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Amino acid-lanthanide interactions, Part 2. The X-ray crystal structures of lanthanide and calcium complexes of 1-amino-cyclohexane-1-carboxylic acid (Acc6)

Aparna, K and Krishnamurthy, SS and Nethaji, M and Balaram, Padmanabhan (1997) Amino acid-lanthanide interactions, Part 2. The X-ray crystal structures of lanthanide and calcium complexes of 1-amino-cyclohexane-1-carboxylic acid (Acc6). In: Polyhedron, 16 (3). pp. 507-514.

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Official URL: http://dx.doi.org/10.1016/0277-5387(96)00264-1

Abstract

The structures of [Nd-2(Acc(6))(H2O)(6)](ClO4)(6) .(H2O)(6) (1) [Er-2(Acc(6))(4)(H2O)(8)](ClO4)(6) .(H2O)(11) (2) and [Ca-5(Acc(6))(12)(H2O)(6)](ClO4)(10).(H2O)(4) (3) (Acc(6) = 1-aminocyclohexane-1-carboxylic acid) have been determined by X-ray crystallography. The lanthanide complexes 1 and 2 are dimeric in which two lanthanide cations are bridged by four carboxylato groups of Acc(6) molecules. In addition, the neodymium complex (1) features the unidentate coordination of the carboxyl group of an Acc(6) molecule in place of a water molecule in the erbium complex (2). The coordination number in both 1 and 2 is eight. The calcium Acc(6) complex (3) is polymeric; three different calcium environments are observed in the asymmetric unit. Two calcium ions are hexa-coordinated and one is hepta-coordinated. Considerable differences are observed between the solid state structures of Ln(III) and Ca-II complexes of Acc(6

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: lanthanide-amino acid complexes; crystal structures; 1-aminocyclohexane-1-carboxylic acid.
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Mr. BH Virupaksh
Date Deposited: 14 Dec 2010 08:58
Last Modified: 14 Dec 2010 08:58
URI: http://eprints.iisc.ac.in/id/eprint/33776

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