The complexes of composition R 2 Sn(L)2 and RjSnL (where R = butyl and L = monoanion of Schiff bases of S-benzyldithiocarbazate) have been prepared by the reaction of Schiff bases with metal oxides. The newly synthesized complexes have been characterized by elemental analysis, conductance measurements and molecular weight determinations. The mode of bonding and geometry of the complexes have been suggested on the basis of IR, UV and multinuclear 'H, i3 C and Sn NMR spectral studies. Schiff bases and their tin complexes have also been screened for their antibacterial activities, as several bacteria are quite active in this respect. Preparation of S-benzyldithiocarbazateThis compound was prepared by the method of Bähr and Schleitzer[8], Since their details are rather brief and conditions for a high yield are critical, the method is given here in detail. Potassium hydroxide (28.5 g) was completely dissolved in alcohol (135 ml)-water (15 ml) mixture and the mixture was cooled in ice. To the solution hydrazine hydrate (25 g) was added slowly with stirring. A solution of carbon disulphide (36.5 g) in alcohol (30 ml) was then added dropwise from a burette, with constant stirring, over a period of Ihr. The temperature of the mixture was kept below 10 °C during the addition. The resulting yellow oil was separated by means of a separatory funnel and dissolved in alcohol (48 ml)-water (72 ml) mixture and this solution was cooled in ice. Benzyl chloride (62.16 g) was then added slowly with vigorous mechanical stirring; after the addition the mixture was stirred for a further 10 minutes while a white product separated. Ice-cooled water (100 ml) was and then added the stirring was continued for another 10 minutes. 5Brought to you by | Purdue University Libraries

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