Synthesis, Characterization, and the Antioxidative Activity of 4-{[(3,4-Dimethyl pyrrole-2-carbonyl)hydrazono](phenyl)methyl}-3-methyl-1-phenylpyrazol-5-ol and Its Zinc(II), Copper(II), Nickel(II) Complexes

A new ligand H(3)L, 4-{[(3,4-dimethylpyrrole-2-carbonyl)hydrazono](phenyl)methyl}-3-methyl-1-phenylpyrazol-5-ol and its three transition metal complexes, M(H(2)L)OAc.H(2)O (M=Cu, Ni), Zn(H(2)L)(2) have been synthesized and fully characterized on the basis of ESI-MS, elemental analyses, molar conductivities, IR spectra and (1)H-NMR. In addition, their antioxidative activities have been investigated by spectrophotometer measurements. The experimental results show that the complexes have higher activity in the suppression of O(2)(*-) and *OH than the free ligand.