Synthesis, characterization and molecular modeling of nickel(II) complexes with semicarbazones and thiosemicarbazones.

Ni(II) complexes of ligands pyridine-3-formamide thiosemicarbazone (L₁), pyridine-3-formamide semicarbazone(L₂), pyridine-2-formamide  thiosemicarbazone (L₃) and pyridine-2 -formamide semicarbazone (L₄) have been synthesised. The ligands were characterised on the basis of elemental analyses, IR, ¹HNMR studies while that of the complexes were characterised by elemental analyses, molar conductance, magnetic moment, IR, electronic. On the basis of elemental analyses and molar conductance data the complexes were found to have general composition [Ni(L)₂X₂] (where L=L₁, L₂, L₃ and L₄ , X = Cl^–,NO₃^–]. On the basis of IR, electronic spectra of complexes, octahedral geometries were found with planar coordination of the ligand around Ni²⁺ ion. Molecular modeling confirmed octahedral geometry.