Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Stereoselectivity in Mixed Tris-type Complexes of Cobalt(III) with L-Proline and L- or D-Aspartic Acid
Toshitsugu MatsudaMuraji Shibata
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1973 Volume 46 Issue 10 Pages 3104-3109

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Abstract

Mixed complexes with L-proline and L- or D-aspartic acid, [Co(L-pro)3−n(L-(or D-)asp)n]n (n=1,2), have been prepared and separated into a number of stereoisomers by means of ion-exchange chromatography. The structures of the isomers have been characterized by various spectral data. As to the [Co(L-pro)(D-asp)2]2− and [Co(L-pro)2(D-asp)] complexes, all of three possible mer-isomers have been isolated in their Δ-forms. The formation ratios among the isomeric species in the reaction system have been estimated spectrophotometrically. Marked differences in stereoselectivity have been found between the L-aspartato complexes and the corresponding D-aspartato complexes. These selectivities have been qualitatively explained in terms of the interaction between the dangling β-carboxylate group in a chelated aspartate ion and the adjacent ligand.

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