FT-IR AND LASER RAMAN-SPECTROSCOPIC INVESTIGATION OF TRANSITION-METALHALIDE-COMPLEXES OF BENZIDINE

FT-IR and Raman spectra of MX(2)Bzn {where M = Mn or Co, X = Cl; M = C d, X = Cl or I; and Bzn = benzidine; C12H8(NH2)(2)} complexes have bee n investigated in the region between 200-4000 cm(-1) and all the bands observed are assigned. Spectroscopic investigation indicates that ben zidine molecules are bound to metal through both nitrogen lone pairs a nd bidentate ligands. It is found that benzidine molecules are centros ymmetric in the complexes. Coordination effects on internal modes of b enzidine, particularly on the NH2 group vibrations are discussed. The general influence of the metal on the state of the coordinated amino-g roup is found to be similar to the characteristics of the aniline comp lexes.