Ni(II) and Mn(II) complexes of NNS tridentate ligand N′-[(2-methoxyphenyl)carbonothioyl]pyridine-2-carbohydrazide (H2mcph): Synthesis, spectral and structural characterization

The ligand N'-[(2-methoxyphenyl)carbonothioyl]pyridine-2-carbohydrazide (H(2)mcph), having NNS donor sequence, has been found to form [Ni(Hmcph)(2)]center dot CH(2)Cl(2 center dot)0.5C(6)H(6) and [Mn(Hmcph)(2)]center dot 2H(2)O 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 Pi 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. (c) 2010 Elsevier Ltd. All rights reserved.