Abstract
Abstract Penicillamine, even in excess, forms only bis complexes with hexacoordinate Co(II) according to potentiometric and spectrophotometric results. L -cysteine appears to behave similarly. Extensive visible circular dichroism results are reported for mixed ligand complexes of Co(II), histidine, and either penicillamine or cysteine with the ligands in a variety of configurations. The CD sign pattern and intensities are determined by the sulfhydryl compound with the histidine enantiomer having a secondary effect. It is shown that the geometry about Co(II) in yeast aldolase cannot be tetrahedral. The possibility that the Co(II) in the enzyme is hexacoordinate and bound to a sulfhydryl group is considered.
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