Synthesis and Structural Characterization of a Nickel(II) Complex with Unsymmetrical NNO-Donor Schiff Base Ligand

Abstract  

The nickel(II) complex, NiC₅H₄N–CH=N–N=C(O)–C₆H₅]₂ (1) containing a N,N,O-donor hydrazone ligand, which is the 1:1 condensation product of benzhydrazide and pyridine-2-carboxaldehyde has been synthesized and characterized by single crystal X-ray diffraction technique, spectral study and room-temperature magnetic moments. Structural investigation shows that 1 crystallizes to a monoclinic system, having space group P2(1)/c, a = 11.221(4), b = 8.893(3), c = 23.026(8) ?, β = 90.605(14)°, and Z = 4. The central nickel atom is in an N₄O₂ coordination sphere developed with the NNO donor sets of the two independently hydrazone ligands. The Ni–N (pyridine), Ni–N (imine) and Ni–O (enolate) bond distances are 2.144(2) and 2.128(2); 1.980(2) and 1.985(2); 2.0782(17) and 2.1106(17) ?, respectively. The effective magnetic moment (μ _eff) value of 1 is found to be 3.10 B.M. at 300 K.