Thermochimica Acta, 68 (1983) 121-123 Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands 121 zyxwvutsrqp Note THERMAL BEHAVIOUR OF THE THIURAMDISULPHIDE COMPLEX OF THORIUM(IV) NITRATE A.K. SRIVASTAVA Chemistry Department, Meerut College, Meerut 250006 (India) R.K. AGARWAL * Chemistry Department, L. R. College, Sahibabad - 201005 (India) (Received 22 March 1983) Thiuram sulphides are well-known rubber vulcanisation accelerators. A number of papers [l-3] have been published in recent years on the coordina- tion compounds of thiurams with transition metals. Thorium(W) complexes of sulphur-donor ligands are relatively very rare; to our knowledge, only one complex of thorium(IV) of dithiocarbamate has been reported [4]. In the present note, isolation, characterisation and thermal behaviour of the thorium(IV) complex of tetramethylthiuramdisulphide (TMTDS) is reported. Elemental analyses of the white complex agree well with the formula Th(NO,), . C,H,,N,S,. The conductivity measurements in acetonitrile indi- cate the typical behaviour of a non-electrolyte. As expected [5], the complex is diamagnetic. The assignments of infrared spectral bands were made by comparison with previously reported thiuram complexes [ 1,3]. The thiuram complexes show four important bands in the 1500800 cm-’ region [ 11; (a) a strong band at about 1500 cm- I, called the “ thiureide band”, (b) a band located at about 1280-1240 cm-’ due to C-N vibration of the alkyl group, (c) a weak band at about 1000-970 cm-’ which corresponds to the C=S stretching mode, and (d) a weak band at 860-820 cm-’ due to the C-S stretching mode. In the complex Th(NO,), . C,H,,N,S,, bands are observed at 1510, 1250 and 970 cm-’ which have been assigned to (a), (b) and (c), respectively. The corresponding bands in the free ligand are at 1495, 1240, and 960 cm-‘. The band observed at about 860 cm-’ (due to C-S stretching) in the free ligand, does not appear in the complex. The presence of a bicovalent nitrate group in the complex is indicated by the appearance of bands at 1495 ( vq), 1290 (v,), 1030 (q), 810 (Q) and 730 cm-’ (YJY~) [6-81. The Th-S stretching band is observed at 350 and 340 cm-’ [4]. The overall infrared * To whom correspondence should be addressed. 0040-6031/83/$03.00 0 1983 Elsevier Science Publishers B.V.