Optical rotatory power of co-ordination compounds. Part VII. The absolute configurations of tris-α-amino-carboxylato-cobalt(III) complexes

Abstract

The absorption and circular-dichroism spectra of the four isomers of tris-(+)-alanatocobalt(III) and of two of the four isomers of the corresponding L-glutamic acid complex are reported. The absolute configuration of the complexes and the electronic transitions from the ground to the components of the octahedral T_1g state of cobalt (III) are assigned. The relations between the conformation of the chelate rings, the configuration of the rings around the metal ion, and the circular dichroism are discussed.