X-ray crystallographic and 2D HETCOR NMR studies of 2-acetylthiophene-o-aminobenzoylhydrazone: synthesis and spectral studies of its transition metal complexes

The coordination chemistry of the ligand 2-acetylthiophene-o-aminobenzoylhydrazone (ATABZ) with oxovanadium(IV), manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) has been studied wherein the complexes were characterized by elemental analyses, magnetic moments, conductivity measurements, spectral (IR, 1D and 2D HETCOR NMR, EPR and UV-VIS) and thermal studies. The ligand ATABZ crystallizes in the orthorhombic system, space group Pca21 with lattice parameters a=8.5279(17) Å, b=5.8101(11) Å, c=25.720(5) Å, V=1274.3(4) Å3 and Z=4. All the complexes are neutral in nature and possess four-coordinate geometry around the metal ion except oxovanadium(IV) complex, which is five-coordinate. The X-band EPR spectra of the copper(II) and oxovanadium(IV) complexes at both room temperature and liquid nitrogen temperature have been recorded and their salient features are reported. The antibacterial and antifungal activities of the ligand and complexes have been carried out.