I. Vlahou, N. Kourkoumelis, A. Michaelides
Aug 1, 2006
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0
Influential Citations
19
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Journal
Inorganica Chimica Acta
Abstract
AbstractThree ternary zinc complexes of the open chain polycarboxylic acid, tricarballylic (1,2,3-propane-tricarboxylic) acid (PTCH 3 ) havebeen isolated and characterized with crystallographic and physicochemical techniques. [Zn(PTCH)(phen)(H 2 O)] 2 AE 4H 2 O(1) (wherephen = 1,10-phenanthroline) has a unique dinuclear structure, while [Zn(PTCH)(bpy)] n AE 3nH 2 O(2) and [Zn(PTCH)(epy)] n AE 4nH 2 O(3) (where bpy = 4,4 0 -bipyridine and epy = 1,2-bis(4-pyridine)ethane) have 2D polymeric structures. The bis-deprotonated ligand, inall three complexes, uses for coordination only two oxygen atoms, which belong to the same carboxylate in 1, and to two different carb-oxylates in 2 and 3. 2006 Elsevier B.V. All rights reserved. Keywords: Metal–organic polymers; Tricarballylic acid; Zinc complexes; Coordination polymers; 2D polymers; Open chain carboxylate 1. IntroductionAliphatic and aromatic carboxylates were oftenemployed to prepare complexes with 1D chains, 2Dlayers or 3D frameworks. Aromatic or closed ring ali-phatic poly-carboxylates, such as benzene dicarboxylate,benzenetricarboxylate, cyclohexanetricarboxylate, metha-netetrabenzoate and adamantanetetracarboxylate havebeen widely investigated for the design and synthesis ofcompounds with open frameworks [1]. However, less efforthas been made on the open chain poly-carboxylates such asmaleic acid, succinic acid and fumaric acid [2], especiallythose with more than two carboxylate groups [3].On the other hand, the most common approach to therational design of two- and three-dimensional metallosu-pramolecular species has been to use appropriate combina-tions of rigid linear and/or angular components. It is nowrecognized that access to new unprecedented topologiescan be achieved by incorporating some flexibility into theligand in the form of conformationally free subunits, suchas short alkyl chains. The use of flexible ligands can pro-vide access to interesting molecular architectures withoutcomplete loss of control in the self-assembly process [4].Recently we have used the pseudopeptidic ligand tereph-thaloylbisglycine (TBGH