Ni(II) and Mn(II) complexes of NNS tridentate ligand N′-[(2-methoxyphenyl)carbonothioyl]pyridine-2-carbohydrazide (H 2mcph): Synthesis, spectral and structural characterization

Abstract

The ligand N′-[(2-methoxyphenyl)carbonothioyl]pyridine-2-carbohydrazide (H2mcph), having NNS donor sequence, has been found to form [Ni(Hmcph)2]·CH2Cl2·0.5C6H6 and [Mn(Hmcph)2]·2H2O which have been characterized by spectroscopic and spectrometric techniques including magnetic susceptibility measurements and single crystal X-ray of both complexes. The compounds crystallize in the triclinic and monoclinic systems with the space group P over(1, ̄) and P2(1)/c, respectively with a distorted octahedral geometry about the M(II) center. The ligand is coordinated through the ring nitrogen, hydrazinic N and thione sulfur. The hydrazinic nitrogen coordinates with a shorter M-N distance than the ring nitrogen and the bond lengths in the chelate ring systems are intermediate between single and double bond distances, suggesting considerable delocalization of charge.