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

Abstract

AbstractThe nickel(II) complex, Ni[C 5 H 4 N–CH=N–N=C(O)–C 6 H 5 ] 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) A, β = 90.605(14)°, and Z = 4. The central nickel atom is in an N 4 O 2 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) A, respectively. The effective magnetic moment (μ eff ) value of 1 is found to be 3.10 B.M. at 300 K.Graphical AbstractThe Ni(II) complex, Ni[C 5 H 4 N–CH=N–N=C(O)–C 6 H 5 ] 2 containing a hydrazone ligand has been generated into which the central Ni(II) atom belongs to a N 4 O 2 coordination environment arised from the enol form of the ligand. It possesses a distorted octahedral geometry.[IMAGE]