Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
Australian Journal of Chemistry

Australian Journal of Chemistry

Volume 66 Number 4 2013

RESEARCH FRONT: Coordination Polymers

CH13052Research Front on Coordination Polymers

Christopher J. Sumby
pp. 397-400
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This Research Front, dedicated to Coordination Polymers (materials also known as metal-organic frameworks), comprises a selection of papers representing the current look of this rapidly growing field. These materials have crystalline porous structures with potential applications in areas such as gas storage, separations, catalysis, biomedicine, and sensing.

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A series of discrete and polymeric copper coordination complexes featuring the 4,4'-methylenebis(1-(2-pyridyl)-3,5-dimethylpyrazole) ligand are reported, along with discussion of the structural diversity and some unexpected solvothermal reactivity.

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The synthesis of the triazolium ligand 1,4-bis(4-benzoic acid)-1-methyl-1H-1,2,3-triazolium chloride, H2L1Me, was used to explore the potential of metal–organic frameworks as catalyst supports. Under controlled conditions, H2L1Me reacts with copper(ii) nitrate to generate both potentially porous and close-packed 2D structures.

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A series of six silver(i) trifluoroacetate complexes containing new ligands each composed of a quinolinyl or pyridyl nucleus bearing one or two terminal ethynyl substituent(s) has been synthesised and characterised by X-ray crystallography. The coordination preferences of the ethynide substituent(s) at variable positions with respect to the nitrogen donor atom serve as dominant factors in directing the construction of multi-dimensional organosilver(i) networks.

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A new flexible tritopic ligand, 1,3,5-tri(4-cyanophenoxy)benzene, was shown to form three-dimensional coordination polymers that include benzene or toluene and dichloromethane as guest molecules. The luminescent properties of crystalline solid 1 were found to change significantly on complexation with AgI.

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The interaction of flexible two- and three-armed ligands with silver salts is shown to be a useful method for the self-assembly of coordination polymers. The substitution pattern of two- and three-armed ligands produces a range of complexes characterised by crystallography.

CH12444A Family of Three-Dimensional Molecular Framework Materials Containing the Three-Connecting Ligands 2,4,6-Tris(n'-pyridyl)-1,3,5-triazine: 3-tpt and 4-tpt

Suzanne M. Neville, Gregory J. Halder, Keith S. Murray, Boujemaa Moubaraki and Cameron J. Kepert
pp. 452-463
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The three-connecting ligands 2,4,6-tris(4′-pyridyl)-1,3,5-triazine (4-tpt) and 2,4,6-tris(3′-pyridyl)-1,3,5-triazine (3-tpt) have been utilised to prepare five 3D framework materials. It is shown that a range of different framework phases form depending on subtle variation in reaction conditions.

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Carrying out organic reactions in aqueous or aqueous-organic systems has ecological and economical advantages. In aqueous microemulsions, micelle structures are formed where organic transformations take place. This review discusses recent developments and challenges in the application of the microemulsion approach towards transition metal catalyzed organic reactions.

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Solvent-induced reversible crystal-to-amorphous transformation properties with chromotropism in the supramolecular network of [Co(Hampy)2(H2O)4](SO4)2(H2O)3 (1) is demonstrated. Although there is a lack of a coordination bridge to maintain the skeleton of the framework structure, the original crystalline form is recovered from collapsed amorphous structures by the restoration of water and methanol molecules.

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This paper proposes a sensing strategy which employs aptamer, unmodified gold nanoparticles (AuNP), and hexadecyltrimethylamonium bromide to detect tetracycline in raw milk. The method is based on the colourimetric assays via aggregating AuNP, and the detection limit is 122 Nm.

CH12489Synthesis and Radiosynthesis of a Novel PET Fluorobenzyl Piperazine for Melanoma Tumour Imaging; [18F]MEL054

Stephen R. Taylor, Maxine P. Roberts, Naomi A. Wyatt, Tien Q. Pham, Daniela Stark, Thomas Bourdier, Peter Roselt, Andrew Katsifis and Ivan Greguric
pp. 491-499
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2-{2-[4-(4-[18F]-Fluorobenzyl)piperazin-1-yl]-2-oxoethyl}isoindolin-1-one ([18F]MEL054), a new potent indolinone-based melanin binder designed to target melanotic tumours, was prepared by an automated, two-step radiosynthesis, comprising of the preparation of 4-[18F]fluorobenzaldehyde from 4-formyl-N,N,N-trimethylanilinium triflate, followed by reductive alkylation with 2-(2-oxo-2-piperazin-1-ylethyl)isoindolin-1-one. HPLC purification produced [18F]MEL054 in 34 ± 9 %, >99 % radiochemical purity.

CH12507Polyguanidine as a Highly Efficient and Reusable Catalyst for Knoevenagel Condensation Reactions in Water

Xian-Liang Zhao, Ke-Fang Yang, Xuan-Gan Liu, Chun-Lin Ye, Li-Wen Xu and Guo-Qiao Lai
pp. 500-504
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Polyguanidine is used as a novel and highly efficient catalyst in the Knoevenagel reaction of aldehydes with active methylene compounds in water to afford substituted electrophilic alkenes. The polyguanidine catalyst can be recovered by simple filtration and reused many times for the aqueous Knoevenagel reaction without loss of activity.

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Professor Kenneth Seddon OBE, one of AJC’s longest-standing Editors, sadly passed away on 21 January from prostate cancer. Ken was one of the world's best ionic liquids experts. His consistent unwavering support, loyalty and advocacy for AJC over the last 10 years will be sorely missed.