Vibrational studies of [Ni(II)(DIARS)(2)X]X, (DIARS=o-C6H4(As(CH3)(2))(2) and X=Cl, Br, I)

Infrared and laser Raman spectra of [Ni(II)(diars)(2)X]X, (X=Cl. Br and I) have been used as probes to determine the structures of chelated diarsine m olecules. It has been observed that the effects of metal chelation and coor dination geometry give rise to frequency shifts in these complexes. The var iation in vibrational spectroscopic features indicates reduction in the sym metry of the complexes in the crystalline environment. The effect of haloge n on the Ni-halogen stretching frequency of these square pyramidal complexe s is not as significant as observed in the case of octahedral complexes. (C ) 2001 Elsevier Science B.V. All rights reserved.