Metal Complexes of 3,4-Dimethoxybenzaldehyde Thiosemicarbazone

Department of Chemistry. University of Calieut. Calient-673 635
Matausoript received 15 March 1990, revised 1 April 1991, accepted 8 April 1991

The reaction of Co^II, NI^II, Cu^II , Zn^II. Cd^II and Hg^II salts with 3,4-dimethoxy­benzaldehyde thiosemicarbazone (LH) in mixed alcohol-water or absolute alcohol yielded complexes of different stoichiometries. Their elemental analyses conduc­tance, magnetic and electronic, ir and ¹H nmr spectral data revealed that the ligand coordinates with the metal ion either as anionic bidentate one (chiolate anion L^-)coordinating through the azomethine nitrogen and thioenol sulphur atoms or as neutral bidentate one (LH) coordinating through the azomethine nitrogen and thioketo sulphur atoms. The present ligand reduces Cu^ll salts to Cu^I which forms complex.