Synthesis, Characterization And Properties Of Transition Metals With Acetone Salicyloylhydrazone

The acetone salicyloylhydrazone complexes were synthesized by the reaction of o-carboxybenzaldehyde salicyloylhydrazone (C15H12O4N2) and transition metal nitrate of Cu, Zn, Ni, Cr, Co and Pb. Four kinds of crystal for above complexes were obtained. They are Cu(C10H11O2N2)2, [Zn(C10H12O2N2)2(H2O)2](NO3)2, [Ni(C10H12O2N2)2(H2O)2](NO3)2 and [Ni(C10H12O2N2)2(C5H5N)2](NO3)2.The complexes were characterizedby element analysis, IR, UV-Vis, molar conductivity and X-ray crystal diffraction. The chemical formula of the complexes can be described as Cu(L)2 and M(HL)2(R)2(NO3)2 (M=Zn(Ⅱ), Ni(Ⅱ), Cr(Ⅲ), Co(Ⅱ) and Pb(Ⅱ), L=C10H12O2N2, R=H2O or C5H5N, n=2 or 3). The structures of the complexes showed that the original ligand o-carboxybenzaldehyde salicyloylhydrazone changed in the synthesis process, then the acetone salicyloylhydrazone complexes were synthesized. The ligand was coordinated in the form of bidentate, and two stable five membered rings were formed by N atom of imino and O atom of carbonyl with the transition metal ions.The thermal decomposition of the Cu, Zn and Ni complexes were carried out by TG-DTG analysis at 5.00℃·min-1, 10.00℃·min-1 and 15.00℃·min-1 respectively. The Kissinger and Ozawa's methods were used to calculate the apparent action energies and kinetics parameters of the second thermal decomposition stages of the complexes. The results showed that the activation Ea and correlation coefficient r of the complexes calculated by the two methods were in good agreement, the complexes had higher thermal decomposition temperature. The thermal stability for [Ni(C10H12O2N2)2(C5H5N)2](N03)2 complex is the most stable.The tests of catalytic decomposition activity to hydrogen peroxide of the Cu, Zn and Ni complexes were determined by potassium permanganate standard solution. The results showed that the complexes have better catalytic decomposition ability, especially the Cu(C10H11O2N2)2 complex.The Cu, Zn and Ni complexes display DNA binding abilities, which are ascertained by UV-Vis.The biological activity of ligand and the Cu(C10H11O2N2)2 complex to Escherichia coli (ATCC 8099) were tested. The results showed that the ligand and the Cu(C10H11O2N2)2 complex possess better antibacterial effect.