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Metal Aminocarboxylate Coordination Polymers with Chain and Layered Structures

Dan, Meenakshi and Rao, CNR (2005) Metal Aminocarboxylate Coordination Polymers with Chain and Layered Structures. In: Chemistry - A European Journal, 11 (23). pp. 7102-7109.


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The synthesis and structures of metal aminocarboxylates prepared in acidic, neutral, or alkaline media have been explored with the purpose of isolating coordination polymers with linear chain and two-dimensional layered structures. Metal glycinates of the formulae $[CoCl_2(H_2O)_2(CO_2CH_2NH_3)]$ (I), $[MnCl_2(CO_2CH_2NH_3)_2]$ (II), and $[Cd_3Cl_6(CO_2CH_2NH_3)_4]$ (III) with one-dimensional chain structures have been obtained by the reaction of the metal salts with glycine in an acidic medium under hydro/solvothermal conditions. These chain compounds contain glycine in the zwitterionic form. 4-Aminobutyric acid transforms to a cyclic amide under such reaction conditions, and the amide forms a chain compound of the formula $[CdBr_2(C_4H_7NO)_2]$ (IV). Glycine in the zwitterionic form also forms a two-dimensional layered compound of the formula $[Mn(H_2O)_2(CO_2CH_2NH_3)_2]Br_2$ (V). 6-Aminocaproic acid under alkaline conditions forms layered compounds with metals at room temperature, the metal being coordinated both by the amino nitrogen and the carboxyl oxygen atoms. Of the two layered compounds $[Cd[CO_2(CH_2)_5NH_2]_2]_2 H_2O$ (VI) and $[Cu[CO_2[(CH_2)_5NH_2]_2]_2 H_2O$ (VII), the latter has voids in which water molecules reside.

Item Type: Journal Article
Additional Information: The copyright belongs to WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Keywords: acidity;aminocarboxylates;coordination polymers;open framework structures;transition metals
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Sandhya Jagirdar
Date Deposited: 30 Dec 2005
Last Modified: 19 Sep 2010 04:22
URI: http://eprints.iisc.ac.in/id/eprint/4713

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