Several complexes of thiosemicarbazone derivatives with Ni (II) have been prepared. Structural investigation of the ligands and their complexes has been made based on elemental analysis, magnetic moment, spectral (UV–Vis, ir, 1H NMR, ms), and thermal studies. The ir spectra suggest the bidentate mononegative and tridentate (neutral, mono-, and binegative) behavior of the ligands. Different stereochemistries were suggested for ...