Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Metal Complexes of Amino Acids. I. The Circular Dichroism of Copper(II) Complexes with Optically Active Amino Acids
Takaji Yasui
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1965 Volume 38 Issue 10 Pages 1746-1749

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Abstract

On the basis of the CD measurements of the complexes of the [Cu(L-am)2] type, four CD components have been observed in the region of the d→d absorption band, namely, (+), (+), (−) and (−), listing from longer to shorter wavelengths. The L-configuration of the amino acids determines the signs of these CD components.
Judging from the CD curves of the copper-(II) complexes with L-threonine and with L-allothreonine, it has been suggested that the vicinal effect caused by the α-asymmetric carbon atom is stronger than that caused by the β-asymmetric one.
It has also been suggested that, when L-proline or L-hydroxyproline is coordinated to copper, the nitrogen atoms of these ligands are activated by the configurational stereo specificity.

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