Studies of penta-coordinated complexes of nickel(II) with hydrazones

摘要

The combining ratio is 1:1 in all the complexes. The electronic spectra of [Ni{C_(14)H_(11)N_2O_4}Cl], [Ni{C_(14)H_(11)N_2O_3S}Cl], [Ni{C_(16)H_(13)N_2O_3}Cl] complexes show bands in the region 7000-9000, 10000-12000, 15000-17000 and 22000-23,000 cm~(-1), a characteristic of penta co-ordination assigned to ~3B_1(F) -> ~3B_2(F); ~3B_1 -> ~3B_1 (F) -> ~3A_2(P) and ~3B_1(F)->~3E transitions in order of increasing energy, based on C_4v symmetry, and the transitions are related. IR studies indicate the involvement of > C = O, - CH = N and (CONH) groups in coordination.