COMPLEXES WITH DIASTEREOISOMERIC LIGANDS .1. COPPER(II) COMPLEXES WITH THE TRIDENTATE SCHIFF-BASES OF (1R)-3-(HYDROXYMETHYLENE)CAMPHOR OR (1R)-2-(HYDROXYMETHYLENE)MENTHONE AND (S)-AMINO OR (R)-AMINO ACIDS

Copper(II) complexes with tridentate Schiff bases derived by the condensation of (+)-(hydroxymethylene)camphor or (+)-(hydroxymethylene)menthone with a series of (S)- and (R)-amino acids have been synthesized. Little interaction between the various chiral centers has been found and the conformation of the chelate rings depends mainly on the configuration of the α-carbon atom of the amino acid. ESR and electronic spectra results indicate that a competitive mechanism between the σ and π bondings, as well as between the different kinds of σ bondings of the complex, is operative. The variations of the K Fermi term are interpreted by considering an exchange polarization of the partially filled 4s orbital. © 1979, American Chemical Society. All rights reserved.