J. Saudi Chem. Soc.; Vol. 7. No. 2: pp. 235-242 (3003) METAL COMPLEXES OF A SCHIFF-BASE FORMED BY THE CONDENSATION OF S-BENZYLDITHIOCARBAZATE WITH N-ACETYLMORPHOLINE Saad M. Alshehri Department of Chemistry. College of Science, King Saud University. P.O.Uos 2455. Riyadh- l 145 1, Saudi Arabia (Received 13"' March 2003: Accepted 16'" June 2003) Nc\v cobillt(ll).nickcl(l1). palladium(ll). platinum( 11). and cadmium(ll ) complcscs ol'n SchilT basc ligand [IIAhl'I'] fornicd by condensation 01' N-acctylniorpholine with S-bcnzyltlitliiocar~izatc'. II~IVC been synthesized ant1 charactcrix~d by clemcntal analysis. spectral (111. IJV-vis . '11-NMR and %-NMRI nicasurcmcnts. ant1 thcrrnal analysis [TG. 1)'I.G and Dl'/\]. 'She spectral data show that the ligand bshiives as nct~trill or rnononcgativc bidcntate manner. INTRODUCTION In the recent ycars there has been considerable interest in the chemistry of tlie metal compleses of Schiff bases containing N, S, and N. 0 donors [I-81. The increased activity in this field may be attributed to thc striking structural feature, and its relation to their medicinal properties [9], their cytotosic activity [lo] and their activity against bacteria [5.1 I], cancer [I?] and fungal [13,14]. Due to our interest in the ligational behaviour of nitrogen and sulphur donor Schiff base we describe here new rnetal complexes of N- acetyl-morpholine 1iydrazine-S- benzyldithiocarbzate. The ligand lnay posses any one of the structures 1-11 shown below or they may exist as tautonieric eqi~ilibrium lnisture of these fortns. All che~nicals used were of analar grade. Synthesis of Ligand IHAMTI: Thc hydrazine-S-benzyldithiocarbazate was synthesized according to tlie general literature [15]. The Schiff base was prepared by hcating equimolar alnount of N-acetylmorpholine (6.45 g. 0.05 mol) and the benzyl 'ester ( I 0 g, 0.05 niol) in absolute ethanol (1 00 nil) in presence of few drops of glacial acetic acid and retluxed for 10 hours. The cream product appeared which was separated and crystallized from ether (m.p. 72-75°C decop.).