Crystal structure, complexation, spectroscopic characterization and antimicrobial evaluation of 3,4-dihydroxybenzylidene isonicotinyl-hydrazone

The crystal structure of 3,4-dihydroxybenzylidene isonicotinylhydrazone has been solved by X-ray crystallography. The metal complexes have been prepared and characterized. A tetrahedral geometry was proposed for the Co(II), Cu(II), Zn(II) and Cd(II) complexes, square-planar for the Pd(II) complex, square-pyramid for the VO2+ complex and octahedral for the Ni(II) complex. Some complexes have biological activity.44