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Tao YH, Schulke S, Schwaab G, Nealon GL, Pezzotti S, Hodgetts SI, Harvey AR, Havenith M, Wallace VP. Hydration water drives the self-assembly of guanosine monophosphate. Biophys J 2024; 123:931-939. [PMID: 38454599 PMCID: PMC11052693 DOI: 10.1016/j.bpj.2024.03.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 03/04/2024] [Accepted: 03/04/2024] [Indexed: 03/09/2024] Open
Abstract
Guanosine monophosphate (GMP) is a nucleotide that can self-assemble in aqueous solution under certain conditions. An understanding of the process at the molecular level is an essential step to comprehend the involvement of DNA substructures in transcription and replication, as well as their relationship to genetic diseases such as cancer. We present the temperature-dependent terahertz (1.5-12 THz, 50-400 cm-1) absorptivity spectra of aqueous Na2 GMP solution in comparison with the aqueous solutions of other RNA nucleotides. Distinct absorption features were observed in the spectrum of GMP, which we attribute to the intramolecular modes of the self-assemblies (i.e., G-complexes) that, at 1 M, start to form at 313 K and below. Changes in broad-band features of the terahertz spectrum were also observed, which we associate with the release of hydration water in the temperature-dependent formation of guanine quadruplexes. Using a state-of-the-art THz calorimetry approach correlating spectroscopic to thermodynamic changes, we propose a molecular mechanism of hydrophilic hydration driving GMP self-assembly as a function of temperature. The free energy contribution of hydrophilic hydration is shown as a decisive factor in guanine-quadruplex formation. Our findings spotlight the role of hydration in the formation of macromolecular structures and suggest the potential of hydration tuning for regulating DNA transcription and replication.
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Affiliation(s)
- Yu Heng Tao
- Department of Physics, The University of Western Australia, Crawley, WA, Australia
| | - Simon Schulke
- Department of Physical Chemistry II, Ruhr University Bochum, Bochum, Germany
| | - Gerhard Schwaab
- Department of Physical Chemistry II, Ruhr University Bochum, Bochum, Germany
| | - Gareth L Nealon
- School of Molecular Sciences, The University of Western Australia, Crawley, WA, Australia; Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA, Australia
| | - Simone Pezzotti
- Department of Physical Chemistry II, Ruhr University Bochum, Bochum, Germany
| | - Stuart I Hodgetts
- School of Human Sciences, The University of Western Australia, Crawley, WA, Australia; Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
| | - Alan R Harvey
- School of Human Sciences, The University of Western Australia, Crawley, WA, Australia; Perron Institute for Neurological and Translational Science, Nedlands, WA, Australia
| | - Martina Havenith
- Department of Physical Chemistry II, Ruhr University Bochum, Bochum, Germany.
| | - Vincent P Wallace
- Department of Physics, The University of Western Australia, Crawley, WA, Australia.
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2
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Gillespie AA, Roemer M, Jago D, Sobolev AN, Nealon GL, Spackman PR, Moggach SA, Koutsantonis GA. Functionalised organometallic photoswitches containing dihydropyrene units. Dalton Trans 2023; 52:14549-14563. [PMID: 37781908 DOI: 10.1039/d3dt02505e] [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: 10/03/2023]
Abstract
Functionalising organic molecular photoswitches with metal complexes has been shown to alter and enhance their switching states. These organometallic photoswitches provide a promising basis for novel smart molecular materials and molecular electronic devices. We have detailed the synthesis and characterisation of mono- and bimetallic half-sandwich ruthenium and iron complexes functionalised with alkynyl dihydropyrenes (DHP). Their electronic and photophysical properties were determined by the use of chemical, electrochemical and spectroelectrochemical techniques. The introduction of the metal alkynyl moiety allows access to additional redox and protonation states not accessible by the DHP alone. An additional metal alkynyl moiety inhibits observable photochromic switching. Analysis of the NIR and IR bands in the mixed valence complexes suggests there is a high degree of charge delocalisation across the DHP.
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Affiliation(s)
- Angus A Gillespie
- Chemistry, School of Molecular Science, The University of Western Australia, Crawley, WA 6009, Australia.
| | - Max Roemer
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - David Jago
- Chemistry, School of Molecular Science, The University of Western Australia, Crawley, WA 6009, Australia.
| | - Alexandre N Sobolev
- Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia
| | - Gareth L Nealon
- Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Crawley, WA 6009, Australia
| | - Peter R Spackman
- Curtin Institute for Computation, School of Molecular and Life Sciences, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
| | - Stephen A Moggach
- Chemistry, School of Molecular Science, The University of Western Australia, Crawley, WA 6009, Australia.
| | - George A Koutsantonis
- Chemistry, School of Molecular Science, The University of Western Australia, Crawley, WA 6009, Australia.
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3
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Donnelly PS, Harrowfield JM, Koutsantonis GA, Lengkeek NA, Ling I, Nealon GL, McInnes LE, Skelton BW, Sobolev AN, White AH, White JM. Inert Transition Metal Ion Complexes in Organic Synthesis: Protection and Activation. Chem Asian J 2023; 18:e202300556. [PMID: 37442812 DOI: 10.1002/asia.202300556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/10/2023] [Accepted: 07/13/2023] [Indexed: 07/15/2023]
Abstract
Single-crystal X-ray diffraction studies for a variety of metal ion complexes of functionalised sarcophagines (sarcophagine=sar=3,6,10,13,16,19-hexa-azabicyclo[6.6.6]icosane) have further confirmed not only that the form of the metal ion/sar unit is unique for each metal, albeit with a sensitivity of the conformation to the associated counter anions, but also that for any given metal and ligand substituent, the dimensions (bond lengths and angles) of the complex and the substituent at the secondary nitrogen centres do not differ significantly from those of the isolated components. Despite this, where the substituent contains reactive sites, the reactivity differs markedly from that of their form in an uncoordinated substrate. Rationalisations are offered for these differences, in part through the use of Hirshfeld surface analysis of the intermolecular interactions. The kinetic inertness of the complexes means that the metal ions can be considered to act as regioselective protecting groups.
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Affiliation(s)
- Paul S Donnelly
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Jack M Harrowfield
- Institut de Science et d'Ingénierie Supramoléculaires, Université de Strasbourg, Strasbourg, 67083, France
| | - George A Koutsantonis
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Nigel A Lengkeek
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Irene Ling
- School of Science, Monash University Malaysia, Jalan Lagoon Selatan, Bandar Sunway, 47500, Selangor, Malaysia
| | - Gareth L Nealon
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Lachlan E McInnes
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria, 3010, Australia
| | - Brian W Skelton
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | - Alexandre N Sobolev
- School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Hwy, Perth, WA 6009, Australia
| | | | - Jonathan M White
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Melbourne, Victoria, 3010, Australia
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4
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Sala S, James PJC, Nealon GL, Fromont J, Gomez O, Vuong D, Lacey E, Flematti GR. Dendrillic Acids A and B: Nitrogenous, Rearranged Spongian Nor-Diterpenes from a Dendrilla sp. Marine Sponge. J Nat Prod 2023; 86:482-489. [PMID: 36926864 DOI: 10.1021/acs.jnatprod.2c01087] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Two nitrogenous rearranged spongian nor-diterpenoids, dendrillic acids A and B, were isolated from a marine sponge Dendrilla sp. (order: Dendroceratida; family: Darwinellidae). The structures of the metabolites were elucidated on the basis of spectroscopic analysis as well as density functional theory prediction of NMR chemical shifts and application of the DP4+ algorithm. The absolute configuration of the metabolites was established via comparison of experimental and time-dependent density functional theory predicted electronic circular dichroism data. An unusual epimerization reaction was observed leading to the interconversion of the metabolites upon storage in dimethyl sulfoxide solution, which is proposed to proceed via an anionic pathway as probed via isotopic incorporation experiments. Evaluation against a panel of micro-organisms and cell lines revealed that the compounds were devoid of any significant biological activity against all organisms tested, with the exception of mild antiprotozoal activity displayed by dendrillic acid B (2) against Giardia duodenalis.
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Affiliation(s)
- Samuele Sala
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
- Australian National Phenome Centre and Centre for Computational and Systems Medicine, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA 6150, Australia
| | - Patrick J C James
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Gareth L Nealon
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Jane Fromont
- Collection and Research, Western Australian Museum, Welshpool, WA 6106, Australia
| | - Oliver Gomez
- Collection and Research, Western Australian Museum, Welshpool, WA 6106, Australia
| | - Daniel Vuong
- Microbial Screening Technologies Pty. Ltd., Smithfield, NSW 2164, Australia
| | - Ernest Lacey
- Microbial Screening Technologies Pty. Ltd., Smithfield, NSW 2164, Australia
| | - Gavin R Flematti
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
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Loedolff MJ, Fuller RO, Nealon GL, Saunders M, Spackman MA, Koutsantonis GA. Solution-phase decomposition of ferrocene into wüstite-iron oxide core-shell nanoparticles. Dalton Trans 2022; 51:1603-1611. [PMID: 34994360 DOI: 10.1039/d1dt03222d] [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
We report an improved method for the controlled solvent-phase decomposition of ferrocene into highly crystalline monodisperse iron oxide nanoparticles at relatively low temperatures. Solution-phase decomposition of ferrocene into nanoparticles has received little attention in the literature, due to the percieved stability of ferrocene. However, we synthesised wüstite FeO-iron oxide core-shell nanoparticles by thermally decomposing ferrocene in 1-octadecene solvent and in the presence of oleic acid and oleylamine, as surfactants. We report procedures that provide cubic and spherical core-shell iron oxide nanoparticles whose size (29.3 ± 2.3 nm for spheres, 38.6 ± 6.9 nm for distorted cubes and 23.5 ± 2.4 nm for distorted cubes with concave faces) and shape can be controlled through simple adjustments to reaction parameters. Transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, electron energy-loss spectroscopy and powder X-ray diffraction analysis methods were used to characterise the nanoparticles.
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Affiliation(s)
- Matthys J Loedolff
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, Western Australia, 6009, Australia.
| | - Rebecca O Fuller
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, Western Australia, 6009, Australia.
| | - Gareth L Nealon
- Centre for Microscopy, Characterisation and Analysis (CMCA), The University of Western Australia (M310), 35 Stirling Highway, Crawley, Western Australia, 6009, Australia
| | - Martin Saunders
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, Western Australia, 6009, Australia. .,Centre for Microscopy, Characterisation and Analysis (CMCA), The University of Western Australia (M310), 35 Stirling Highway, Crawley, Western Australia, 6009, Australia
| | - Mark A Spackman
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, Western Australia, 6009, Australia.
| | - George A Koutsantonis
- School of Molecular Sciences, The University of Western Australia (M310), 35 Stirling Highway, Crawley, Western Australia, 6009, Australia.
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Sheng Loong Tan N, Nealon GL, Moggach SA, Lynam JM, Ogden MI, Massi M, Lowe AB. (η4-Tetrafluorobenzobarrelene)-η1-((tri-4-fluorophenyl)phosphine)-η1-(2-phenylphenyl)rhodium(I): A Catalyst for the Living Polymerization of Phenylacetylenes. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00906] [Citation(s) in RCA: 3] [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: 01/27/2023]
Affiliation(s)
- Nicholas Sheng Loong Tan
- School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia
| | - Gareth L. Nealon
- Centre for Microscopy, Characterisation, and Analysis (CMCA) and School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
| | - Stephen A. Moggach
- Centre for Microscopy, Characterisation, and Analysis (CMCA) and School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
| | - Jason M. Lynam
- Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
| | - Mark I. Ogden
- School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia
| | - Massimiliano Massi
- School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia
| | - Andrew B. Lowe
- School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia
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Wdowiak AP, Duong MN, Joyce RD, Boyatzis AE, Walkey MC, Nealon GL, Arthur PG, Piggott MJ. Isotope-Coded Maleimide Affinity Tags for Proteomics Applications. Bioconjug Chem 2021; 32:1652-1666. [PMID: 34160215 DOI: 10.1021/acs.bioconjchem.1c00206] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Isotope-coded affinity tags (ICATs) are valuable tools for mass spectrometry-based quantitative proteomics, in particular, for comparison of protein (cysteine-residue) thiol oxidation state in normal, stressed, and diseased tissue. However, the iodoacetamido electrophile used in most commercial ICATs suffers from poor thiol-selectivity and modest rates of adduct formation, which can lead to spurious results. Hence, we designed and synthesized three ICATs containing thiol-selective N-alkylmaleimide electrophiles (isotope-coded maleimide affinity tags = ICMATs) and assessed these as mass spectrometry probes for ratiometric analysis of lysozyme and muscle proteomes. Two ICMAT pairs containing butylene/D8-butylene linkers were effective MS probes, but not ideal for typical proteomics workflows, because peptides bearing these tags frequently did not coelute with HPLC. A switch to a phenylene/13C6-phenylene linker solved this issue without compromising the efficiency of adduct formation.
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8
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Sala S, Nealon GL, Sobolev AN, Fromont J, Gomez O, Flematti GR. Structure Reassignment of Echinosulfone A and the Echinosulfonic Acids A-D Supported by Single-Crystal X-ray Diffraction and Density Functional Theory Analysis. J Nat Prod 2020; 83:105-110. [PMID: 31934769 DOI: 10.1021/acs.jnatprod.9b00902] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two previously reported bis-indole alkaloids, echinosulfone A and echinosulfonic acid B, have been isolated for the first time from a Western Australian marine sponge, Crella sp. (order: Poecilosclerida, family: Crellidae). Single-crystal X-ray diffraction of a decomposition product of echinosulfone A prompted our investigation and subsequent structure reassignment of the echinosulfonic acid natural product family, which we report here. The reassignments are supported by analysis of 1D and 2D NMR data, MS fragmentation, and DFT calculations of 13C NMR shifts.
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Affiliation(s)
- Samuele Sala
- School of Molecular Sciences , The University of Western Australia , Crawley , WA 6009 , Australia
| | - Gareth L Nealon
- School of Molecular Sciences , The University of Western Australia , Crawley , WA 6009 , Australia
| | - Alexandre N Sobolev
- School of Molecular Sciences , The University of Western Australia , Crawley , WA 6009 , Australia
| | - Jane Fromont
- Western Australian Museum , Welshpool , WA 6106 , Australia
| | - Oliver Gomez
- Western Australian Museum , Welshpool , WA 6106 , Australia
| | - Gavin R Flematti
- School of Molecular Sciences , The University of Western Australia , Crawley , WA 6009 , Australia
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9
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Loong Tan NS, Nealon GL, Turner GF, Moggach SA, Ogden MI, Massi M, Lowe AB. Rh(I)(2,5-norbornadiene)(biphenyl)( tris(4-fluorophenyl)phosphine): Synthesis, Characterization, and Application as an Initiator in the Stereoregular (Co)Polymerization of Phenylacetylenes. ACS Macro Lett 2020; 9:56-60. [PMID: 35638650 DOI: 10.1021/acsmacrolett.9b00975] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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
The synthesis of the Rh(I)-aryl complex, Rh(I)(nbd)(BiPh)(P(4-FC6H4)3) is reported and its efficacy as an initiator for the (co)polymerization of phenylacetylenes established. The X-ray crystal structure indicates that the complex adopts a slightly distorted square planar geometry whose purity and structure was also confirmed by elemental analysis and 1H, 13C, 31P, 19F, 103Rh, and 31P-103Rh{1H} HMQC NMR spectroscopy. We demonstrate that Rh(I)(nbd)(BiPh)(P(4-FC6H4)3) mediates the (co)polymerization of phenylacetylenes in a controlled fashion with initiation efficiencies as high as 0.98, as evidenced by the pseudo-first-order kinetic and number-average molecular weight versus conversion profiles. The ability to form well-defined AB diblock copolymers, in a stereoregular manner, by sequential monomer addition is verified in the block copolymerization of phenylacetylene with 4-fluorophenylacetylene with quantitative crossover efficiency, as determined by size exclusion chromatography.
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Affiliation(s)
- Nicholas Sheng Loong Tan
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Kent Street, Bentley, Perth, Western Australia 6102, Australia
| | - Gareth L. Nealon
- Centre for Microscopy, Characterisation, and Analysis (CMCA) and School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Gemma F. Turner
- Centre for Microscopy, Characterisation, and Analysis (CMCA) and School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Stephen A. Moggach
- Centre for Microscopy, Characterisation, and Analysis (CMCA) and School of Molecular Sciences, M310, University of Western Australia, 35 Stirling Highway, Perth, Western Australia 6009, Australia
| | - Mark I. Ogden
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Kent Street, Bentley, Perth, Western Australia 6102, Australia
| | - Massimiliano Massi
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Kent Street, Bentley, Perth, Western Australia 6102, Australia
| | - Andrew B. Lowe
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Kent Street, Bentley, Perth, Western Australia 6102, Australia
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Evans CW, Edwards S, Kretzmann JA, Nealon GL, Singh R, Clemons TD, Norret M, Boyer CA, Iyer KS. Synthetic copolymer conjugates of docetaxel and in vitro assessment of anticancer efficacy. NEW J CHEM 2020. [DOI: 10.1039/d0nj03425h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Docetaxel (DTX) is a widely used chemotherapy drug that is associated with numerous side effects and limited bioavailability. We show synthetic copolymer conjugates of docetaxel with drug loading up to 20% and assess their efficacy in MCF-7 cells.
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Affiliation(s)
- Cameron W. Evans
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | - Sky Edwards
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | | | - Gareth L. Nealon
- Centre for Microscopy
- Characterisation and Analysis
- University of Western Australia
- Crawley
- Australia
| | - Ruhani Singh
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | - Tristan D. Clemons
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | - Marck Norret
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | - Cyrille A. Boyer
- School of Chemical Engineering and Cluster for Macromolecular Design
- Faculty of Engineering
- The University of New South Wales
- Kensington
- Australia
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Nealon GL, McIldowie MJ, Skelton BW, Mocerino M, Massi M, Ogden MI. Structural Variations in the Complete Series of Lanthanoid Complexes of a Calix[4]arene Trisamide. Aust J Chem 2020. [DOI: 10.1071/ch17484] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Lanthanoid picrate (pic) complexes of 5,11,17,23-tetra-tert-butyl-25-hydroxy-26,27,28-tris(diethylcarbamoylmethoxy)calix[4]arene (LH) have been synthesised and structurally characterised, to complete this series for all lanthanoids (other than promethium). From cerium to lutetium, three structural types are observed: Type I, [Ln(L)(O,O′-pic)](pic), Ln=Ce–Dy; Type II, [Ln(L)(O-pic)](pic), Ln=Tb, Ho; Type III, [Ln(L)(HOEt)](pic)2, Ln=Er–Lu. With lanthanum, three different ten-coordinate complexes were characterised; [Ln(L)(O,O′-pic)(HOEt)](pic), [Ln(L)(O,O′-pic)(OH2)](pic), and [Ln(L)(O,O′-pic)(HOMe)](pic). The crystallisation of Type I and II observed for terbium shows that the stability of the different structures are sensitively poised at the transition points. Nevertheless, the structures show that the vacant space in the coordination sphere left by the trisamide L tends to reduce across the series as expected. It is occupied by a bidentate picrate anion and unidentate solvent molecule with lanthanum, a bidentate picrate anion for cerium to dysprosium (Type I), a unidentate picrate anion for terbium and holmium (Type II), and finally a unidentate solvent molecule from erbium to lutetium (Type III). The coordination number thus reduces from 10 to 8 across the series.
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12
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Tan NSL, Nealon GL, Lynam JM, Sobolev AN, Rowles MR, Ogden MI, Massi M, Lowe AB. A (2-(naphthalen-2-yl)phenyl)rhodium(i) complex formed by a proposed intramolecular 1,4-ortho-to-ortho' Rh metal-atom migration and its efficacy as an initiator in the controlled stereospecific polymerisation of phenylacetylene. Dalton Trans 2019; 48:16437-16447. [PMID: 31651004 DOI: 10.1039/c9dt02953b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The synthesis of a novel Rh(i)-aryl complex is detailed and its ability to serve as an initiator in the stereospecific polymerisation of phenylacetylene evaluated. Targeting the Rh(i) species, (2-phenylnaphthalen-1-yl)rhodium(i)(2,5-norbornadiene)tris(para-fluorophenylphosphine), Rh(nbd)(P(4-FC6H4)3)(2-PhNapth), following recrystallization we obtained the isomeric (2-(naphthalen-2-yl)phenyl)rhodium(i) complex, Rh(nbd)(P(4-FC6H4)3)(2-NapthPh), as determined by X-ray single-crystal structure analysis, and confirmed by X-ray powder diffraction. The isolation of the latter species was proposed to occur from the target (2-PhNapth) derivative via an intramolecular 1,4-Rh atom migration. This supposition was supported by density functional theory (DFT) calculations that indicated the isolated (2-NapthPh) derivative has lower energy (-19 kJ mol-1) than the targeted complex. The structure of the isolated (2-NapthPh) species was confirmed by multinuclear NMR spectroscopy including 2D 31P-103Rh{1H, 103Rh}, heteronuclear multiple-quantum correlation (HMQC) experiments; however, NMR analysis indicated the presence of a second, minor species in solution in an approximate 1 : 4 ratio with the 2-NapthPh complex. The minor species was identified as a second structural isomer, the 3-phenylnaphthyl derivative, proposed to be formed under a dynamic equilibrium with the 2-NapthPh derivative via a second 1,4-Rh atom migration. DFT calculations indicate that this 1,4-migration proceeds through a low-energy pathway involved in the oxidative addition of a C-H bond to Rh followed by a reductive elimination with the distribution of the products being thermodynamically controlled. The recrystallized Rh(nbd)(P(4-FC6H4)3)(2-NapthPh) complex was subsequently evaluated as an initiator in the polymerisation of phenylacetylene (PA); gratifyingly, the Rh(i) species was an active initiating species with the pseudo-first-order kinetic and molecular weight evolution vs time plots both linear implying a controlled polymerisation while yielding (co)polymers with low dispersities (Đ = Mw/Mn typically ≤1.25) and high cis-transoidal stereoregularity (>95%). Typical initiation efficiencies, while not quantitative (as judged by size exclusion chromatography), were nonetheless high at ca. 0.8. The presence of the minor 3-phenylnaphthyl species when in solution is proposed to be the cause of the observed non-quantitative initiation.
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Affiliation(s)
- Nicholas Sheng Loong Tan
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia.
| | - Gareth L Nealon
- Centre for Microscopy, Characterisation and Analysis (CMCA), M310, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia.
| | - Jason M Lynam
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
| | - Alexandre N Sobolev
- Centre for Microscopy, Characterisation and Analysis (CMCA), M310, University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia.
| | - Matthew R Rowles
- John de Laeter Centre, Curtin University, Bentley, Perth, WA 6102, Australia
| | - Mark I Ogden
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia.
| | - Massimiliano Massi
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia.
| | - Andrew B Lowe
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) and School of Molecular and Life Sciences (MLS), Curtin University, Bentley, Perth, WA 6102, Australia.
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13
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Roemer M, Wild DA, Sobolev AN, Skelton BW, Nealon GL, Piggott MJ, Koutsantonis GA. Carbon-Rich Trinuclear Octamethylferrocenophanes. Inorg Chem 2019; 58:3789-3799. [DOI: 10.1021/acs.inorgchem.8b03389] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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14
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Tan NSL, Simpson PV, Nealon GL, Sobolev AN, Raiteri P, Massi M, Ogden MI, Lowe AB. Rhodium(I)‐α‐Phenylvinylfluorenyl Complexes: Synthesis, Characterization, and Evaluation as Initiators in the Stereospecific Polymerization of Phenylacetylene. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801411] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nicholas Sheng Loong Tan
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) Curtin University Kent Street, Bentley 6102 Perth WA Australia
- School of Molecular and Life Sciences (MLS) Curtin University Kent Street, Bentley 6102 Perth, WA Australia
| | - Peter V. Simpson
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) Curtin University Kent Street, Bentley 6102 Perth WA Australia
- School of Molecular and Life Sciences (MLS) Curtin University Kent Street, Bentley 6102 Perth, WA Australia
| | - Gareth L. Nealon
- Centre for Microscopy, Characterisation and Analysis (CMCA), M310 University of Western Australia 35 Stirling Highway 6009 Perth WA Australia
| | - Alexandre N. Sobolev
- Centre for Microscopy, Characterisation and Analysis (CMCA), M310 University of Western Australia 35 Stirling Highway 6009 Perth WA Australia
| | - Paolo Raiteri
- School of Molecular and Life Sciences (MLS) Curtin University Kent Street, Bentley 6102 Perth, WA Australia
- Curtin Institute for Computation (CIC) Curtin University Kent Street, Bentley 6102 Perth WA Australia
- The Institute for Geoscience Research (TIGeR) Curtin University Kent Street, Bentley 6102 Perth WA Australia
| | - Massimiliano Massi
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) Curtin University Kent Street, Bentley 6102 Perth WA Australia
- School of Molecular and Life Sciences (MLS) Curtin University Kent Street, Bentley 6102 Perth, WA Australia
| | - Mark I. Ogden
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) Curtin University Kent Street, Bentley 6102 Perth WA Australia
- School of Molecular and Life Sciences (MLS) Curtin University Kent Street, Bentley 6102 Perth, WA Australia
| | - Andrew B. Lowe
- Curtin Institute for Functional Molecules and Interfaces (CIFMI) Curtin University Kent Street, Bentley 6102 Perth WA Australia
- School of Molecular and Life Sciences (MLS) Curtin University Kent Street, Bentley 6102 Perth, WA Australia
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15
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Goggin DE, Nealon GL, Cawthray GR, Scaffidi A, Howard MJ, Powles SB, Flematti GR. Identity and Activity of 2,4-Dichlorophenoxyacetic Acid Metabolites in Wild Radish ( Raphanus raphanistrum). J Agric Food Chem 2018; 66:13378-13385. [PMID: 30516986 DOI: 10.1021/acs.jafc.8b05300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Synthetic auxin herbicides, such as 2,4-dichlorophenoxyacetic acid (2,4-D), are widely used for selective control of broadleaf weeds in cereals and transgenic crops. Although the troublesome weed wild radish ( Raphanus raphanistrum) has developed resistance to 2,4-D, no populations have yet displayed an enhanced capacity for metabolic detoxification of the herbicide, with both susceptible and resistant wild radish plants readily metabolizing 2,4-D. Using mass spectrometry and nuclear magnetic resonance, the major 2,4-D metabolite was identified as the glucose ester, and its structure was confirmed by synthesis. As expected, both the endogenous and synthetic compounds retained auxin activity in a bioassay. The lack of detectable 2,4-D hydroxylation in wild radish and the lability of the glucose ester suggest that metabolic 2,4-D resistance is unlikely to develop in this species.
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Affiliation(s)
| | | | | | | | - Mark J Howard
- School of Chemistry , University of Leeds , Leeds LS2 9JT , United Kingdom
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16
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Affiliation(s)
- Glenn A. Pullella
- Chemistry,
School of Molecular Sciences, University of Western Australia, Perth, Australia
| | - Duncan A. Wild
- Chemistry,
School of Molecular Sciences, University of Western Australia, Perth, Australia
| | - Gareth L. Nealon
- Centre
for Microscopy, Characterisation and Analysis, University of Western Australia, Perth, Australia
| | - Mikhail Elyashberg
- Moscow
Department, Advanced Chemistry Development Ltd., 6 Akademik Bakulev
Street, Moscow 117513, Russian Federation
| | - Matthew J. Piggott
- Chemistry,
School of Molecular Sciences, University of Western Australia, Perth, Australia
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17
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Roemer M, Wild DA, Skelton BW, Sobolev AN, Nealon GL, Piggott MJ, Koutsantonis GA. Control over cyclisation sequences of 1,1′-bifunctional octamethylferrocenes to ferrocenophanes. Dalton Trans 2017; 46:10899-10907. [DOI: 10.1039/c7dt02037f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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
This paper describes the facile synthesis of a number of electron rich octamethyl[1.4]ferrocenophanes with unsaturated handles from 1,1′-bis(1-chlorovinyl)octamethylferrocene.
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Affiliation(s)
- Max Roemer
- Chemistry
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | - Duncan A. Wild
- Chemistry
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | - Brian W. Skelton
- Chemistry
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
| | - Alexandre N. Sobolev
- Centre for Microscopy
- Characterisation and Analysis
- University of Western Australia
- Crawley
- Australia
| | - Gareth L. Nealon
- Centre for Microscopy
- Characterisation and Analysis
- University of Western Australia
- Crawley
- Australia
| | - Matthew J. Piggott
- Chemistry
- School of Molecular Sciences
- University of Western Australia
- Crawley
- Australia
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18
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Abstract
An azobenzene derivative reversibly switches to a less effective crystal growth modifier of calcite when irradiated by UV light.
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Affiliation(s)
- Gareth L. Nealon
- Department of Chemistry and Nanochemistry Research Institute
- Curtin University
- Perth
- Australia
- Centre for Microscopy
| | - David H. Brown
- Department of Chemistry and Nanochemistry Research Institute
- Curtin University
- Perth
- Australia
| | - Franca Jones
- Department of Chemistry and Nanochemistry Research Institute
- Curtin University
- Perth
- Australia
| | - Gordon Parkinson
- Fuels and Energy Technology Institute
- Curtin University
- Perth
- Australia
| | - Mark I. Ogden
- Department of Chemistry and Nanochemistry Research Institute
- Curtin University
- Perth
- Australia
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19
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Fleutot S, Nealon GL, Pauly M, Pichon BP, Leuvrey C, Drillon M, Gallani JL, Guillon D, Donnio B, Begin-Colin S. Spacing-dependent dipolar interactions in dendronized magnetic iron oxide nanoparticle 2D arrays and powders. Nanoscale 2013; 5:1507-16. [PMID: 23306456 DOI: 10.1039/c2nr32117c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Self-assembly of nanoparticles (NPs) into tailored structures is a promising strategy for the production and design of materials with new functions. In this work, 2D arrays of iron oxide NPs with interparticle distances tuned by grafting fatty acids and dendritic molecules at the NPs surface have been obtained over large areas with high density using the Langmuir-Blodgett technique. The anchoring agent of molecules and the Janus structure of NPs are shown to be key parameters driving the deposition. Finally the influence of interparticle distance on the collective magnetic properties in powders and in monolayers is clearly demonstrated by DC and AC SQUID measurements. The blocking temperature T(B) increases as the interparticle distance decreases, which is consistent with the fact that dipolar interactions are responsible for this increase. Dipolar interactions are found to be stronger for particles assembled in thin films compared to powdered samples and may be described by using the Vogel Fulcher model.
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Affiliation(s)
- Solenne Fleutot
- Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR CNRS-UdS 7504, 23, rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
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Abstract
Gold nanoparticles currently elicit an intense and very broad research activity because of their peculiar properties. Be it in catalysis, optics, electronics, sensing or theranostics, new applications are found daily for these materials. Approximately a decade ago a report was published with magnetometry data showing that gold nanoparticles, most surprisingly, could also be magnetic, with features that the usual rules of magnetism were unable to explain. Many ensuing experimental papers confirmed this observation, although the reported magnetic behaviours showed a great variability, for unclear reasons. In this review, most of the experimental facts pertaining to "magnetic gold" are summarized. The various theories put forth for explaining this unexpected magnetism are presented and discussed. We show that despite much effort, a satisfying explanation is still lacking and that the field of hypotheses should perhaps be widened.
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Affiliation(s)
- Gareth L Nealon
- IPCMS, CNRS, UMR7504, Université de Strasbourg, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France
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21
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Gréget R, Nealon GL, Vileno B, Turek P, Mény C, Ott F, Derory A, Voirin E, Rivière E, Rogalev A, Wilhelm F, Joly L, Knafo W, Ballon G, Terazzi E, Kappler JP, Donnio B, Gallani JL. Magnetic Properties of Gold Nanoparticles: A Room-Temperature Quantum Effect. Chemphyschem 2012; 13:3092-7. [DOI: 10.1002/cphc.201200394] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2012] [Indexed: 11/11/2022]
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22
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Nealon GL, Greget R, Dominguez C, Nagy ZT, Guillon D, Gallani JL, Donnio B. Liquid-crystalline nanoparticles: Hybrid design and mesophase structures. Beilstein J Org Chem 2012; 8:349-70. [PMID: 22509204 PMCID: PMC3326612 DOI: 10.3762/bjoc.8.39] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Accepted: 02/09/2012] [Indexed: 01/28/2023] Open
Abstract
Liquid-crystalline nanoparticles represent an exciting class of new materials for a variety of potential applications. By combining supramolecular ordering with the fluid properties of the liquid-crystalline state, these materials offer the possibility to organise nanoparticles into addressable 2-D and 3-D arrangements exhibiting high processability and self-healing properties. Herein, we review the developments in the field of discrete thermotropic liquid-crystalline nanoparticle hybrids, with special emphasis on the relationship between the nanoparticle morphology and the nature of the organic ligand coating and their resulting phase behaviour. Mechanisms proposed to explain the supramolecular organisation of the mesogens within the liquid-crystalline phases are discussed.
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Affiliation(s)
- Gareth L Nealon
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg (UMR 7504), 23 rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
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23
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Driscoll CR, Reid BL, McIldowie MJ, Muzzioli S, Nealon GL, Skelton BW, Stagni S, Brown DH, Massi M, Ogden MI. A “plug-and-play” approach to the preparation of transparent luminescent hybrid materials based on poly(methyl methacrylate), a calix[4]arene cross-linking agent, and terbium ions. Chem Commun (Camb) 2011; 47:3876-8. [DOI: 10.1039/c0cc05570k] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Barnard KR, Nealon GL, Ogden MI, Skelton BW. Crystallographic Determination of Three Ni-α-Hydroxyoxime-Carboxylic Acid Synergist Complexes. Solvent Extraction and Ion Exchange 2010. [DOI: 10.1080/07366299.2010.515169] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Keith R. Barnard
- a CSIRO Process Science and Engineering, Parker Centre, CSIRO Minerals Down Under National Research Flagship , Waterford, WA, Australia
| | - Gareth L. Nealon
- b Department of Chemistry, Parker Centre , Curtin University , Bentley, WA, Australia
| | - Mark I. Ogden
- b Department of Chemistry, Parker Centre , Curtin University , Bentley, WA, Australia
| | - Brian W. Skelton
- c Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences , University of Western Australia , Crawley, WA, Australia
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Koutsantonis GA, Lee J, Lengkeek NA, Nealon GL, Skelton BW, White AH. Synthesis and characterisation of trinuclear metal complexes derived from carboxymethyl-substituted sarcophagine macrobicyclic cage amines. J INCL PHENOM MACRO 2010. [DOI: 10.1007/s10847-009-9634-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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26
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Dittrich B, Harrowfield JM, Koutsantonis GA, Nealon GL, Skelton BW. Long tailed cage amines: Synthesis, metal complexation, and structure. Dalton Trans 2010; 39:3433-48. [DOI: 10.1039/b921930g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Brown DH, Nealon GL, Simpson PV, Skelton BW, Wang Z. Silver and Palladium Complexes of a Bis(benzimidazolin-2-ylidene)pyridine Pincer Ligand. Organometallics 2009. [DOI: 10.1021/om801144m] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- David H. Brown
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia, and Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Gareth L. Nealon
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia, and Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Peter V. Simpson
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia, and Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Brian W. Skelton
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia, and Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Zhisen Wang
- Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia, and Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, WA 6009, Australia
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Harrowfield JM, Koutsantonis GA, Nealon GL, Skelton BW, Spackman MA. Proton switching of polarity in metalloamphiphile crystals. CrystEngComm 2009. [DOI: 10.1039/b817145a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Clark IJ, Crispini A, Donnelly PS, Engelhardt LM, Harrowfield JM, Jeong SH, Kim Y, Koutsantonis GA, Lee YH, Lengkeek NA, Mocerino M, Nealon GL, Ogden MI, Park YC, Pettinari C, Polanzan L, Rukmini E, Sargeson AM, Skelton BW, Sobolev AN, Thuéry P, White AH. Variations on a Cage Theme: Some Complexes of Bicyclic Polyamines as Supramolecular Synthons. Aust J Chem 2009. [DOI: 10.1071/ch09356] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Dedication: One of Alan Sargeson’s great abilities was to seek out knowledge on topics of which he was not the master from those people with the expertise. This led occasionally to publications with a ‘cricket team’ of authors but with a rich brew of information, often international. Alan also insisted that all authors were equal since, without any one, the paper would not be what it was. Hence, he endeavoured to pursue the policy, difficult to maintain over a period where an obsession with absurdities such as the order of authors and point-scoring based on meaningless publication indices became so important in the maintenance of research, of listing authors simply in alphabetical order. In describing work begun while he was still with us, we have attempted to adhere to his principles.
Analysis of a body of crystallographic information concerning metal(ii) and metal(iii) complexes of macrobicyclic hexamine ligands and some of their derivatives provides evidence for the action of a variety of intermolecular forces within the lattices. Hydrogen bonding is universal and its forms depend strongly upon the oxidation state and the particular nature of the metal ion bound to the macrobicycle. The introduction of both aliphatic and aromatic substituents leads to lattices in which these substituents associate, although, in the case of aromatic substituents, this is not necessarily a consequence of ‘π-stacking’, despite the fact that the aromatic ring planes form parallel arrays. At least in the case of CoIII, stable enantiomers of the complexes can be obtained, and in {Δ-(+)589-[Co{(NH3)(CH3)sar}]}2Cl2(C6(CO2)6)·26H2O (sar = 3,6,10,13,16,19-hexa-azabicyclo[6.6.6]icosane), the benzene hexacarboxylate anion adopts a chiral conformation in the presence of the optically active cation.
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Koutsantonis GA, Nealon GL, Buckley CE, Paskevicius M, Douce L, Harrowfield JM, McDowall AW. Wormlike micelles from a cage amine metallosurfactant. Langmuir 2007; 23:11986-11990. [PMID: 17949016 DOI: 10.1021/la701283b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We have shown that copper and cobalt metallosurfactants derived from Cu(II) and Co(III) complexes of a macrobicyclic hexamine ("cage") can form wormlike micelles in aqueous solution that may coexist with or easily interconvert with vesicle structures. The cylindrical micelle structures are unusual for triple-chain surfactants with a single headgroup and are not easily accounted for using geometrical packing arguments. The solution behavior has been characterized by cryo-TEM and SAXS measurements. Both the Cu and Co compounds display viscoelastic solutions at 1 wt %, indicating that such behavior may be anticipated for the full variety of stable metal complexes formed by the cage headgroup, auguring applications based on the incorporation of metallo aggregates into mesoporous silica structures.
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Affiliation(s)
- George A Koutsantonis
- Chemistry, School of Biomedical, Biomolecular and Chemical Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA, Australia 6009.
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Harrowfield JM, Koutsantonis GA, Kraatz HB, Nealon GL, Orlowski GA, Skelton BW, White AH. Cages on Surfaces: Thiol Functionalisation of CoIII Sarcophagine Complexes. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200600626] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Harrowfield JM, Koutsantonis GA, Nealon GL, Skelton BW, White AH. Amphiphile Structures in the Solid State: Complex Cations with Lipophilic Substituents. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200500085] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Harrowfield JM, Kim Y, Lee YH, Nealon GL, Skelton BW, White AH. Novel and Disparate Hydrogen-Bonding Associations in 13-Amino-6-hydroxy-13-methyl-1,4,8,11-tetraazacyclotetradecane Tetrahydrochloride Monohydrate. Aust J Chem 2005. [DOI: 10.1071/ch04139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The title compound crystallizes in the monoclinic space group Pn with two independent [LH4]Cl4·H2O formula units (L = 13-amino-6-hydroxy-13-methyl-1,4,8,11-tetraazacyclotetradecane) in the asymmetric unit. Despite pseudo-symmetry, these two units exhibit subtle and interesting differences in their hydrogen-bonded association by the interchange of the water molecule site with one of the chloride anions. Although a pentamine, L crystallizes as a tetrahydrochloride in which the tetracation has a conformation similar to that of tetraprotonated cyclam (1,4,8,11-tetraazacyclotetradecane), despite a different pattern of protonation sites. Difficulties in purification are perpetuated in the crystal, the minor isomeric component co-crystallizing in one of the cation sites.
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