1
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Meekel EG, Schmidt EM, Cameron LJ, Dharma AD, Windsor HJ, Duyker SG, Minelli A, Pope T, Lepore GO, Slater B, Kepert CJ, Goodwin AL. Truchet-tile structure of a topologically aperiodic metal-organic framework. Science 2023; 379:357-361. [PMID: 36701437 DOI: 10.1126/science.ade5239] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
When tiles decorated to lower their symmetry are joined together, they can form aperiodic and labyrinthine patterns. Such Truchet tilings offer an efficient mechanism of visual data storage related to that used in barcodes and QR codes. We show that the crystalline metal-organic framework [OZn4][1,3-benzenedicarboxylate]3 (TRUMOF-1) is an atomic-scale realization of a complex three-dimensional Truchet tiling. Its crystal structure consists of a periodically arranged assembly of identical zinc-containing clusters connected uniformly in a well-defined but disordered fashion to give a topologically aperiodic microporous network. We suggest that this unusual structure emerges as a consequence of geometric frustration in the chemical building units from which it is assembled.
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Affiliation(s)
- Emily G Meekel
- Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, UK
| | - Ella M Schmidt
- Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, UK.,Fachbereich Geowissenschaften, Universität Bremen, D-28359 Bremen, Germany
| | - Lisa J Cameron
- School of Chemistry, University of Sydney, New South Wales 2006, Australia
| | - A David Dharma
- School of Chemistry, University of Sydney, New South Wales 2006, Australia
| | - Hunter J Windsor
- School of Chemistry, University of Sydney, New South Wales 2006, Australia
| | - Samuel G Duyker
- School of Chemistry, University of Sydney, New South Wales 2006, Australia.,Sydney Analytical, Core Research Facilities, University of Sydney, New South Wales 2006, Australia
| | - Arianna Minelli
- Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, UK
| | - Tom Pope
- Department of Chemistry, University College London, London WC1H 0AJ, UK
| | | | - Ben Slater
- Department of Chemistry, University College London, London WC1H 0AJ, UK
| | - Cameron J Kepert
- School of Chemistry, University of Sydney, New South Wales 2006, Australia
| | - Andrew L Goodwin
- Inorganic Chemistry Laboratory, University of Oxford, Oxford OX1 3QR, UK
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2
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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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3
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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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4
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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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5
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Kepert CJ, Windsor H, Lewis W, Neville SM, Duyker S, D'Alessandro DM. Two-step spin crossover by guest-disorder induced local symmetry breaking within a 3D Hofmann-like framework. Chem Commun (Camb) 2022; 58:13127-13130. [DOI: 10.1039/d2cc03780g] [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] [Indexed: 11/21/2022]
Abstract
A 3D Hofmann-like metal–organic framework has been prepared which contains a 2,1,3-benzothiadiazole-based pillaring ligand. Encapsulation of a polycyclic aromatic hydrocarbon, chrysene, within the pore structure leads to a new pathway...
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6
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Doheny PW, Hua C, Chan B, Tuna F, Collison D, Kepert CJ, D'Alessandro DM. Substituent effects on through-space intervalence charge transfer in cofacial metal-organic frameworks. Faraday Discuss 2021; 231:152-167. [PMID: 34251000 DOI: 10.1039/d1fd00021g] [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
Electroactive metal-organic frameworks (MOFs) are an attractive class of materials owing to their multifunctional 3-dimensional structures, the properties of which can be modulated by changing the redox states of the components. In order to realise both fundamental and applied goals for these materials, a deeper understanding of the structure-function relationships that govern the charge transfer mechanisms is required. Chemical or electrochemical reduction of the framework [Zn(BPPFTzTz)(tdc)]·2DMF, hereafter denoted ZnFTzTz (where BPPFTzTz = 2,5-bis(3-fluoro-4-(pyridin-4-yl)phenyl)thiazolo[5,4-d]thiazole), generates mixed-valence states with optical signatures indicative of through-space intervalence charge transfer (IVCT) between the cofacially stacked ligands. Fluorination of the TzTz ligands influences the IVCT band parameters relative to the unsubstituted parent system, as revealed through Marcus-Hush theory analysis and single crystal UV-Vis spectroscopy. Using a combined experimental, theoretical and density functional theory (DFT) analysis, important insights into the effects of structural modifications, such as ligand substitution, on the degree of electronic coupling and rate of electron transfer have been obtained.
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Affiliation(s)
- Patrick W Doheny
- School of Chemistry, The University of Sydney, New South Wales, 2006 Australia.
| | - Carol Hua
- School of Chemistry, The University of Sydney, New South Wales, 2006 Australia. .,School of Chemistry, The University of Melbourne, Victoria, 3010 Australia
| | - Bun Chan
- Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
| | - 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.
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7
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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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8
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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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9
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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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10
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Ahmed M, Xie Z, Thoonen S, Hua C, Kepert CJ, Price JR, Neville SM. A new spin crossover Fe II coordination environment in a two-fold interpenetrated 3-D Hofmann-type framework material. Chem Commun (Camb) 2021; 57:85-88. [PMID: 33245087 DOI: 10.1039/d0cc07326a] [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: 12/27/2022]
Abstract
A 3-D FeII Hofmann-type framework material has been prepared which contains a three-connecting pyridyl-donor ligand with amide functionality and [Au(CN)2]- metallo-ligands. The FeII sites display a rare FeII(py)3(N[triple bond, length as m-dash]C)3 coordination environment, which we show for the first time to be conducive to spin crossover (SCO).
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Affiliation(s)
- Manan Ahmed
- School of Chemistry, The University of New South Wales, Sydney, 2052, Australia.
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11
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Ding B, Chan B, Proschogo N, Solomon MB, Kepert CJ, D'Alessandro DM. A cofacial metal-organic framework based photocathode for carbon dioxide reduction. Chem Sci 2021; 12:3608-3614. [PMID: 34163634 PMCID: PMC8179387 DOI: 10.1039/d0sc04691d] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 01/02/2021] [Indexed: 11/21/2022] Open
Abstract
Innovative and robust photosensitisation materials play a cardinal role in advancing the combined effort towards efficient solar energy harvesting. Here, we demonstrate the photocathode functionality of a Metal-Organic Framework (MOF) featuring cofacial pairs of photo- and electro-active 1,4,5,8-naphthalenediimide (NDI) ligands, which was successfully applied to markedly reduce the overpotential required for CO2 reduction to CO by a well-known rhenium molecular electrocatalyst. Reduction of [Cd(DPNDI)(TDC)] n (DPNDI = N,N'-di(4-pyridyl)-1,4,5,8-naphthalenediimide, H2TDC = thiophene-2,5-dicarboxylic acid) to its mixed-valence state induces through-space Intervalence Charge Transfer (IVCT) within cofacial DPNDI units. Irradiation of the mixed-valence MOF in the visible region generates a DPNDI photoexcited radical monoanion state, which is stabilised as a persistent species by the inherent IVCT interactions and has been rationalised using Density Functional Theory (DFT). This photoexcited radical monoanion state was able to undergo charge transfer (CT) reduction of the rhenium molecular electrocatalyst to effect CO generation at a lower overpotential than that required by the discrete electrocatalyst itself. The exploitation of cofacial MOFs opens new directions for the design philosophy behind light harvesting materials.
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Affiliation(s)
- Bowen Ding
- School of Chemistry, The University of Sydney Sydney New South Wales 2006 Australia +61 3 9351 3329 +61 2 9351 3777
| | - Bun Chan
- Graduate School of Engineering, Nagasaki University Bunkyo 1-14, Nagasaki-shi Nagasaki 852-8521 Japan
| | - Nicholas Proschogo
- School of Chemistry, The University of Sydney Sydney New South Wales 2006 Australia +61 3 9351 3329 +61 2 9351 3777
| | - Marcello B Solomon
- School of Chemistry, The University of Sydney Sydney New South Wales 2006 Australia +61 3 9351 3329 +61 2 9351 3777
| | - Cameron J Kepert
- School of Chemistry, The University of Sydney Sydney New South Wales 2006 Australia +61 3 9351 3329 +61 2 9351 3777
| | - Deanna M D'Alessandro
- School of Chemistry, The University of Sydney Sydney New South Wales 2006 Australia +61 3 9351 3329 +61 2 9351 3777
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12
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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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13
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Zappe L, Schönfeld S, Hörner G, Zenere KA, Leong CF, Kepert CJ, D'Alessandro DM, Weber B, Neville SM. Spin crossover modulation in a coordination polymer with the redox-active bis-pyridyltetrathiafulvalene (py 2TTF) ligand. Chem Commun (Camb) 2020; 56:10469-10472. [PMID: 32766630 DOI: 10.1039/d0cc03788e] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A one-dimensional FeII coordination polymer (CP) has been formed which includes the redox-active ligand bis-pyridyltetrathiafulvalene (py2TTF) and a Schiff base-like N2O2 ligand. This CP is both spin crossover (SCO) and redox-active in the solid-state, and chemical oxidation results in SCO modification.
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Affiliation(s)
- Lisa Zappe
- Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95448 Bayreuth, Germany.
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14
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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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15
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Zaiter S, Kirk C, Taylor M, Klein YM, Housecroft CE, Sciortino NF, Clements JE, Cooper RI, Kepert CJ, Neville SM. Heteroatom substitution effects in spin crossover dinuclear complexes. Dalton Trans 2019; 48:7337-7343. [PMID: 30882806 DOI: 10.1039/c8dt05010d] [Citation(s) in RCA: 5] [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: 11/21/2022]
Abstract
We probe the effect of heteroatom substitution on the spin crossover (SCO) properties of dinuclear materials of the type [Fe2(NCX)4(R-trz)5]·S (X = S, Se; S = solvent; R-trz = (E)-N-(furan-2-ylmethylene)-4H-1,2,4-triazol-4-amine (furtrz); (E)-N-(thiophen-2-ylmethylene)-4H-1,2,4-triazole-4-amine (thtrz)). For the furtrz family ([Fe2(NCX)4(furtrz)5]·furtrz·MeOH; X = S (furtrz-S) and X = Se (furtrz-Se)) gradual and incomplete one-step SCO transitions are observed (furtrz-S (T1/2 = 172 K) and furtrz-Se (T1/2 = 205 K)) and a structural evolution from [HS-HS] to [HS-LS] per dinuclear species. Contrasting this, within the thtrz family ([Fe2(NCX)4(thtrz)5]·4MeOH; X = S (thtrz-S) and X = Se (thtrz-Se)) more varied SCO transitions are observed, with thtrz-S being SCO-inactive (high spin) and thtrz-Se showing a rare complete two-step SCO transition (T1/2(1,2) = 170, 200 K) in which the FeII sites transition from [HS-HS] to [HS-LS] to [LS-LS] per dinuclear unit with no long range ordering of spin-states at the intermediate plateau. Detailed structure-function analyses have been conducted within this growing dinuclear family to rationalise these diverse spin-switching properties.
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Affiliation(s)
- Samantha Zaiter
- School of Chemistry, The University of Sydney, New South Wales 2006, Australia
| | - Charlotte Kirk
- Chemical Crystallography, Chemistry Research Laboratory, Mansfield Road, Oxford, UK
| | - Matthew Taylor
- School of Chemistry, UNSW Sydney, New South Wales 2052, Australia.
| | - Y Maximilian Klein
- Department of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, CH-4058, Switzerland
| | - Catherine E Housecroft
- Department of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, CH-4058, Switzerland
| | - Natasha F Sciortino
- School of Chemistry, The University of Sydney, New South Wales 2006, Australia
| | - John E Clements
- School of Chemistry, The University of Sydney, New South Wales 2006, Australia
| | - Richard I Cooper
- Chemical Crystallography, Chemistry Research Laboratory, Mansfield Road, Oxford, UK
| | - Cameron J Kepert
- School of Chemistry, The University of Sydney, New South Wales 2006, Australia
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16
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Mulrooney DZT, Clements JE, Ericsson DJ, Price JR, Kühne IA, Coles SJ, Kepert CJ, Keene TD. Phase Control of Ferromagnetic Copper(II) Carbonate Coordination Polymers through Reagent Concentration. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801041] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
| | | | | | - Jason R. Price
- ANSTO, Australian Synchrotron Clayton, Vic 3168 Australia
| | - Irina A. Kühne
- School of Chemistry University College Dublin Dublin 4 Ireland
| | - Simon J. Coles
- National Crystallography Service University of Southampton University Road, Highfield Southampton, SO17 1BJ UK
| | | | - Tony D. Keene
- School of Chemistry University College Dublin Dublin 4 Ireland
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17
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Clements JE, Airey PR, Ragon F, Shang V, Kepert CJ, Neville SM. Guest-Adaptable Spin Crossover Properties in a Dinuclear Species Underpinned by Supramolecular Interactions. Inorg Chem 2018; 57:14930-14938. [DOI: 10.1021/acs.inorgchem.8b02625] [Citation(s) in RCA: 23] [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)
- John E. Clements
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Peter R. Airey
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Florence Ragon
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Vivian Shang
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Cameron J. Kepert
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Suzanne M. Neville
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia
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18
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Ding B, Hua C, Kepert CJ, D'Alessandro DM. Influence of structure-activity relationships on through-space intervalence charge transfer in metal-organic frameworks with cofacial redox-active units. Chem Sci 2018; 10:1392-1400. [PMID: 30809356 PMCID: PMC6357700 DOI: 10.1039/c8sc01128a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [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: 03/09/2018] [Accepted: 10/28/2018] [Indexed: 11/21/2022] Open
Abstract
Understanding charge transfer in redox-active metal-organic frameworks (MOFs) is of fundamental importance given the potential of these materials to be used in myriad applications including porous conductors, electrocatalysts and battery materials, amongst others. An important challenge is quantifying the spectroscopic features of these materials in order to elucidate their charge transfer properties. Herein, two topologically related Zn(ii) and Cd(ii) frameworks, [Zn2(DPPTzTz)2(SDC)2] (1-Zn) and [Cd2(DPPTzTz)2(SDC)2] (2-Cd) (where DPPTzTz = 2,5-bis(4-(4-pyridinyl)phenyl)thiazolo[5,4-d]thiazole and SDC = selenophene-2,5-dicarboxylate), incorporating cofacially stacked pairs of redox-active DPPTzTz ligands are presented. The differences in the through-space intervalence charge transfer properties of the mixed-valence forms of the two frameworks generated upon solid state spectroelectrochemical reduction are quantified using Marcus-Hush theory. Further, charge transfer theory is applied to calculate electron mobilities in both extended framework systems. A larger electronic coupling constant, H ab, of 118 cm-1 corresponding to an electron mobility, k, of 6.02 × 108 s-1 was observed for the Zn(ii) analogue compared to the Cd(ii) analogue (H ab = 61.2 cm-1 and k = 2.22 × 108 s-1) and was correlated primarily with the larger cofacial stacking distance and increasingly offset stacking geometry between DPPTzTz ligands in the latter. Establishing structure-activity relationships in electroactive MOFs, in addition to methods for quantifying their charge transfer properties, represents an important advance in fine tuning solid state materials for device applications.
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Affiliation(s)
- Bowen Ding
- School of Chemistry , The University of Sydney , New South Wales , 2006 Australia . ;
| | - Carol Hua
- School of Chemistry , The University of Sydney , New South Wales , 2006 Australia . ;
| | - Cameron J Kepert
- School of Chemistry , The University of Sydney , New South Wales , 2006 Australia . ;
| | - Deanna M D'Alessandro
- School of Chemistry , The University of Sydney , New South Wales , 2006 Australia . ;
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19
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Zenere KA, Duyker SG, Trzop E, Collet E, Chan B, Doheny PW, Kepert CJ, Neville SM. Increasing spin crossover cooperativity in 2D Hofmann-type materials with guest molecule removal. Chem Sci 2018; 9:5623-5629. [PMID: 30061995 PMCID: PMC6048833 DOI: 10.1039/c8sc01040d] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [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: 03/05/2018] [Accepted: 05/28/2018] [Indexed: 11/25/2022] Open
Abstract
Ambient temperature spin crossover with wide hysteresis has been achieved in 2D Hofmann-type materials, where removal of guest molecules optimises ligand–ligand interactions, resulting in increased cooperativity.
Molecule-based spin state switching materials that display ambient temperature transitions with accompanying wide thermal hysteresis offer an opportunity for electronic switching, data storage, and optical technologies but are rare in existence. Here, we present the first 2D Hofmann-type materials to exhibit the elusive combination of ambient temperature spin crossover with wide thermal hysteresis (ΔT = 50 and 65 K). Combined structural, magnetic, spectroscopic, and theoretical analyses show that the highly cooperative transition behaviours of these layered materials arise due to strong host–host interactions in their interdigitated lattices, which optimises long-range communication pathways. With the presence of water molecules in the interlayer pore space in the hydrated phases, competing host–host and host–guest interactions occur, whilst water removal dramatically increases the framework cooperativity, thus affording systematic insight into the structural features that favour optimal spin crossover properties.
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Affiliation(s)
- Katrina A Zenere
- School of Chemistry , The University of Sydney , Sydney , New South Wales 2006 , Australia .
| | - Samuel G Duyker
- School of Chemistry , The University of Sydney , Sydney , New South Wales 2006 , Australia .
| | - Elzbieta Trzop
- Univ Rennes , CNRS , IPR (Institut de Physique de Rennes) - UMR 6251 , F-35000 Rennes , France
| | - Eric Collet
- Univ Rennes , CNRS , IPR (Institut de Physique de Rennes) - UMR 6251 , F-35000 Rennes , France
| | - Bun Chan
- Graduate School of Engineering , Nagasaki University , 1-14 Bunkyo-machi , Nagasaki-shi Nagasaki 852-8521 , Japan
| | - Patrick W Doheny
- School of Chemistry , The University of Sydney , Sydney , New South Wales 2006 , Australia .
| | - Cameron J Kepert
- School of Chemistry , The University of Sydney , Sydney , New South Wales 2006 , Australia .
| | - Suzanne M Neville
- School of Chemistry , The University of Sydney , Sydney , New South Wales 2006 , Australia . .,School of Chemistry , The University of New South Wales , Kensington , New South Wales 2052 , Australia .
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20
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Craze AR, Howard-Smith KJ, Bhadbhade MM, Mustonen O, Kepert CJ, Marjo CE, Li F. Investigation of the High-Temperature Spin-Transition of a Mononuclear Iron(II) Complex Using X-ray Photoelectron Spectroscopy. Inorg Chem 2018; 57:6503-6510. [DOI: 10.1021/acs.inorgchem.8b00576] [Citation(s) in RCA: 8] [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: 12/31/2022]
Affiliation(s)
- Alexander R. Craze
- School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, New South Wales 2751, Australia
| | - Kyle J. Howard-Smith
- School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, New South Wales 2751, Australia
| | - Mohan M. Bhadbhade
- Mark Wainwright Analytical Centre, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Outi Mustonen
- Mark Wainwright Analytical Centre, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Cameron J. Kepert
- School of Chemistry, University of Sydney, Sydney, New South Wales 2006, Australia
| | - Christopher E. Marjo
- Mark Wainwright Analytical Centre, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Feng Li
- School of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, New South Wales 2751, Australia
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21
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Hua C, Doheny PW, Ding B, Chan B, Yu M, Kepert CJ, D'Alessandro DM. Through-Space Intervalence Charge Transfer as a Mechanism for Charge Delocalization in Metal-Organic Frameworks. J Am Chem Soc 2018; 140:6622-6630. [PMID: 29727176 DOI: 10.1021/jacs.8b02638] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [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
Understanding the nature of charge transfer mechanisms in 3-dimensional metal-organic frameworks (MOFs) is an important goal owing to the possibility of harnessing this knowledge to design electroactive and conductive frameworks. These materials have been proposed as the basis for the next generation of technological devices for applications in energy storage and conversion, including electrochromic devices, electrocatalysts, and battery materials. After nearly two decades of intense research into MOFs, the mechanisms of charge transfer remain relatively poorly understood, and new strategies to achieve charge mobility remain elusive and challenging to experimentally explore, validate, and model. We now demonstrate that aromatic stacking interactions in Zn(II) frameworks containing cofacial thiazolo[5,4- d]thiazole (TzTz) units lead to a mixed-valence state upon electrochemical or chemical reduction. This through-space intervalence charge transfer (IVCT) phenomenon represents a new mechanism for charge transfer in MOFs. Computational modeling of the optical data combined with application of Marcus-Hush theory to the IVCT bands for the mixed-valence framework has enabled quantification of the degree of charge transfer using both in situ and ex situ electro- and spectro-electrochemical methods. A distance dependence for the through-space electron transfer has also been identified on the basis of experimental studies and computational calculations. This work provides a new window into electron transfer phenomena in 3-dimensional coordination space, of relevance to electroactive MOFs where new mechanisms for charge transfer are highly sought after, and to understanding biological light-harvesting systems where through-space mixed-valence interactions are operative.
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Affiliation(s)
- Carol Hua
- School of Chemistry , The University of Sydney , New South Wales 2006 , Australia
| | - Patrick W Doheny
- School of Chemistry , The University of Sydney , New South Wales 2006 , Australia
| | - Bowen Ding
- School of Chemistry , The University of Sydney , New South Wales 2006 , Australia
| | - Bun Chan
- Graduate School of Engineering , Nagasaki University , Nagasaki 852-8521 , Japan
| | - Michelle Yu
- School of Chemistry , The University of Sydney , New South Wales 2006 , Australia
| | - Cameron J Kepert
- School of Chemistry , The University of Sydney , New South Wales 2006 , Australia
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22
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Chastanet G, Sciortino NF, Neville SM, Kepert CJ. High Spin to Low Spin Relaxation Regime Change in a Multistep 3D Spin-Crossover Material. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Guillaume Chastanet
- CNRS; Université de Bordeaux, ICMCB; 87 avenue du Dr. A. Schweitzer F-33608 Pessac France
| | | | - Suzanne M. Neville
- School of Chemistry; The University of Sydney; 2006 Camperdown NSW Australia
| | - Cameron J. Kepert
- School of Chemistry; The University of Sydney; 2006 Camperdown NSW Australia
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23
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Mullaney BR, Goux-Capes L, Price DJ, Chastanet G, Létard JF, Kepert CJ. Spin crossover-induced colossal positive and negative thermal expansion in a nanoporous coordination framework material. Nat Commun 2017; 8:1053. [PMID: 29051479 PMCID: PMC5648752 DOI: 10.1038/s41467-017-00776-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [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: 12/14/2016] [Accepted: 07/27/2017] [Indexed: 11/23/2022] Open
Abstract
External control over the mechanical function of materials is paramount in the development of nanoscale machines. Yet, exploiting changes in atomic behaviour to produce controlled scalable motion is a formidable challenge. Here, we present an ultra-flexible coordination framework material in which a cooperative electronic transition induces an extreme abrupt change in the crystal lattice conformation. This arises due to a change in the preferred coordination character of Fe(II) sites at different spin states, generating scissor-type flexing of the crystal lattice. Diluting the framework with transition-inactive Ni(II) sites disrupts long-range communication of spin state through the lattice, producing a more gradual transition and continuous lattice movement, thus generating colossal positive and negative linear thermal expansion behaviour, with coefficients of thermal expansion an order of magnitude greater than previously reported. This study has wider implications in the development of advanced responsive structures, demonstrating electronic control over mechanical motion. Controlling mechanical motions in solid state devices is highly desirable for the development of nanoscale machines. Here, Kepert and colleagues exploit an ultra-flexible coordination framework in which thermally-controlled Fe(II) spin transitions result in remarkable flexing of the crystal lattice.
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Affiliation(s)
- Benjamin R Mullaney
- School of Chemistry, The University of Sydney, Building F11, Sydney, NSW, 2006, Australia
| | - Laurence Goux-Capes
- School of Chemistry, The University of Sydney, Building F11, Sydney, NSW, 2006, Australia
| | - David J Price
- School of Chemistry, The University of Sydney, Building F11, Sydney, NSW, 2006, Australia
| | - Guillaume Chastanet
- ICMCB, UPR CNRS 9048, Université Bordeaux I, 87 Av. du Doc. A., Schweitzer, F-33608, Pessac, France
| | - Jean-François Létard
- ICMCB, UPR CNRS 9048, Université Bordeaux I, 87 Av. du Doc. A., Schweitzer, F-33608, Pessac, France
| | - Cameron J Kepert
- School of Chemistry, The University of Sydney, Building F11, Sydney, NSW, 2006, Australia.
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24
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Li L, Neville SM, Craze AR, Clegg JK, Sciortino NF, Arachchige KSA, Mustonen O, Marjo CE, McRae CR, Kepert CJ, Lindoy LF, Aldrich-Wright JR, Li F. Spin-State Patterning in an Iron(II) Tripodal Spin-Crossover Complex. ACS Omega 2017; 2:3349-3353. [PMID: 31457658 PMCID: PMC6641455 DOI: 10.1021/acsomega.7b00630] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 06/23/2017] [Indexed: 06/10/2023]
Abstract
A mononuclear iron(II) complex that displays a gradual two-step spin-crossover (SCO) transition is reported. The intermediate plateau (IP) occurs between HS0.40LS0.60 and HS0.30LS0.70 (HS = high spin; LS = low spin) ratios over the region of ca. 190-170 K. A phase change occurs at the IP, breaking the symmetry, resulting in six independent SCO sites compared to one at the 100% HS and LS plateau regions, respectively. Variable-temperature X-ray photoelectron spectroscopy shows that the SCO behavior is completely reversible among the HS, IP, and LS regions. The results both confirm and extend the related results for the above system described by Halcrow et al. (Kulmaczewski R.; Cespedes O.; Halcrow M. A.Gradual Thermal Spin-Crossover Mediated By a Reentrant Z' = 1 → Z' = 6 → Z' = 1 Phase Transition, Inorg. Chem. 2017, 56, 3144-3148) in a recent report.
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Affiliation(s)
- Li Li
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
| | | | - Alexander R. Craze
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
| | - Jack K. Clegg
- School
of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
| | | | | | - Outi Mustonen
- Mark
Wainwright Analytical Centre, University
of New South Wales, Sydney, NSW 2052, Australia
| | - Christopher E. Marjo
- Mark
Wainwright Analytical Centre, University
of New South Wales, Sydney, NSW 2052, Australia
| | - Christopher R. McRae
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Cameron J. Kepert
- School
of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Leonard F. Lindoy
- School
of Chemistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Janice R. Aldrich-Wright
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
| | - Feng Li
- School
of Science and Health, Western Sydney University, Locked Bag 1797, Penrith, Sydney, NSW 2751, Australia
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25
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Abrahams BF, Dharma AD, Donnelly PS, Hudson TA, Kepert CJ, Robson R, Southon PD, White KF. Tunable Porous Coordination Polymers for the Capture, Recovery and Storage of Inhalation Anesthetics. Chemistry 2017; 23:7871-7875. [PMID: 28432702 DOI: 10.1002/chem.201700389] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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: 01/26/2017] [Indexed: 11/06/2022]
Abstract
The uptake of inhalation anesthetics by three topologically identical frameworks is described. The 3D network materials, which possess square channels of different dimensions, are formed from the relatively simple combination of ZnII centres and dianionic ligands that contain a phenolate and a carboxylate group at opposite ends. All three framework materials are able to adsorb N2 O, Xe and isoflurane. Whereas the framework with the widest channels is able to adsorb large quantities of the various guests from the gas phase, the frameworks with the narrower channels have superior binding enthalpies and exhibit higher levels of retention. The use of ligands in which substituents are bound to the aromatic rings of the bridging ligands offers great scope for tuning the adsorption properties of the framework materials.
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Affiliation(s)
- Brendan F Abrahams
- School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia
| | - A David Dharma
- School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Paul S Donnelly
- School of Chemistry and Bio21 Molecular Science Institute, Biotechnology Institute, University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Timothy A Hudson
- School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia
| | | | - Richard Robson
- School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Peter D Southon
- School of Chemistry, University of Sydney, NSW, 2006, Australia
| | - Keith F White
- School of Chemistry, University of Melbourne, Parkville, Victoria, 3010, Australia
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26
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Murphy MJ, Zenere KA, Ragon F, Southon PD, Kepert CJ, Neville SM. Guest Programmable Multistep Spin Crossover in a Porous 2-D Hofmann-Type Material. J Am Chem Soc 2017; 139:1330-1335. [DOI: 10.1021/jacs.6b12465] [Citation(s) in RCA: 142] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Michael J. Murphy
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Katrina A. Zenere
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Florence Ragon
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Peter D. Southon
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Cameron J. Kepert
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Suzanne M. Neville
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
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27
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Roxburgh MAD, Zaiter S, Hudson XIB, Mullaney BR, Clements JE, Moubaraki B, Murray KS, Neville SM, Kepert CJ. Structure and Magnetic Studies on a Series of Two-Dimensional Iron(II) Framework Materials with Varying Ligand Characteristics. Aust J Chem 2017. [DOI: 10.1071/ch16586] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Targeting the general (4,4)-grid structural motif, we have prepared seven new coordination polymers in the general family [Fe(NCX)2(L)2]·(guest) (L = bis-pyridyl-type bridging ligands; X = S, Se) as an extension of the well-established spin crossover framework (SCOF) family. In all cases, the (4,4)-grid topology is formed by the bridging of octahedral iron(ii) sites in the equatorial plane by bis-pyridyl ligands of varying length, flexibility, and intermolecular interaction capacity. In particular, the six ligands n-(4-pyridyl)-isonicotinamide (pin), trans-1,2-bis(4′-pyridyl)ethane (tvp), 1,2-dibromo-1,2-bis(4′-pyridyl)ethane (dbbpe), bis(4-pyridyl)-1,2,4,5-tetrazine (bptz), 4,4′-bis(pyridyl)acetylene (bpac), and 1,4-bis(4-pyridylethynyl)benzene (bpeben) have been utilised. The seven new materials [Fe(NCS)2(pin)2]·2(MeCN) (pin-S), [Fe(tvp)2(NCS)2]·1/2(tvp)·(CH3CH2OH) (tvp-S), [Fe(dbbpe)2(NCS)2]·6(CH3CN) (dbbpe-S), [Fe(NCS)2(bptz)2]·2(CHCl3)·6(EtOH) (bptz-S), [Fe(NCSe)2(bptz)2]·4(CHCl3)·(EtOH)·(H2O) (bptz-Se), [Fe(NCS)2(bpac)2]·2(PrOH) (bpac-S), and [Fe(NCS)2(bpeben)2]·2(CHCl3) (bpeben-S) all form (4,4)-grids of varying size that are arranged in a parallel stacked topology. Despite being in the [FeN6] coordination environment known to be conducive to spin crossover, these materials all remain high-spin with thermal variation. These results are discussed in context with the large family of SCOFs that show varied spin crossover behaviours.
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28
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Caddy JS, Faust TB, Walton IM, Cox JM, Benedict JB, Solomon MB, Southon PD, Kepert CJ, D'Alessandro DM. Photoactive and Physical Properties of an Azobenzene-Containing Coordination Framework. Aust J Chem 2017. [DOI: 10.1071/ch17215] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A new three-dimensional coordination framework, [Zn4(tbazip)3(bpe)2(OH)2]·bpe·{solvent} (where bpe = 1,2-di(4-pyridyl)ethene) containing the novel photoactive ligand tbazip (tbazip = 5-((4-tert-butyl)phenylazo)isophthalic acid) has been synthesised and crystallographically characterised. The photoactivity of discrete tbazip was investigated and compared with its photoactivity while incorporated within the framework. The effect of isomerisation of the incorporated azobenzene on the chemical and physical properties of the framework were investigated using UV-vis and Raman spectroscopies. The framework is porous only to hydrogen gas at 77 K, but displayed an appreciable uptake for CO2 at 195 K.
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29
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Clements JE, Price JR, Neville SM, Kepert CJ. Hysteretic Four-Step Spin Crossover within a Three-Dimensional Porous Hofmann-like Material. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605418] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- John E. Clements
- School of Chemistry, University of Sydney; Sydney NSW 2006 Australia
| | - Jason R. Price
- Australian Synchrotron Company Limited; 800 Blackburn Road Clayton VIC 3168 Australia
| | | | - Cameron J. Kepert
- School of Chemistry, University of Sydney; Sydney NSW 2006 Australia
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30
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Clements JE, Price JR, Neville SM, Kepert CJ. Hysteretic Four-Step Spin Crossover within a Three-Dimensional Porous Hofmann-like Material. Angew Chem Int Ed Engl 2016; 55:15105-15109. [DOI: 10.1002/anie.201605418] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Indexed: 11/06/2022]
Affiliation(s)
- John E. Clements
- School of Chemistry, University of Sydney; Sydney NSW 2006 Australia
| | - Jason R. Price
- Australian Synchrotron Company Limited; 800 Blackburn Road Clayton VIC 3168 Australia
| | | | - Cameron J. Kepert
- School of Chemistry, University of Sydney; Sydney NSW 2006 Australia
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31
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Sciortino NF, Ragon F, Zenere KA, Southon PD, Halder GJ, Chapman KW, Piñeiro-López L, Real JA, Kepert CJ, Neville SM. Exploiting Pressure To Induce a "Guest-Blocked" Spin Transition in a Framework Material. Inorg Chem 2016; 55:10490-10498. [PMID: 27709915 DOI: 10.1021/acs.inorgchem.6b01686] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new functionalized 1,2,4-triazole ligand, 4-[(E)-2-(5-methyl-2-thienyl)vinyl]-1,2,4-triazole (thiome), was prepared to assess the broad applicability of strategically producing multistep spin transitions in two-dimensional Hofmann-type materials of the type [FeIIPd(CN)4(R-1,2,4-trz)2]·nH2O (R-1,2,4-trz = a 4-functionalized 1,2,4-triazole ligand). A variety of structural and magnetic investigations on the resultant framework material [FeIIPd(CN)4(thiome)2]·2H2O (A·2H2O) reveal that a high-spin (HS) to low-spin (LS) transition is inhibited in A·2H2O due to a combination of guest and ligand steric bulk effects. The water molecules can be reversibly removed with retention of the porous host framework and result in the emergence of an abrupt and hysteretic one-step spin transition due to the removal of guest internal pressure. A spin transition can, furthermore, be induced in A·2H2O (0-0.68 GPa) under hydrostatic pressure, as evidenced by variable-pressure structure and magnetic studies, resulting in a two-step spin transition at ambient temperatures at 0.68 GPa. The presence of a two-step spin crossover (SCO) in A·2H2O under hydrostatic pressure compared to a one-step SCO in A at ambient pressure is discussed in terms of the relative ability of each phase to accommodate mixed HS/LS states according to differing lattice flexibilities.
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Affiliation(s)
- Natasha F Sciortino
- School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia
| | - Florence Ragon
- 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
| | - Peter D Southon
- School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia
| | - Gregory J Halder
- X-ray Science Division, Advanced Photon Source (APS), Argonne National Laboratory , Lemont, Illinois 60439, United States
| | - Karena W Chapman
- X-ray Science Division, Advanced Photon Source (APS), Argonne National Laboratory , Lemont, Illinois 60439, United States
| | - Lucía Piñeiro-López
- Institut the Ciencia Molecular, Universitat de València , 46980 Paterna, València, Spain
| | - José A Real
- Institut the Ciencia Molecular, Universitat de València , 46980 Paterna, València, Spain
| | - Cameron J Kepert
- School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia
| | - Suzanne M Neville
- School of Chemistry, The University of Sydney , Sydney, New South Wales 2006, Australia
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32
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Sciortino NF, Zenere KA, Corrigan ME, Halder GJ, Chastanet G, Létard JF, Kepert CJ, Neville SM. Four-step iron(ii) spin state cascade driven by antagonistic solid state interactions. Chem Sci 2016; 8:701-707. [PMID: 28451220 PMCID: PMC5297924 DOI: 10.1039/c6sc03114e] [Citation(s) in RCA: 68] [Impact Index Per Article: 8.5] [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: 07/14/2016] [Accepted: 09/11/2016] [Indexed: 11/21/2022] Open
Abstract
A rare four-step spin crossover transition has been attained in a two-dimensional Hofmann-type material through the presence of an array of antagonistic host–host and host–guest interactions.
A four-stepped cascade of Fe(ii) high spin (HS) to low spin (LS) states is demonstrated in a family of 2-D Hofmann materials, [Fe3II(saltrz)6(MII(CN)4)3]·8(H2O) (MII = Pd (1Pd), Pt (1Pt); saltrz = (E)-2-(((4H-1,2,4-triazol-4-yl)imino)methyl)phenol). Alongside the fully HS and LS Fe(ii) states, fractional spin state stabilization occurs at HS/LS values of 5/6, 2/3, and 1/6. This unconventional spin state periodicity is driven by the presence of multiple spin crossover (SCO) active Fe(ii) sites which are in subtly distinct environments driven by a network of antagonistic host–host and host–guest interactions. Alternating long- and short-range magnetostructural ordering is achieved over the five distinct spin state ratios HS1.0LS0.0, HS0.833LS0.167, HS0.667LS0.333, HS0.167LS0.833, and HS0.0LS1.0 owing to the flexibility of this 2-D interdigitated lattice topology interconnected by intermolecular interactions. A distinct wave-like spin state patterning is structurally evidenced for each intermediate phase.
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Affiliation(s)
- Natasha F Sciortino
- School of Chemistry , The University of Sydney , NSW 2006 , Australia . ; Tel: +61-2-9351-7791
| | - Katrina A Zenere
- School of Chemistry , The University of Sydney , NSW 2006 , Australia . ; Tel: +61-2-9351-7791
| | - Maggie E Corrigan
- School of Chemistry , The University of Sydney , NSW 2006 , Australia . ; Tel: +61-2-9351-7791
| | - Gregory J Halder
- X-ray Science Division , Advanced Photon Source , Argonne National Laboratory , IL 60439 , USA
| | | | | | - Cameron J Kepert
- School of Chemistry , The University of Sydney , NSW 2006 , Australia . ; Tel: +61-2-9351-7791
| | - Suzanne M Neville
- School of Chemistry , The University of Sydney , NSW 2006 , Australia . ; Tel: +61-2-9351-7791
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33
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Miller RG, Southon PD, Kepert CJ, Brooker S. Commensurate CO2 Capture, and Shape Selectivity for HCCH over H2CCH2, in Zigzag Channels of a Robust CuI(CN)(L) Metal–Organic Framework. Inorg Chem 2016; 55:6195-200. [DOI: 10.1021/acs.inorgchem.6b00813] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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)
- Reece G. Miller
- Department of Chemistry
and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
| | - Peter D. Southon
- School of Chemistry, The University of Sydney, Camperdown, New South Wales 2006, Australia
| | - Cameron J. Kepert
- School of Chemistry, The University of Sydney, Camperdown, New South Wales 2006, Australia
| | - Sally Brooker
- Department of Chemistry
and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago,
P.O. Box 56, Dunedin 9054, New Zealand
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34
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Lennartson A, Southon P, Sciortino NF, Kepert CJ, Frandsen C, Mørup S, Piligkos S, McKenzie CJ. Reversible Guest Binding in a Non-Porous Fe(II) Coordination Polymer Host Toggles Spin Crossover. Chemistry 2015; 21:16066-72. [PMID: 26394897 DOI: 10.1002/chem.201502547] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [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: 06/30/2015] [Indexed: 11/09/2022]
Abstract
Formation of either a dimetallic compound or a 1 D coordination polymer of adiponitrile adducts of [Fe(bpte)](2+) (bpte=[1,2-bis(pyridin-2-ylmethyl)thio]ethane) can be controlled by the choice of counteranion. The iron(II) atoms of the bis(adiponitrile)-bridged dimeric complex [Fe2 (bpte)2 (μ2 -(NC(CH2 )4 CN)2 ](SbF6 )4 (2) are low spin at room temperature, as are those in the polymeric adiponitrile-linked acetone solvate polymer {[Fe(bpte)(μ2 -NC(CH2 )4 CN)](BPh4 )2 ⋅Me2 CO} (3⋅Me2 CO). On heating 3⋅Me2 CO to 80 °C, the acetone is abruptly removed with an accompanying purple to dull lavender colour change corresponding to a conversion to a high-spin compound. Cooling reveals that the desolvate 3 shows hysteretic and abrupt spin crossover (SCO) S=0↔S=2 behaviour centred at 205 K. Non-porous 3 can reversibly absorb one equivalent of acetone per iron centre to regenerate the same crystalline phase of 3⋅Me2 CO concurrently reinstating a low-spin state.
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Affiliation(s)
- Anders Lennartson
- Current address: Department of Chemistry and Chemical Engineering, Chalmers Univeristy of Technology, 41296 Gothenburg (Sweden).,Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense M (Denmark)
| | - Peter Southon
- School of Chemistry, The University of Sydney, NSW 2006, Sydney (Australia)
| | | | - Cameron J Kepert
- School of Chemistry, The University of Sydney, NSW 2006, Sydney (Australia)
| | - Cathrine Frandsen
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby (Denmark)
| | - Steen Mørup
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby (Denmark)
| | - Stergios Piligkos
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen (Denmark)
| | - Christine J McKenzie
- Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, 5230 Odense M (Denmark).
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35
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Murphy MJ, Hua C, Price JR, D'Alessandro DM, Kepert CJ. Structures, Electrochemical and Spectral Properties of a Series of [MnN(CN)3(diimine)]-Complexes. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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36
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Rizzuto FJ, Hua C, Chan B, Faust TB, Rawal A, Leong CF, Hook JM, Kepert CJ, D'Alessandro DM. The electronic, optical and magnetic consequences of delocalization in multifunctional donor–acceptor organic polymers. Phys Chem Chem Phys 2015; 17:11252-9. [DOI: 10.1039/c5cp00081e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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
Redox reactions on electroactive donor–acceptor polymers can be used to tune their response to external magnetic and electrical stimuli.
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Affiliation(s)
| | - Carol Hua
- School of Chemistry
- The University of Sydney
- Australia
| | - Bun Chan
- School of Chemistry
- The University of Sydney
- Australia
| | | | - Aditya Rawal
- NMR Facility
- Mark Wainwright Analytical Centre
- The University of New South Wales
- Australia
| | | | - James M. Hook
- NMR Facility
- Mark Wainwright Analytical Centre
- The University of New South Wales
- Australia
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37
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Náfrádi B, Choucair M, Southon PD, Kepert CJ, Forró L. Strong interplay between the electron spin lifetime in chemically synthesized graphene multilayers and surface-bound oxygen. Chemistry 2014; 21:770-7. [PMID: 25394656 DOI: 10.1002/chem.201404309] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [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: 07/09/2014] [Indexed: 11/10/2022]
Abstract
The electron spin lifetime in an assembly of chemically synthesized graphene sheets was found to be extremely sensitive to oxygen. Introducing small concentrations of physisorbed O2 onto the graphene surface reduced the exceptionally long 140 ns electron spin lifetime by an order of magnitude. This effect was completely reversible: Removing the O2 by using a dynamic vacuum restored the spin lifetime. The presence of covalently bound oxygen also decreased the electron spin lifetime in graphene, although to a far lesser extent compared to physisorbed O2 . The conduction electrons in graphene were found to play a significant role by counter-balancing the spin depolarization caused by oxygen molecules. Our results highlight the importance of chemical environment control and device packing in practical graphene-based spintronic applications.
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Affiliation(s)
- Bálint Náfrádi
- Institute of Physics of Complex Matter EPFL, Lausanne (Switzerland).
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38
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Faust TB, Usov PM, D'Alessandro DM, Kepert CJ. Highly unusual interpenetration isomers of electroactive nickel bis(dithiolene) coordination frameworks. Chem Commun (Camb) 2014; 50:12772-4. [PMID: 25208497 DOI: 10.1039/c4cc05438e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [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 metalloligand [Ni(pedt)2](-) (pedt = 1-(pyridine-4-yl)ethylene-1,2-dithiolate) has been incorporated into two multi-dimensional structures for the first time. These coordination frameworks represent highly unusual interpenetration isomers and exhibit solid state redox and optical properties that reflect the electronically delocalised nature of the metalloligand.
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Affiliation(s)
- Thomas B Faust
- School of Chemistry, University of Sydney, NSW 2006, Australia.
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39
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Rizzuto FJ, Faust TB, Chan B, Hua C, D'Alessandro DM, Kepert CJ. Experimental and Computational Studies of a Multi-Electron Donor-Acceptor Ligand Containing the Thiazolo[5,4-d]thiazole Core and its Incorporation into a Metal-Organic Framework. Chemistry 2014; 20:17597-605. [DOI: 10.1002/chem.201405089] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Indexed: 11/08/2022]
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40
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Cowan MG, Miller RG, Southon PD, Price JR, Yazaydin O, Lane JR, Kepert CJ, Brooker S. Selective Gas Adsorption in a Pair of Robust Isostructural MOFs Differing in Framework Charge and Anion Loading. Inorg Chem 2014; 53:12076-83. [DOI: 10.1021/ic501876m] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Matthew G. Cowan
- Department of Chemistry
and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Reece G. Miller
- Department of Chemistry
and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Peter D. Southon
- School of Chemistry, The University of Sydney, Camperdown, NSW 2006, Australia
| | - Jason R. Price
- School of Chemistry, The University of Sydney, Camperdown, NSW 2006, Australia
| | - Ozgur Yazaydin
- Department of Chemical Engineering, University College London, London WC1E7JE, United Kingdom
| | - Joseph R. Lane
- Department of Chemistry, The University of Waikato, Private Bag
3105, Hamilton 3240, New Zealand
| | - Cameron J. Kepert
- School of Chemistry, The University of Sydney, Camperdown, NSW 2006, Australia
| | - Sally Brooker
- Department of Chemistry
and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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41
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Clements JE, Price JR, Neville SM, Kepert CJ. Perturbation of Spin Crossover Behavior by Covalent Post-Synthetic Modification of a Porous Metal-Organic Framework. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402951] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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42
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Clements JE, Price JR, Neville SM, Kepert CJ. Perturbation of Spin Crossover Behavior by Covalent Post-Synthetic Modification of a Porous Metal-Organic Framework. Angew Chem Int Ed Engl 2014; 53:10164-8. [DOI: 10.1002/anie.201402951] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 06/26/2014] [Indexed: 11/10/2022]
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43
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Sciortino NF, Neville SM, Létard JF, Moubaraki B, Murray KS, Kepert CJ. Thermal- and Light-Induced Spin-Crossover Bistability in a Disrupted Hofmann-Type 3D Framework. Inorg Chem 2014; 53:7886-93. [DOI: 10.1021/ic500323r] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [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)
- Natasha F. Sciortino
- School
of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Suzanne M. Neville
- School
of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Jean-François Létard
- Laboratoire
des Sciences Moléculaires, ICMCB (CNRS UPR 9048), Université Bordeaux I, 33608 Pessac, France
| | - Boujemaa Moubaraki
- School
of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Keith S. Murray
- School
of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Cameron J. Kepert
- School
of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
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44
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Sciortino NF, Neville SM, Desplanches C, Létard JF, Martinez V, Real JA, Moubaraki B, Murray KS, Kepert CJ. An Investigation of Photo- and Pressure-Induced Effects in a Pair of Isostructural Two-Dimensional Spin-Crossover Framework Materials. Chemistry 2014; 20:7448-57. [DOI: 10.1002/chem.201400367] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Indexed: 11/08/2022]
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45
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Wu Y, Peterson VK, Luks E, Darwish TA, Kepert CJ. Interpenetration as a Mechanism for Negative Thermal Expansion in the Metal-Organic Framework Cu3(btb)2(MOF-14). Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201311055] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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46
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Wu Y, Peterson VK, Luks E, Darwish TA, Kepert CJ. Interpenetration as a Mechanism for Negative Thermal Expansion in the Metal–Organic Framework Cu
3
(btb)
2
(MOF‐14). Angew Chem Int Ed Engl 2014; 53:5175-8. [DOI: 10.1002/anie.201311055] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Yue Wu
- School of Chemistry, The University of Sydney, Sydney NSW 2006 (Australia) sydney.edu.au/science/chemistry/∼cjkgroup/
| | - Vanessa K. Peterson
- Bragg Institute, Australian Nuclear Science & Technology Organisation (Australia)
| | - Emily Luks
- Bragg Institute, Australian Nuclear Science & Technology Organisation (Australia)
| | - Tamim A. Darwish
- Bragg Institute, Australian Nuclear Science & Technology Organisation (Australia)
| | - Cameron J. Kepert
- School of Chemistry, The University of Sydney, Sydney NSW 2006 (Australia) sydney.edu.au/science/chemistry/∼cjkgroup/
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47
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Reichel F, Clegg JK, Gloe K, Gloe K, Weigand JJ, Reynolds JK, Li CG, Aldrich-Wright JR, Kepert CJ, Lindoy LF, Yao HC, Li F. Self-Assembly of an Imidazolate-Bridged FeIII/CuII Heterometallic Cage. Inorg Chem 2014; 53:688-90. [DOI: 10.1021/ic402686s] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Florian Reichel
- School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia
- Department of Chemistry
and Food Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Jack K. Clegg
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane St. Lucia, QLD 4072, Australia
| | - Karsten Gloe
- Department of Chemistry
and Food Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Kerstin Gloe
- Department of Chemistry
and Food Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Jan J. Weigand
- Department of Chemistry
and Food Chemistry, TU Dresden, 01062 Dresden, Germany
| | - Jason K. Reynolds
- School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Chun-Guang Li
- School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia
| | - Janice R. Aldrich-Wright
- School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia
| | | | | | - Hong-Chang Yao
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan, P. R. China
| | - Feng Li
- School of Science and Health, University of Western Sydney, Locked Bag 1797, Penrith, NSW 2751, Australia
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48
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Klein YM, Sciortino NF, Ragon F, Housecroft CE, Kepert CJ, Neville SM. Spin crossover intermediate plateau stabilization in a flexible 2-D Hofmann-type coordination polymer. Chem Commun (Camb) 2014; 50:3838-40. [DOI: 10.1039/c4cc01079e] [Citation(s) in RCA: 72] [Impact Index Per Article: 7.2] [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 abrupt and hysteretic two-step spin crossover in a new triazole-based 2-D Hofmann-type complex shows a record breaking 120 K intermediate plateau (IP) region stabilized by negative cooperative interactions.
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Affiliation(s)
- Y. Maximilian Klein
- School of Chemistry
- The University of Sydney
- Sydney, 2006 Australia
- Department of Chemistry
- University of Basel
| | | | - Florence Ragon
- School of Chemistry
- The University of Sydney
- Sydney, 2006 Australia
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49
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Ragon F, Yaksi K, Sciortino NF, Chastanet G, Létard JF, D'Alessandro DM, Kepert CJ, Neville SM. Thermal Spin Crossover Behaviour of Two-Dimensional Hofmann-Type Coordination Polymers Incorporating Photoactive Ligands. Aust J Chem 2014. [DOI: 10.1071/ch14188] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Two spin crossover (SCO)-active 2D Hofmann-type framework materials, [Fe(3-PAP)2Pd(CN)4] (A) and [Fe(4-PAP)2Pd(CN)4] (B) containing the photoactive azo-benzene-type ligands 3-phenylazo-pyridine (3-PAP) and 4-phenylazo-pyridine (4-PAP) were prepared. These materials form non-porous Hofmann-type structures whereby 2D [FeIIPd(CN)4] grids are separated by 3- or 4-PAP ligands. The iron(ii) sites of both materials (A and B) undergo abrupt and hysteretic spin transitions with characteristic transition temperatures T1/2↓,↑: 178, 190 K (ΔT: 12 K) and T1/2↓,↑: 233, 250 K (ΔT: 17 K), respectively. Photo-magnetic characterisations reveal light-induced excited spin state trapping (LIESST) activity in both A and B with characteristic T(LIESST) values of 45 and 40 K. Although both free ligands show trans- to-cis isomerisation in solution under UV-irradiation, as evidenced via absorption spectroscopy, such photo-activity was not observed in the ligands or complexes A and B in the solid state. Structural analysis of a further non-SCO active isomer to B, [Fe(4-PAP)2Pd(CN)4]·1/2(4-PAP) (B·(4-PAP)), which contains free ligand in the pore space is reported.
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50
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Sundberg J, Cameron LJ, Southon PD, Kepert CJ, McKenzie CJ. Oxygen chemisorption/desorption in a reversible single-crystal-to-single-crystal transformation. Chem Sci 2014. [DOI: 10.1039/c4sc01636j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [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] Open
Abstract
A compound that can reversibly chemisorb O2 in the solid phase undergoes several consecutive single-crystal-to-single-crystal transformations involving the cleavage of four bonds and the creation of four new bonds, in one single molecule.
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Affiliation(s)
- Jonas Sundberg
- Department of Physics, Chemistry and Pharmacy
- University of Southern Denmark
- Campusvej 55
- 5230 Odense M, Denmark
| | | | | | | | - Christine J. McKenzie
- Department of Physics, Chemistry and Pharmacy
- University of Southern Denmark
- Campusvej 55
- 5230 Odense M, Denmark
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