Abstract
The Schiff base prepared by reacting (−)-(1R,2R)-1,2-cyclohexanediamine with 2-hydroxyacetophenone was used as a ligand for CoII and CuII. The coordination compounds were studied by u.v.–vis. absorption and by circular dichroism (c.d.) spectroscopy in solution. The complexes are four-coordinated in a slightly distorted square planar symmetry. The distortion from planarity is a main factor influencing the chiral surroundings of the metal ion. The d–d and c.t. transitions are consistent with the observed distortion, which arises from intramolecular interactions between the methyl groups attached to the Schiff base imine carbon and hydrogen atoms of the cyclohexane ring. The electrochemical properties of the CoII and CuII complexes were observed in MeCN but investigations revealed weaker oxygen activation than of CoII analogue with salicylaldehyde. The CuII complex is reduced in H2O to CuI which disproportionates to CuII and Cu0.
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