Isatin isonicotinoyl hydrazone complexes of tervalent metals Ti, Zr, Sn, Pt, and Th

Two forms of isatin isonicotinoyl hydrazone have been prepared. Analytical, t.g.a., electronic, i.r. and n.m.r. results show that the orange form [H.G.] is the anti-tautomer hydrazone whereas the yellow form [H.Y]. 1/2H[2]O is a mixture of imide-imidol of the syn one stabilized by H-bond through H-chelates. The complexes of Ti, Zr, Sn, Pt and Th with HG and HY were prepared and characterized using a variety of analytical, spectral and thermal measurements. The analytical data showed that 1:1 or 1:2 molar compounds were obtained. The title hydrazone behaved as a neutral or monobasic bidentate ligand coordinating through the azomethine N and isatin O or eventually as tridentate coordinating through O, N and pyridine N