Acta Crystallographica Section B

Structural Science

Volume 57, Part 1 (February 2001)


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Acta Cryst. (2001). B57, 45-53    [doi:10.1107/S0108768100013896]

Structures of three cis-[beta]1 and three cis-[beta]2 isomers of [Co(trien)(aminoacidato)]2+ complexes

J. Cai, X. Hu, X. Feng, L. Ji and I. Bernal

Abstract: The crystal structures and absolute configurations of three cis-[beta]1 and three cis-[beta]2 isomers of [Co(trien)(L-aminoacidato)]2+, namely [beta]1-[Lambda](SSS)([bold lambda][bold lambda][bold delta])/([bold lambda][bold delta][bold delta])-[Co(trien)(L-isoleucinato)](ClO4)2, L-isoleucinato(triethylenetetramine)cobalt(III) diperchlorate (1), [beta]1-[Lambda](SRS)([bold lambda][bold delta][bold lambda])-[Co(trien)(L-valinato)](ClO4)2, L-valinato(triethylenetetramine)cobalt(III) diperchlorate (2), [beta]1-[Delta](RSS)([bold delta][bold lambda][bold delta])-[Co(trien)(L-pyroglutamato)]ClO4, L-pyroglutamato(triethylenetetramine)cobalt(III) perchlorate (3), [beta]2-[Delta](RRS)([bold delta][bold delta][bold lambda])-[Co(trien)(L-isoleucinato)]I2·H2O, L-isoleucinato(triethylenetetramine)cobalt(III) diiodide monohydrate (4), [beta]2-[Delta](RRS)([bold delta][bold delta][bold lambda])-[Co(trien)(L-isoleucinato)](ClO4)2·2H2O, L-isoleucinato(triethylenetetramine)cobalt(III) diperchlorate dihydrate (5), and [beta]2-[Lambda](SSS)([bold delta][bold lambda][bold lambda])[Co(trien)(L-leucinato)](ClO4)2·2H2O, L-leucinato(triethylenetetramine)cobalt(III) diperchlorate dihydrate (6), have been determined. Both [beta]1 and [beta]2 isomers form inter-cation hydrogen-bonding interactions through double or triple hydrogen bonds which link the cations into helices. However, the motifs of the interactions are different in [beta]1 and [beta]2 isomers, resulting in different packing structures. A localized hydrophobic area is observed in the packing structure of (1), a unique feature amongst these six structures. This work describes the first synthesis of the [beta]1 isomer by direct reaction between amino acids and cis-[alpha]-[Co(trien)Cl2]Cl in mildly basic solution.

Online 1 February 2001

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