Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/95018
Title: Syntheses, structures and properties of copper(II) complexes with thiophene-2,5-dicarboxylic acid (H2Tda) and nitrogen-containing ligands
Authors: Chen, B.-L.
Mok, K.-F. 
Ng, S.-C. 
Drew, M.G.B.
Keywords: Chain complexes
Copper(II) complexes
Crystal structures
Hydrogen bonding
Stacking interactions
Thiophene-2,5-dicarboxylic acid
Issue Date: 12-Mar-1999
Citation: Chen, B.-L.,Mok, K.-F.,Ng, S.-C.,Drew, M.G.B. (1999-03-12). Syntheses, structures and properties of copper(II) complexes with thiophene-2,5-dicarboxylic acid (H2Tda) and nitrogen-containing ligands. Polyhedron 18 (8-9) : 1211-1220. ScholarBank@NUS Repository.
Abstract: Five copper(II) complexes with thiophene-2,5-dicarboxylic acid (H2Tda): Cu(Tda)(H2O)·(H2O)2 (1), Cu(Tda)(im)2·(H2O) (2), Cu(Tda)(im)4 (3), [Cu(Tda)(py)2]n (4) and [Cu(Tda)(bipy)(H2O)]n·n[Cu(Tda)(bipy)(H 2O)2]·2nH2O (5) (im=imidazole, py=pyridine and bipy=2,2′-bipyridine) have been synthesised and their spectroscopic and thermal properties investigated. Three of them (3, 4 and 5) are structurally characterised and the Cu atom is in five coordinate, distorted square pyramidal environments. The thiophene-2,5-dicarboxylate molecule is monodentate in 3 in which the molecular structure is stabilised by intermolecular hydrogen bonding involving two of the four non-coordinated nitrogen atoms of the imidazole ligands and carboxylate groups from adjacent Tda2-. In 4 the thiophene-2,5-dicarboxylate ion is bridging tridentate and bonded to three copper atoms to form a chain polymer with alternating 16-membered ring bridged by two Tda2- and an 8-membered ring bridged by two carboxylates. Complex 5 comprises discrete [Cu(Tda)(bipy)(H2O)2] (5a), one dimensional zig-zag chain of [Cu(Tda)(bipy)(H2O)]n (5b) and water molecules of crystallization. The thiophene-2,5-dicarboxylate molecule is monodentate in 5a and involved in intermolecular stacking interactions with 2,2'-bipyridine rings, and bidentate in 5b to bridge [Cu(bipy)(H2O)] to form a one dimensional zig-zag chain.
Source Title: Polyhedron
URI: http://scholarbank.nus.edu.sg/handle/10635/95018
ISSN: 02775387
Appears in Collections:Staff Publications

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