Aparna, K. ; Krishnamurthy, S. S. ; Nethaji, M. ; Balaram, P. (1997) Amino acid-lanthanide interactions-2. The X-ray crystal structures of lanthanide and calcium complexes of 1-amino cyclohexane-1-carboxylic acid (Acc6), [Nd2(Acc6)6(H2O)6](ClO4)6·(H2O)6 (1), [Er2(Acc6)4(H2O)8](ClO4)6·(H2O)11 (2) and [Ca5(Acc6)12(H2O)6](ClO4)10·(H2O)4 (3) Polyhedron, 16 (3). pp. 507-514. ISSN 0277-5387
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/027753...
Related URL: http://dx.doi.org/10.1016/0277-5387(96)00264-1
Abstract
The structures of [Nd2(Acc6)6(H2O)6](ClO4)6·(H2O)6 (1), [Er2(Acc6)4(H2O)8](ClO4)6·(H2O)11 (2) and [Ca5(Acc6)12(H2O)6](ClO4)10·(H2O)4 (3) (Acc6 = 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 Acc6 molecules. In addition, the neodymium complex (1) features the unidentate coordination of the carboxyl group of an Acc6 molecule in place of a water molecule in the erbium complex (2). The coordination number in both 1 and 2 is eight. The calcium Acc6 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 LnIII and CaII complexes of Acc6.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Lanthanide-amino Acid Complexes; Crystal Structures; 1-Aminocyclohexane-1-Carboxylic Acid |
| ID Code: | 4603 |
| Deposited On: | 18 Oct 2010 07:22 |
| Last Modified: | 16 May 2016 15:13 |
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