Circular Dichroism (CD) spectra of six mixed ligand complexes such as [Co(phen)2(bpy)]2+,[Co(phen)2gly]+,[Co(phen)2PyCA]+.[Co(bpy)2(phen)]2+ and [Co(bpy)2PyCA]+ (where phen = o-phenanthroline, bpy = 2,2' bipyridyl, gly = glycinate, PyCA = pyridine 2-carboxylate ion) in presence of different chiral environment compounds in aqueous media are reported. The CD spectra in presence of (+)-tartaric acid, (+)- malic acid and (+)-ascorbic acid consist of a positive band I between 20,408-20,740 cm-1 and a stronger, negative band II between 22,222-23,225 cm-1. A mirror image CD was obtained for these complexes in presence of (-)-tartaric acid and (-)-malic acid. The band I is assigned to electron excitation to 4A2 and band II to 4A1 upper states. The dextro enanthiomers of all these complexes have been assigned absolute DELTA-configuration around the metal ion.
CHRISTY MUNIR ,A. ASGHIR ALAM ,NASIR AHMED ,M. DANISH ,
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