Zenere KA, Sciortino NF, Arachchige KSA, Turner GF, Cruddas J, Hua C, Price JR, Clegg JK, Valverde-Muñoz FJ, Real JA, Chastanet G, Moggach SA, Kepert CJ, Powell BJ, Neville SM. Regulation of Multistep Spin Crossover Across Multiple Stimuli in a 2-D Framework Material. Inorg Chem 2022; 61:6641-6649. [PMID: 35442030 DOI: 10.1021/acs.inorgchem.2c00530] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigate the effects of a broad array of external stimuli on the structural, spin-crossover (SCO) properties and nature of the elastic interaction within the two-dimensional Hofmann framework material [Fe(cintrz)2Pd(CN)4]·guest (cintrz = N-cinnamalidene 4-amino-1,2,4-triazole; A·guest; guest = 3H2O, 2H2O, and Ø). This framework exhibits a delicate balance between ferro- and antiferro-elastic interaction characters; we show that manipulation of the pore contents across guests = 3H2O, 2H2O, and Ø can be exploited to regulate this balance. In A·3H2O, the dominant antiferroelastic interaction character between neighboring FeII sites sees the low-temperature persistence of the mixed spin-state species {HS-LS} for {Fe1-Fe2} (HS = high spin, LS = low spin). Elastic interaction strain is responsible for stabilizing the {HS-LS} state and can be overcome by three mechanisms: (1) partial (2H2O) or complete (Ø) guest removal, (2) irradiation via the reverse light-induced excited spin-state trapping (LIESST) effect (λ = 830 nm), and (3) the application of external hydrostatic pressure. Combining experimental data with elastic models presents a clear interpretation that while guest molecules cause a negative chemical pressure, they also have consequences for the elastic interactions between metals beyond the simple chemical pressure picture typically proposed.
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Affiliation(s)
- Manan Ahmed
- The School of Chemistry, UNSW Sydney, Sydney 2052, New South Wales, Australia
| | - Katrina A Zenere
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
| | - Natasha F Sciortino
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
| | - Kasun S A Arachchige
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Gemma F Turner
- School of Molecular Sciences, The University of Western Australia, Perth 6009, Western Australia, Australia
| | - Jace Cruddas
- School of Mathematics and Physics, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Carol Hua
- School of Chemistry, The University of Melbourne, Parkville 3010, Victoria, Australia
| | - Jason R Price
- The Australian Synchrotron, 800 Blackburn Road, Clayton 3168, Victoria, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia 4072, Queensland, Australia
| | | | - Jose A Real
- Insitut de Ciencia Molecular, Department de Quimica Inorganica, Universitat de Valéncia, Patterna 46980, Valéncia, Spain
| | - Guillaume Chastanet
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, Pessac F-33600, France
| | - Stephen A Moggach
- School of Molecular Sciences, The University of Western Australia, Perth 6009, Western Australia, Australia
| | - Cameron J Kepert
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
| | - Benjamin J Powell
- School of Mathematics and Physics, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Suzanne M Neville
- The School of Chemistry, UNSW Sydney, Sydney 2052, New South Wales, Australia
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16
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Sainaba AB, Venkateswarulu M, Bhandari P, Arachchige KSA, Clegg JK, Mukherjee PS. An Adaptable Water-Soluble Molecular Boat for Selective Separation of Phenanthrene from Isomeric Anthracene. J Am Chem Soc 2022; 144:7504-7513. [PMID: 35436087 DOI: 10.1021/jacs.2c02540] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Anthracene crude oil is a common source of phenanthrene for its industrial use. The isolation of phenanthrene from this source is a challenging task due to very similar physical properties to its isomer anthracene. We report here a water-soluble Pd(II) molecular boat (MB1) with unusual structural topology that was obtained by assembling a flexible tetrapyridyl donor (L) with a cis-Pd(II) acceptor. The flexible backbone of the boat enabled it to breathe in the presence of a guest optimizing the fit within the cavity. The boat binds phenanthrene more strongly than anthracene, which enabled separation of phenanthrene with an >98% purity from an equimolar mixture of the two isomers using MB1 as an extracting agent. MB1 represents a unique example of a coordination receptor suitable for selective aqueous extraction of phenanthrene from anthracene with reusability of several cycles.
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Affiliation(s)
- Arppitha Baby Sainaba
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Mangili Venkateswarulu
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Pallab Bhandari
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | | | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Partha Sarathi Mukherjee
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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17
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Clegg JK, Li F, Lindoy LF. Oligo-β-diketones as versatile ligands for use in metallo-supramolecular chemistry: Recent progress and perspectives. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214355] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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18
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Siddique RG, Arachchige KSA, AL‐Fayaad HA, Thoburn JD, McMurtrie JC, Clegg JK. Controlling the Complexity and Interconversion Mechanisms in Self‐Assembled [Fe
2
L
3
]
4+
Helicates and [Fe
4
L
6
]
8+
Cages. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rashid G. Siddique
- School of Chemistry and Molecular Biosciences The University of Queensland St Lucia Qld 4072 Australia
- Department of Chemistry School of Natural Sciences (SNS) National University of Science and Technology (NUST), H-12 Islamabad 46000 Pakistan
| | - Kasun S. A. Arachchige
- School of Chemistry and Molecular Biosciences The University of Queensland St Lucia Qld 4072 Australia
| | - Hydar A. AL‐Fayaad
- School of Chemistry and Molecular Biosciences The University of Queensland St Lucia Qld 4072 Australia
| | - John D. Thoburn
- Department of Chemistry Randolph-Macon College Ashland VA 23005 USA
| | - John C. McMurtrie
- School of Chemistry and Physics and Centre for Materials Science Queensland University of Technology (QUT) Brisbane Queensland 4000 Australia
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences The University of Queensland St Lucia Qld 4072 Australia
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19
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Chakraborty D, Saha R, Clegg JK, Mukherjee PS. Selective separation of planar and non-planar hydrocarbons using an aqueous Pd 6 interlocked cage. Chem Sci 2022; 13:11764-11771. [PMID: 36320911 PMCID: PMC9580621 DOI: 10.1039/d2sc04660a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Accepted: 09/13/2022] [Indexed: 11/23/2022] Open
Abstract
Polycyclic aromatic hydrocarbons (PAHs) find multiple applications ranging from fabric dyes to optoelectronic materials. Hydrogenation of PAHs is often employed for their purification or derivatization. However, separation of PAHs from their hydrogenated analogues is challenging because of their similar physical properties. An example of such is the separation of 9,10-dihydroanthracene from phenanthrene/anthracene which requires fractional distillation at high temperature (∼340 °C) to obtain pure anthracene/phenanthrene in coal industry. Herein we demonstrate a new approach for this separation at room temperature using a water-soluble interlocked cage (1) as extracting agent by host–guest chemistry. The cage was obtained by self-assembly of a triimidazole donor L·HNO3 with cis-[(tmeda)Pd(NO3)2] (M) [tmeda = N,N,N′,N′-tetramethylethane-1,2-diamine]. 1 has a triply interlocked structure with an inner cavity capable of selectively binding planar aromatic guests. We report here a triply interlocked cage with the ability to encapsulate planar guests in aqueous medium. This property was then employed to efficiently separate planar and non-planar aromatic hydrocarbons by aqueous extraction.![]()
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Affiliation(s)
- Debsena Chakraborty
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Rupak Saha
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Partha Sarathi Mukherjee
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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20
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Xu L, Xie Z, Zenere KA, Clegg JK, Kenny E, Rijs NJ, Jameson GNL, Kepert CJ, Powell BJ, Neville SM. Co-existence of five- and six-coordinate iron( ii) species captured in a geometrically strained spin-crossover Hofmann framework. Dalton Trans 2022; 51:9596-9600. [DOI: 10.1039/d2dt01371a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The use of an angular ligand drives the formation of an irregular Hofmann framework whereby 6-coordinate and rare 5-coordinate FeII species co-exist – the 6-coordinate species show a spin-crossover transition.
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Affiliation(s)
- Luonan Xu
- School of Chemistry, The University of New South Wales, Sydney, New South Wales, 2052, Australia
| | - Zixi Xie
- School of Chemistry, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Katrina A. Zenere
- School of Chemistry, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Elise Kenny
- School of School of Mathematics and Physics, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Nicole J. Rijs
- School of Chemistry, The University of New South Wales, Sydney, New South Wales, 2052, Australia
| | - Guy N. L. Jameson
- School of Chemistry, Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, 30 Flemington Road, Parkville, Victoria 3010, Australia
| | - Cameron J. Kepert
- School of Chemistry, The University of Sydney, Sydney, New South Wales, 2006, Australia
| | - Benjamin J. Powell
- School of School of Mathematics and Physics, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Suzanne M. Neville
- School of Chemistry, The University of New South Wales, Sydney, New South Wales, 2052, Australia
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21
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Siddique RG, Arachchige KSA, Al-Fayaad HA, Thoburn JD, McMurtrie JC, Clegg JK. Controlling the Complexity and Interconversion Mechanisms in Self-Assembled [Fe 2 L 3 ] 4+ Helicates and [Fe 4 L 6 ] 8+ Cages. Angew Chem Int Ed Engl 2021; 61:e202115555. [PMID: 34897921 DOI: 10.1002/anie.202115555] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Indexed: 11/06/2022]
Abstract
Self-assembled coordination cages and metal-organic frameworks have relied extensively on symmetric ligands in their formation. Here we have prepared a relatively simple system employing an unsymmetric ligand that results in two distinct self-assembled structures, a [Fe2 L3 ]4+ helicate and a [Fe4 L6 ]8+ cage composed of 10 interconverting diastereomers and their enantiomers. We show that the steric profile of the ligand controls the complexity, thermodynamics and kinetics of interconversion of the system.
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Affiliation(s)
- Rashid G Siddique
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld 4072, Australia.,Department of Chemistry, School of Natural Sciences (SNS), National University of Science and Technology (NUST), H-12, Islamabad, 46000, Pakistan
| | - Kasun S A Arachchige
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld 4072, Australia
| | - Hydar A Al-Fayaad
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld 4072, Australia
| | - John D Thoburn
- Department of Chemistry, Randolph-Macon College, Ashland, VA 23005, USA
| | - John C McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Qld 4072, Australia
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22
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Forster LC, Clegg JK, Cheney KL, Garson MJ. Expanding the Repertoire of Spongian-16-One Derivatives in Australian Nudibranchs of the Genus Goniobranchus and Evaluation of Their Anatomical Distribution. Mar Drugs 2021; 19:680. [PMID: 34940679 PMCID: PMC8706817 DOI: 10.3390/md19120680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/24/2021] [Accepted: 11/25/2021] [Indexed: 11/21/2022] Open
Abstract
Extracts of the mantle and viscera of the Indo-Pacific nudibranchs Goniobranchus aureopurpureus and Goniobranchus sp. 1 afforded 11 new diterpenoids (1-11), all of which possess a tetracyclic spongian-16-one scaffold with extensive oxidation at C-6, C-7, C-11, C-12, C-13, and/or C-20. The structures and relative configuration were investigated by NMR experiments, while X-ray crystallography provided the absolute configuration of 1, including a 2'S configuration for the 2-methylbutanoate substituent located at C-7. Dissection of animal tissue revealed that the mantle and viscera tissues differed in their metabolite composition with diterpenes 1-11 present in the mantle tissue of the two nudibranch species.
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Affiliation(s)
- Louise C. Forster
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia; (L.C.F.); (J.K.C.)
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia; (L.C.F.); (J.K.C.)
| | - Karen L. Cheney
- School of Biological Sciences, The University of Queensland, St. Lucia, QLD 4072, Australia;
| | - Mary J. Garson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia; (L.C.F.); (J.K.C.)
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23
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Bakro A, Sharp-Bucknall L, Poynder TB, Clegg JK, Wilson DJD, Dutton JL. Lewis acid activation of Weiss' reagents ([PhI(Pyr) 2] 2+) with boranes and isolation of [PhI(4-DMAP)] 2. Chem Commun (Camb) 2021; 57:12163-12166. [PMID: 34726208 DOI: 10.1039/d1cc04725f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstraction of a pyridine ligand from Weiss' reagent ([PhI(Pyr)2]2+) using BF3-Et2O was found to activate Weiss' reagent towards electrophilic aromatic substitution reactions. The activated species can be isolated when 4-DMAP is used as the pyridine ligand and was determined to be [PhI(4-DMAP)]2+ in solution. The isolated cation was reactive in electrophilic aromatic substitution reactions towards mesitylene, xylene and toluene that Weiss' reagent itself does not react with.
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Affiliation(s)
- Aseel Bakro
- Department of Chemistry and Physics, La Trobe University, Melbourne 3086, Victoria, Australia.
| | - Lachlan Sharp-Bucknall
- Department of Chemistry and Physics, La Trobe University, Melbourne 3086, Victoria, Australia.
| | - Tiffany B Poynder
- Department of Chemistry and Physics, La Trobe University, Melbourne 3086, Victoria, Australia.
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - David J D Wilson
- Department of Chemistry and Physics, La Trobe University, Melbourne 3086, Victoria, Australia.
| | - Jason L Dutton
- Department of Chemistry and Physics, La Trobe University, Melbourne 3086, Victoria, Australia.
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24
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Abstract
The discovery of molecular single crystals that display interesting elastic behaviour has generated excitement regarding their potential applications as it has upended the common perception of crystals as brittle objects. In order to design new functional materials based on molecular crystals, a comprehensive understanding of how these materials respond to deformation on a molecular-level is required. An introduction to the underlying mechanical theory and how it may be applied to single crystals is provided, along with a comprehensive discussion on how these mechanical properties can be characterised. While this field has already presented a large number of elastically flexible crystals, there is a lack of detailed mechanical characterisation data and some contention regarding the atomic-scale mechanism of elasticity. Due to the discrepancies and contradictions between theories proposed in the literature, it is not yet understood why some crystals are elastic while others shatter under applied force. To dispel ambiguity and guide future research, a set of criteria are proposed to define an elastically flexible crystal, so that these materials may find applications among future technologies.
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Affiliation(s)
- Amy J Thompson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Analia I Chamorro Orué
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Akshay Jayamohanan Nair
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Jason R Price
- Australian Synchrotron, ANSTO - Melbourne, 800 Blackburn Rd, Clayton, VIC, 3168, Australia.
| | - John McMurtrie
- School of Chemistry and Physics, Faculty of Science and Engineering, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. .,Centre for Materials Science, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 2001, Australia
| | - Jack K Clegg
- Australian Synchrotron, ANSTO - Melbourne, 800 Blackburn Rd, Clayton, VIC, 3168, Australia.
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25
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Narbutas PT, Pierens GK, Clegg JK, Garson MJ. Oxygenated Sesquiterpenes From the Indo-Pacific Nudibranch Ardeadoris rubroannulata: Structure Revision of Pu’ulenal. Nat Prod Commun 2021. [DOI: 10.1177/1934578x211055025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Seven oxygenated sesquiterpenes 1 to 7 each with a drimane framework were isolated from an organic extract of the nudibranch Ardeadoris rubroannulata collected from Eastern Australia. The structure of pu’ulenal 2 was revised by 1D NOESY, providing a 9Z configuration, while isopu’ulenal 3 has the 9 E configuration previously ascribed to pu’ulenal.
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Affiliation(s)
- Patrick T. Narbutas
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Gregory K. Pierens
- Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
| | - Mary J. Garson
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Australia
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26
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Thompson AJ, Price JR, McMurtrie JC, Clegg JK. The mechanism of bending in co-crystals of caffeine and 4-chloro-3-nitrobenzoic acid. Nat Commun 2021; 12:5983. [PMID: 34671030 PMCID: PMC8528856 DOI: 10.1038/s41467-021-26204-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 08/18/2021] [Indexed: 11/16/2022] Open
Affiliation(s)
- Amy J Thompson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Jason R Price
- ANSTO Melbourne, The Australian Synchrotron, 800 Blackburn Rd, Clayton, VIC, 3168, Australia
| | - John C McMurtrie
- School of Chemistry and Physics, Faculty of Science and Engineering, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD, 4000, Australia. .,Centre for Materials Science, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD, 4000, Australia.
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD, 4072, Australia.
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27
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Tania, Poynder TB, Kaur A, Barwise L, Houston SD, Nair AJ, Clegg JK, Wilson DJD, Dutton JL. PhICl 2 is activated by chloride ions. Dalton Trans 2021; 50:11986-11991. [PMID: 34378593 DOI: 10.1039/d1dt02565a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A study on the potential activating role of pyridine in the electrophilic chlorination of anisole by PhICl2 has led to the discovery that soluble sources of chloride ions activate PhICl2 in the reaction at catalytic loadings, greatly increasing the rate of chlorination. It is further shown that presence of chloride increases the rate of decomposition of PhICl2 into PhI and Cl2. The specific mechanism by which chloride induces electrophilic chlorination and decomposition of PhICl2 remains an open question.
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Affiliation(s)
- Tania
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Tiffany B Poynder
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Aishvaryadeep Kaur
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Lachlan Barwise
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Sevan D Houston
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Akshay J Nair
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - David J D Wilson
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
| | - Jason L Dutton
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia.
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28
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Kołodziejski M, Brock AJ, Kurpik G, Walczak A, Li F, Clegg JK, Stefankiewicz AR. Charge Neutral [Cu 2L 2] and [Pd 2L 2] Metallocycles: Self-Assembly, Aggregation, and Catalysis. Inorg Chem 2021; 60:9673-9679. [PMID: 34114797 DOI: 10.1021/acs.inorgchem.1c00967] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A range of morphologically distinct metallosupramolecular Cu(II) and Pd(II) complexes has been constructed, based on the tritopic ligand 1,1',1″-(benzene-1,3,5-triyl)tris(4,4-dimethylpentane-1,3-dione) (H3L). By control of the reaction conditions, it is possible to generate distinct coordination assemblies possessing either macrocyclic or polymeric structures and more importantly distinct activity in catalysis of the Suzuki-Miyaura cross-coupling.
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Affiliation(s)
- Michał Kołodziejski
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.,Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, 61-614 Poznań, Poland
| | - Aidan J Brock
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Gracjan Kurpik
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.,Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, 61-614 Poznań, Poland
| | - Anna Walczak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.,Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, 61-614 Poznań, Poland
| | - Feng Li
- School of Science, Western Sydney University, Locked Bag 1797, Penrith New South Wales 2751, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia 4072, Queensland, Australia
| | - Artur R Stefankiewicz
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.,Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, 61-614 Poznań, Poland
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29
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Whittaker JJ, Brock AJ, Grosjean A, Pfrunder MC, McMurtrie JC, Clegg JK. Comment on "Trimorphs of 4-bromophenyl 4-bromobenzoate. Elastic, brittle, plastic" by S. Saha and G. R. Desiraju, Chem. Commun., 2018, 54, 6348. Chem Commun (Camb) 2021; 57:4974-4975. [PMID: 33870973 DOI: 10.1039/d0cc07668f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A re-refinement of the published but chemically implausible, crystal structure of "Form III" of 4-bromophenyl 4-bromobenzoate shows that it is not a polymorph, but instead a co-crystal containing both 4-bromophenyl 4-bromobenzoate (≈25%) and likely 4-bromophenyl 4-nitrobenzoate (≈75%).
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Affiliation(s)
- Jacob J Whittaker
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia. .,University of Groningen, Groningen Biomolecular Sciences and Biotechnology Institute, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Aidan J Brock
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia. .,School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
| | - Arnaud Grosjean
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia. .,National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, Republic of China
| | - Michael C Pfrunder
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia. .,School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
| | - John C McMurtrie
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia.
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30
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Poynder TB, Chamorro Orué AI, Tania, Sharp-Bucknall L, Flynn MT, Wilson DJD, Athukorala Arachchige KS, Clegg JK, Dutton JL. On the activation of PhICl 2 with pyridine. Chem Commun (Camb) 2021; 57:4970-4973. [PMID: 33881069 DOI: 10.1039/d1cc01567b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
It has been previously proposed that pyridines can activate PhICl2 by displacing a chloride and forming the [PhI(Pyr)(Cl)]+ cation as a reactive intermediate. Here we show that pyridine does not displace chloride, but rather forms a weak complex with the iodine via halogen bonding along the C-I bond axis. This interaction is interrogated by NMR, structural, charge density, and theoretical investigations, which all indicate that pyridine does not activate PhICl2 as proposed.
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Affiliation(s)
- Tiffany B Poynder
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, 3086, Australia.
| | - Analia I Chamorro Orué
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia.
| | - Tania
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, 3086, Australia.
| | - Lachlan Sharp-Bucknall
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, 3086, Australia.
| | - Matthew T Flynn
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, 3086, Australia.
| | - David J D Wilson
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, 3086, Australia.
| | | | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia.
| | - Jason L Dutton
- Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, 3086, Australia.
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31
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Siddique RG, Arachchige KSA, Al-Fayaad HA, Brock AJ, Micallef AS, Luis ET, Thoburn JD, McMurtrie JC, Clegg JK. The kinetics and mechanism of interconversion within a system of [Fe 2L 3] 4+ helicates and [Fe 4L 6] 8+ cages. Chem Commun (Camb) 2021; 57:4918-4921. [PMID: 33870998 DOI: 10.1039/d1cc01583d] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Nature builds simple molecules into highly complex assemblies, which are involved in all fundamental processes of life. Some of the most intriguing biological assemblies are those that can be precisely reconfigured to achieve different functions using the same building blocks. Understanding the reconfiguration of synthetic self-assembled systems will allow us to better understand the complexity of proteins and design useful artificial chemical systems. Here we have prepared a relatively simple system in which two distinct self-assembled structures, a [Fe2L3]4+ helicate and a [Fe4L6]8+ cage that are formed from the same precursors, coexist at equilibrium. We have measured the rates of interconversion of these two species and propose a mechanism for the transformation.
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Affiliation(s)
- Rashid G Siddique
- School of Chemistry and Molecular Biosciences, The University of Queensland St Lucia, Qld, 4072, Australia.
| | - Kasun S A Arachchige
- School of Chemistry and Molecular Biosciences, The University of Queensland St Lucia, Qld, 4072, Australia.
| | - Hydar A Al-Fayaad
- School of Chemistry and Molecular Biosciences, The University of Queensland St Lucia, Qld, 4072, Australia.
| | - Aidan J Brock
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - Aaron S Micallef
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - Ena T Luis
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - John D Thoburn
- Department of Chemistry, Randolph-Macon College, Ashland, VA 23005, USA
| | - John C McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology (QUT), Brisbane, Queensland 4000, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland St Lucia, Qld, 4072, Australia.
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32
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Brock AJ, Etchells IM, Moore EG, Clegg JK. Dinuclear triple stranded phenyl-spaced 1,3-bis-β-diketonato lanthanide(iii) complexes: synthesis, structures and spectroscopy. Dalton Trans 2021; 50:4874-4879. [PMID: 33877184 DOI: 10.1039/d1dt00393c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and crystal structures of a series of Ln(iii) (Ln = Gd, Nd, Yb as well as Y) complexes of a bis-β-diketone ligand incorporating a 1,3-substituted phenyl ring between its two β-diketone domains (1,1'-(1,3-phenylene)bis(4,4-dimethylpentane-1,3-dione), H2L1) is reported. The crystal structures show the complexes are seven coordinate in the solid state with the general formula [Ln2L13(solvent)2]. The photophysical properties of the complexes were explored in both solution and the solid state, which show an increase in coordination number in solution.
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Affiliation(s)
- A J Brock
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD, Australia 4072.
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33
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Craze AR, Zenno H, Pfrunder MC, McMurtrie JC, Hayami S, Clegg JK, Li F. Supramolecular Modulation of Spin Crossover in an Fe(II) Dinuclear Triple Helicate. Inorg Chem 2021; 60:6731-6738. [DOI: 10.1021/acs.inorgchem.1c00553] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander R. Craze
- School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Hikaru Zenno
- Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, Japan
| | - Michael C. Pfrunder
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia
- Centre for Materials Science, Queensland University of Technology, 2 George St, Brisbane, QLD 4001, Australia
| | - John C. McMurtrie
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4001, Australia
- Centre for Materials Science, Queensland University of Technology, 2 George St, Brisbane, QLD 4001, Australia
| | - Shinya Hayami
- Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, Japan
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia
| | - Feng Li
- School of Science, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
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34
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Brennan AT, Zenere KA, Kepert CJ, Clegg JK, Neville SM. Three Distinct Spin-Crossover Pathways in Halogen-Appended 2D Hofmann Frameworks. Inorg Chem 2021; 60:3871-3878. [DOI: 10.1021/acs.inorgchem.0c03651] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ashley T. Brennan
- The School of Chemistry, University of New South Wales—Sydney, Sydney 2052, New South Wales, Australia
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia 4072, Queensland, Australia
| | - Katrina A. Zenere
- The School of Chemistry, University of New South Wales—Sydney, Sydney 2052, New South Wales, Australia
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia 4072, Queensland, Australia
| | - Cameron J. Kepert
- The School of Chemistry, University of New South Wales—Sydney, Sydney 2052, New South Wales, Australia
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia 4072, Queensland, Australia
| | - Jack K. Clegg
- The School of Chemistry, University of New South Wales—Sydney, Sydney 2052, New South Wales, Australia
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia 4072, Queensland, Australia
| | - Suzanne M. Neville
- The School of Chemistry, University of New South Wales—Sydney, Sydney 2052, New South Wales, Australia
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia 4072, Queensland, Australia
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35
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Ezzedinloo L, Zenere KA, Xie Z, Ahmed M, Scottwell S, Bhadbhade M, Brand HEA, Clegg JK, Hua C, Sciortino NF, Parker LC, Powell BJ, Kepert CJ, Neville SM. Hierarchical Spin-Crossover Cooperativity in Hybrid 1D Chains of Fe II -1,2,4-Triazole Trimers Linked by [Au(CN) 2 ] - Bridges. Chemistry 2021; 27:5136-5141. [PMID: 33543525 DOI: 10.1002/chem.202100358] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Indexed: 11/11/2022]
Abstract
Foremost, practical applications of spin-crossover (SCO) materials require control of the nature of the spin-state coupling. In existing SCO materials, there is a single, well-defined dimensionality relevant to the switching behavior. A new material, consisting of 1,2,4-triazole-based trimers coordinated into 1D chains by [Au(CN)2 ]- and spaced by anions and exchangeable guests, underwent SCO defined by elastic coupling across multiple dimensional hierarchies. Detailed structural, vibrational, and theoretical studies conclusively confirmed that intra-trimer coupling was an order of magnitude greater than the intramolecular coupling, which was an order of magnitude greater than intermolecular coupling. As such, a clear hierarchy on the nature of elastic coupling in SCO materials was ascertained for the first time, which is a necessary step for the technological development of molecular switching materials.
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Affiliation(s)
- Lida Ezzedinloo
- The School of Chemistry, The University of New South Wales, Sydney, 2052, Australia
| | - Katrina A Zenere
- The School of Chemistry, The University of Sydney, Sydney 2006, Australia
| | - Zixi Xie
- The School of Chemistry, The University of New South Wales, Sydney, 2052, Australia
| | - Manan Ahmed
- The School of Chemistry, The University of New South Wales, Sydney, 2052, Australia
| | - SynØve Scottwell
- The School of Chemistry, The University of New South Wales, Sydney, 2052, Australia
| | - Mohan Bhadbhade
- Mark Wainwright Analytical Centre, The University of New South Wales, Sydney 2052, Australia
| | - Helen E A Brand
- Australian Synchrotron, ANSTO Clayton, Victoria, 3800, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, 4072, Australia
| | - Carol Hua
- School of Chemistry, The University of Melbourne, Parkville, 3010, Australia
| | | | - Lachlan C Parker
- School of Mathematics and Physics, The University of Queensland, St Lucia, 4072, Australia
| | - Benjamin J Powell
- School of Mathematics and Physics, The University of Queensland, St Lucia, 4072, Australia
| | - Cameron J Kepert
- The School of Chemistry, The University of Sydney, Sydney 2006, Australia
| | - Suzanne M Neville
- The School of Chemistry, The University of New South Wales, Sydney, 2052, Australia
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36
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Ahmed M, Brand HEA, Peterson VK, Clegg JK, Kepert CJ, Price JR, Powell BJ, Neville SM. Dual-supramolecular contacts induce extreme Hofmann framework distortion and multi-stepped spin-crossover. Dalton Trans 2021; 50:1434-1442. [PMID: 33438683 DOI: 10.1039/d0dt04007j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
An extended nitro-functionalised 1,2,4-triazole ligand has been used to induce considerable lattice distortion in a 2-D Hofmann framework material via competing supramolecular interactions. Single crystal X-ray diffraction analyses on [Fe3(N-cintrz)6(Pd(CN)4)3]·6H2O (N-cintrz: (E)-3-(2-nitrophenyl)acrylaldehyde) reveal a substantial deviation from a regular Hofmann structure, in particular as the intra- and inter-layer contacts are dominated by hydrogen-bonding interactions rather than the typical π-stacking arrays. Also, the 2-D Hofmann layers show an assortment of ligand conformations and local FeII coordination environments driven by the optimisation of competing supramolecular contacts. Temperature-dependent magnetic susceptibility measurements reveal a two-step spin crossover (SCO) transition. Variable temperature structural analyses show that the two crystallographically distinct FeII centres, which are arranged in stripes (2 : 1 ratio) within each Hofmann layer, undergo a cooperative HS ↔ HS/LS ↔ LS (HS = high spin, LS = low spin) transition without periodic spin-state ordering. The mismatch between crystallographic (2 : 1) and spin-state (1 : 1) periodicity at the HS : LS step provides key insight into the competition (frustration) between elastic interactions and crystallographically driven order.
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Affiliation(s)
- Manan Ahmed
- School of Chemistry, The University of New South Wales, Sydney, 2052, Australia.
| | - Helen E A Brand
- The Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria, Australia
| | | | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Cameron J Kepert
- The School of Chemistry, The University of Sydney, Sydney, 2006, Australia
| | - Jason R Price
- School of Chemistry, The University of New South Wales, Sydney, 2052, Australia. and The Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria, Australia
| | - Benjamin J Powell
- School of Mathematics and Physics, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Suzanne M Neville
- School of Chemistry, The University of New South Wales, Sydney, 2052, Australia.
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37
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Thompson AJ, Worthy A, Grosjean A, Price JR, McMurtrie JC, Clegg JK. Determining the mechanisms of deformation in flexible crystals using micro-focus X-ray diffraction. CrystEngComm 2021. [DOI: 10.1039/d1ce00401h] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A newly developed methodology allows for the determination of the mechanisms of deformation in flexible crystals with atomic precision. With broader applications, mapping experiments have wide reaching potential within the field of materials science.
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Affiliation(s)
- Amy J. Thompson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Anna Worthy
- School of Chemistry and Physics, Faculty of Science, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
| | - Arnaud Grosjean
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
- National Synchrotron Radiation Research Centre, Hsinchu 30076, Taiwan
| | - Jason R. Price
- Australian Synchrotron, ANSTO – Melbourne, 800 Blackburn Rd, Clayton, VIC, 3168, Australia
| | - John C. McMurtrie
- School of Chemistry and Physics, Faculty of Science, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia
- Centre for Materials Science, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 2001, Australia
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
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38
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Shi X, León F, Sim Y, Quek S, Hum G, Khoo YXJ, Ng ZX, Par MY, Ong HC, Singh VK, Ganguly R, Clegg JK, Díaz J, García F. N‐Bridged Acyclic Trimeric Poly‐Cyclodiphosphazanes: Highly Tuneable Cyclodiphosphazane Building Blocks. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008214] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xiaoyan Shi
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
- School of Materials and Energy Guangdong University of Technology Guangzhou 510006 Guangdong P. R. China
| | - Felix León
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Ying Sim
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Shina Quek
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Gavin Hum
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Yi Xin Joycelyn Khoo
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Zi Xuan Ng
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Mian Yang Par
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - How Chee Ong
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Varun K. Singh
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
| | - Rakesh Ganguly
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
- Department of Chemistry Shiv Nadar University NH91, Tehsil Dadri Gautam Buddha Nagard 201314 Uttar Pradesh India
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences The University of Queensland Cooper Road St Lucia 4072 Queensland Australia
| | - Jesús Díaz
- Departamento de Química Orgánica e Inorgánica Facultad de Veterinaria Universidad de Extremadura Avda de la Universidad s/n 10003 Cáceres Spain
| | - Felipe García
- School of Physical and Mathematical Science Division of Chemistry and Biological Chemistry Nanyang Technological University 21 Nanyang Link 637371 Singapore
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39
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Bhandary S, Thompson AJ, McMurtrie JC, Clegg JK, Ghosh P, Mangalampalli SRNK, Takamizawa S, Chopra D. The mechanism of bending in a plastically flexible crystal. Chem Commun (Camb) 2020; 56:12841-12844. [PMID: 32968742 DOI: 10.1039/d0cc05904h] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Mechanically adaptable molecular crystals have potential applications in flexible smart materials and devices. Here, we report the mechanism of plastic deformation in single crystals of a small organic molecule (N-(4-ethynylphenyl)-3-fluoro-4-(trifluoromethyl)benzamide) that can be repeatedly irreversibly bent and returned to its original shape without concomitant delamination or loss of integrity. Along with the quantification of the crystals' local and bulk mechanical properties (hardness, indentation modulus and Young's modulus), micro-focus synchrotron X-ray diffraction mapping show that upon deformation, molecular layers lined with trifluoromethyl groups cooperatively slip past one another resulting in their impressive plastic malleability.
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Affiliation(s)
- Subhrajyoti Bhandary
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India.
| | - Amy J Thompson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia QLD 4072, Australia.
| | - John C McMurtrie
- School of Chemistry and Physics, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia and Centre for Materials Science, Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia QLD 4072, Australia.
| | - Peuli Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India.
| | - S R N Kiran Mangalampalli
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, India
| | - Satoshi Takamizawa
- Department of Materials System Science, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa 236-0027, Japan
| | - Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India.
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40
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Kim S, Ryu H, Clegg JK, Lindoy LF, Lee SS. Exocyclic Coordination of Thiamacrocycles Leading to cis- and trans-Palladium(II) Complexes and a Tripalladium(II) Complex Incorporating Acetimidic Anhydride. Inorg Chem 2020; 59:15807-15812. [DOI: 10.1021/acs.inorgchem.0c02258] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Seulgi Kim
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
| | - Hyunsoo Ryu
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Leonard F. Lindoy
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Shim Sung Lee
- Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, South Korea
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41
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Howlader P, Bhandari P, Chakraborty D, Clegg JK, Mukherjee PS. Self-Assembly of a Pd8 Macrocycle and Pd12 Homochiral Tetrahedral Cages Using Poly(tetrazolate) Linkers. Inorg Chem 2020; 59:15454-15459. [DOI: 10.1021/acs.inorgchem.0c02452] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Prodip Howlader
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Pallab Bhandari
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Debsena Chakraborty
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland—St. Lucia, St. Lucia, Queensland 4072, Australia
| | - Partha Sarathi Mukherjee
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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42
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Brennan AT, Zenere KA, Brand HEA, Price JR, Bhadbhade MM, Turner GF, Moggach SA, Valverde-Muñoz FJ, Real JA, Clegg JK, Kepert CJ, Neville SM. Guest Removal and External Pressure Variation Induce Spin Crossover in Halogen-Functionalized 2-D Hofmann Frameworks. Inorg Chem 2020; 59:14296-14305. [DOI: 10.1021/acs.inorgchem.0c02092] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ashley T. Brennan
- The School of Chemistry, UNSW Sydney, Sydney 2052, New South Wales, Australia
| | - Katrina A. Zenere
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
| | | | - Jason R. Price
- The School of Chemistry, UNSW Sydney, Sydney 2052, New South Wales, Australia
- Australian Synchrotron, ANSTO, Clayton 3800, Victoria, Australia
| | - Mohan M. Bhadbhade
- Mark Wainwright Analytical Centre, UNSW Sydney, Sydney, New South Wales 2052, Australia
| | - Gemma F. Turner
- School of Molecular Sciences/Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth 6009, Western Australia, Australia
| | - Stephen A. Moggach
- School of Molecular Sciences/Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth 6009, Western Australia, Australia
| | - Francisco J. Valverde-Muñoz
- Institut the Ciencia Molecular, Department de Quimica Inorganica, Universitat de Valéncia, 46980 Paterna, Valéncia, Spain
| | - Jose A. Real
- Institut the Ciencia Molecular, Department de Quimica Inorganica, Universitat de Valéncia, 46980 Paterna, Valéncia, Spain
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - Cameron J. Kepert
- The School of Chemistry, The University of Sydney, Sydney 2006, New South Wales, Australia
| | - Suzanne M. Neville
- The School of Chemistry, UNSW Sydney, Sydney 2052, New South Wales, Australia
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43
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Shi X, León F, Sim Y, Quek S, Hum G, Khoo YXJ, Ng ZX, Par MY, Ong HC, Singh VK, Ganguly R, Clegg JK, Díaz J, García F. N-Bridged Acyclic Trimeric Poly-Cyclodiphosphazanes: Highly Tuneable Cyclodiphosphazane Building Blocks. Angew Chem Int Ed Engl 2020; 59:22100-22108. [PMID: 32696527 DOI: 10.1002/anie.202008214] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/16/2020] [Indexed: 01/15/2023]
Abstract
We have synthesized a completely new family of acyclic trimeric cyclodiphosphazane compounds comprising NH, Ni Pr, Nt Bu and NPh bridging groups. In addition, the first NH-bridged acyclic dimeric cyclophosphazane has been produced. The trimeric species display highly tuneable characteristics so that the distance between the terminal N(H)R moieties can be readily modulated by the steric bulk present in the bridging groups (ranging from ≈6 to ≈10 Å). Moreover, these species exhibit pronounced topological changes when a weak non-bonding NH⋅⋅⋅π aryl interaction is introduced. Finally, the NH-bridged chloride binding affinities have been calculated and benchmarked along with the existing experimental data available for monomeric cyclodiphosphazanes. Our results underscore these species as promising hydrogen bond donors for supramolecular host-guest applications.
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Affiliation(s)
- Xiaoyan Shi
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore.,School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, Guangdong, P. R. China
| | - Felix León
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Ying Sim
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Shina Quek
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Gavin Hum
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Yi Xin Joycelyn Khoo
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Zi Xuan Ng
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Mian Yang Par
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - How Chee Ong
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Varun K Singh
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
| | - Rakesh Ganguly
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore.,Department of Chemistry, Shiv Nadar University, NH91, Tehsil Dadri, Gautam Buddha Nagard, 201314, Uttar Pradesh, India
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Cooper Road, St Lucia, 4072, Queensland, Australia
| | - Jesús Díaz
- Departamento de Química Orgánica e Inorgánica, Facultad de Veterinaria Universidad de Extremadura, Avda de la Universidad s/n, 10003, Cáceres, Spain
| | - Felipe García
- School of Physical and Mathematical Science, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21, Nanyang Link, 637371, Singapore
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44
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Kieffer M, Bilbeisi RA, Thoburn JD, Clegg JK, Nitschke JR. Guest Binding Drives Host Redistribution in Libraries of Co II 4 L 4 Cages. Angew Chem Int Ed Engl 2020; 59:11369-11373. [PMID: 32243707 PMCID: PMC7383889 DOI: 10.1002/anie.202004627] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Indexed: 12/29/2022]
Abstract
Two CoII 4 L4 tetrahedral cages prepared from similar building blocks showed contrasting host-guest properties. One cage did not bind guests, whereas the second encapsulated a series of anions, due to electronic and geometric effects. When the building blocks of both cages were present during self-assembly, a library of five CoII LA x LB 4-x cages was formed in a statistical ratio in the absence of guests. Upon incorporation of anions able to interact preferentially with some library members, the products obtained were redistributed in favor of the best anion binders. To quantify the magnitudes of these templation effects, ESI-MS was used to gauge the effect of each template upon library redistribution.
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Affiliation(s)
- Marion Kieffer
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
| | - Rana A. Bilbeisi
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
- Department of Civil and Environmental EngineeringAmerican University of BeirutBeirutLebanon
| | - John D. Thoburn
- Department of ChemistryRandolph-Macon CollegeAshlandVA23005USA
| | - Jack K. Clegg
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
- School of Chemistry and Molecular BiosciencesThe University of QueenslandSt LuciaQLD4072Australia
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45
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Doheny PW, Clegg JK, Tuna F, Collison D, Kepert CJ, D'Alessandro DM. Quantification of the mixed-valence and intervalence charge transfer properties of a cofacial metal-organic framework via single crystal electronic absorption spectroscopy. Chem Sci 2020; 11:5213-5220. [PMID: 34122977 PMCID: PMC8159307 DOI: 10.1039/d0sc01521k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Gaining a fundamental understanding of charge transfer mechanisms in three-dimensional Metal-Organic Frameworks (MOFs) is crucial to the development of electroactive and conductive porous materials. These materials have potential in applications in porous conductors, electrocatalysts and energy storage devices; however the structure-property relationships pertaining to charge transfer and its quantification are relatively poorly understood. Here, the cofacial Cd(ii)-based MOF [Cd(BPPTzTz)(tdc)]·2DMF (where BPPTzTz = 2,5-bis(4-(pyridin-4-yl)phenyl)thiazolo[5,4-d]thiazole, tdc2- = 2,5-thiophene dicarboxylate) exhibits Intervalence Charge Transfer (IVCT) within its three-dimensional structure by virtue of the close, cofacial stacking of its redox-active BPPTzTz ligands. The mixed-valence and IVCT properties are characterised using a combined electrochemical, spectroelectrochemical and computational approach. Single crystal electronic absorption spectroscopy was employed to obtain the solid-state extinction coefficient, enabling the application of Marcus-Hush theory. The electronic coupling constant, H ab, of 145 cm-1 was consistent with the localised mixed-valence properties of both this framework and analogous systems that use alternative methods to obtain the H ab parameter. This work demonstrates the first report of the successful characterisation of IVCT in a MOF material using single crystal electronic absorption spectroscopy and serves as an attractive alternative to more complex methods due to its simplicity and applicability.
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Affiliation(s)
- Patrick W Doheny
- School of Chemistry, The University of Sydney New South Wales 2006 Australia +61 2 93513777
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland St Lucia Queensland 4072 Australia
| | - Floriana Tuna
- Department of Chemistry and Photon Science Institute, The University of Manchester Manchester M13 9PL UK
| | - David Collison
- Department of Chemistry and Photon Science Institute, The University of Manchester Manchester M13 9PL UK
| | - Cameron J Kepert
- School of Chemistry, The University of Sydney New South Wales 2006 Australia +61 2 93513777
| | - Deanna M D'Alessandro
- School of Chemistry, The University of Sydney New South Wales 2006 Australia +61 2 93513777
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46
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Forster LC, Pierens GK, Clegg JK, Garson MJ. Dynamic NMR and Computational Studies Inform the Conformational Description of Dendrillane Terpenes from the Nudibranch Goniobranchus coi. J Nat Prod 2020; 83:714-719. [PMID: 31913035 DOI: 10.1021/acs.jnatprod.9b01051] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two new oxygenated terpenes (1 and 2) have been characterized from the Australian nudibranch Goniobranchus coi. Broadened 1H NMR signals, together with the absence of individual carbon NMR signals, complicated analysis of 5,9-epoxydendrillolide A (1); increasing the temperature to 323 K revealed the missing NMR signals. Low-temperature 1H NMR experiments provided an activation barrier of ∼15 kcal mol-1 and, together with DFT calculations, supported interconversion of a twist chair conformer with two different chair conformers. X-ray crystallographic analysis coupled with biosynthetic reasoning suggested a (5R, 8S, 9R, 13R, 14R, 15R, 16R) configuration. Ketone 2 demonstrated similar dynamic conformational processes to 1.
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Affiliation(s)
- Louise C Forster
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Gregory K Pierens
- Centre for Advanced Imaging, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Jack K Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Mary J Garson
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
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47
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AL-Fayaad HA, Athukorala Arachchige KS, Clegg JK. A heterofunctional ligand approach for the preparation of high connectivity coordination polymers: combining a “bridge” and “pillar” in one ligand. CrystEngComm 2020. [DOI: 10.1039/d0ce01020k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new strategy that combines the design elements of reticular synthesis and pillaring is proposed.
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Affiliation(s)
- Hydar A. AL-Fayaad
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St Lucia
- Australia
| | | | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St Lucia
- Australia
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48
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Setter CJ, Whittaker JJ, Brock AJ, Athukorala Arachchige KS, McMurtrie JC, Clegg JK, Pfrunder MC. Correction: Straightening out halogen bonds. CrystEngComm 2020. [DOI: 10.1039/d0ce90107e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for ‘Straightening out halogen bonds’ by Caitlin J. Setter et al., CrystEngComm, 2020, 22, 1687–1690, DOI: 10.1039/D0CE00176G.
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Affiliation(s)
- Caitlin J. Setter
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St Lucia
- Australia
| | - Jacob J. Whittaker
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St Lucia
- Australia
| | - Aidan J. Brock
- School of Chemistry and Physics
- Queensland University of Technology
- Brisbane
- Australia
| | | | - John C. McMurtrie
- School of Chemistry and Physics
- Queensland University of Technology
- Brisbane
- Australia
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St Lucia
- Australia
| | - Michael C. Pfrunder
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St Lucia
- Australia
- School of Chemistry and Physics
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49
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Klenner MA, Zhang B, Ciancaleoni G, Howard JK, Maynard-Casely HE, Clegg JK, Massi M, Fraser BH, Pascali G. Rhenium(i) complexation–dissociation strategy for synthesising fluorine-18 labelled pyridine bidentate radiotracers. RSC Adv 2020; 10:8853-8865. [PMID: 35496512 PMCID: PMC9049978 DOI: 10.1039/d0ra00318b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 02/10/2020] [Indexed: 01/23/2023] Open
Abstract
A novel fluorine-18 radiolabelling method employing rhenium(i) mediation is described herein. In less than 1 minute, fluorine-18 labelled complexes and ligands were synthesised in greater than 80% and 60% radiochemical yields (RCY), respectively.
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Affiliation(s)
- Mitchell A. Klenner
- Human Health & National Deuteration Facility
- Australian Nuclear Science and Technology Organisation (ANSTO)
- Australia
- School of Molecular and Life Sciences
- Curtin University
| | - Bo Zhang
- School of Chemistry
- Monash University
- Melbourne
- Australia
| | | | - James K. Howard
- Human Health & National Deuteration Facility
- Australian Nuclear Science and Technology Organisation (ANSTO)
- Australia
| | - Helen E. Maynard-Casely
- Human Health & National Deuteration Facility
- Australian Nuclear Science and Technology Organisation (ANSTO)
- Australia
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences
- The University of Queensland
- St. Lucia
- Australia
| | | | - Benjamin H. Fraser
- Human Health & National Deuteration Facility
- Australian Nuclear Science and Technology Organisation (ANSTO)
- Australia
| | - Giancarlo Pascali
- Human Health & National Deuteration Facility
- Australian Nuclear Science and Technology Organisation (ANSTO)
- Australia
- Brain and Mind Centre
- The University of Sydney
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50
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AL-Fayaad HA, Siddique RG, Arachchige KSA, Clegg JK. A Two-Dimensional Coordination Polymer Formed from Cobalt(II) and an Extended Dipyridyl Ligand. Aust J Chem 2020. [DOI: 10.1071/ch19468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The synthesis of the extended dipyridyl ligand 4,4′-(2,5-dimethyl-1,4-phenylene)dipyridine (L) in an improved yield via the palladium catalysed Suzuki coupling of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (1) and 1,4-dibromo-2,5-dimethylbenzene (2) is reported along with its use to form a two-dimensional coordination polymer [Co2L2(OAc)4(H2O)2]n. The coordination polymer consists of one-dimensional chains of octahedral cobalt ions bridged by acetate ligands which are connected to form two dimensional sheets with square lattice (sql) topology via the dipyridyl ligands (L). The structure contains small voids totalling ~6.6% of the unit cell volume. The crystal structures 1, L, L·2H2O, and L·2HNO3 are also reported.
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