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. Acentonitrile, chloroform and dioxane are reported. The CD of these complexes 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 the ligand in acetonitrile and dioxane solutions while in chloroform solution it is predominantly bonded to O-2-O-2 part. The CD bands of these complexes are interpreted in terms of electronic excitations to unidimensional levels. Further, Delta absolute configuration around the metal ions is assigned to these complexes.

ROSHAN AHMAD ,SHEHNAZ IQBAL ,NASIR AHMAD ,