Studies of Penta-Coordinated Complexes of Nickel(II) with Hydrazones

Abstract

The combining ratio is 1:1 in all the complexes. The electronic spectra of [Ni{C₁₄H₁₁N₂O₄}Cl], [Ni{C₁₄H₁₁N₂O₃S}Cl], [Ni{C₁₆H₁₃N₂O₃}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 ³B₁(F)→³B₂(F); ³B₁(F)→³E(F); ³B₁(F)→³A₂(P) and ³B₁(F)→³E transitions in order of increasing energy, based on C₄v symmetry, and the transitions are related. IR studies indicate the involvement of > C═O, —CH═N and (CONH) groups in coordination.