Synthesis and characterization of Ni(III) complex with condensation product of 2-acetylpyridine and Girard’s P reagent

Abstract

The ligand (HLCl) was synthetized by the reaction of 2-acetylpyridine and Girard’s P reagent in molar ratio 1 : 1 in ethanol (1–2 drops of cc. HCl were added). The reaction of hydrazone ligand with the metal salt Ni(BF4)2·6H2O and NaN3 in a molar ratio 1:1:4 in methanol/acetonitrile/water mixture results in the formation of Ni(III) complex with composition [NiL(N3)3]. The tridentate ligand (HLCl) is coordinated in deprotonated, formally neutral, form to the nickel ion through NNO set of donor atoms forming two five-membered chelate rings and the other three coordination sites are occupied by meridionally coordinated azide anions. The ligand (HLCl) was characterized by elemental analysis, IR and NMR spectroscopy and structure of the complex was defined by X-ray analysis, IR and EPR spectroscopy, molar conductivity and elemental analysis. DFT calculations were performed to determine stability and rationalise formation of Ni(III) complex.