CIRCULAR-DICHROISM SPECTRA OF MONONUCLEAR COMPLEXES OF FE(II), CO(II)AND NI(II) WITH A CHIRAL SCHIFF-BASE R-1,2-PROPANE BIS(5-IMINO-1-PHENYL-1,3-HEXADIONE)

The CD and absorption spectra of mononuclear [Co(R-pn(BAA)(2))], [Ni(R -pn(BAA)(2))]. H2O and [Fe(R-pn(BAA)(2))] in three solvents i.e. Acent onitrile, chloroform and dioxane are reported. The CD of these complex es is influenced by the solvent. These studies indicate that metal ion in [Fe(R-pn(BAA)(2))] shifts from O-2-O-2 to N-2-O-2 compartment of t he ligand in acetonitrile and dioxane solutions while in chloroform so lution it is predominantly bonded to O-2-O-2 part. The CD bands of the se complexes are interpreted in terms of electronic excitations to uni dimensional levels. Further, Delta absolute configuration around the m etal ions is assigned to these complexes.