Abstract
Thermodynamic data have been obtained by calorimetric titration in benzene solution at 30°C for reacton of Lewis bases with bis(ethane-1,2-dithiolato)tin(IV) (SnS4). Unidentate bases form simultaneously 1:1 and 1:2 adducts with SnS4, and bidentate bases form 1:1 adducts. The enthalpies of formation of the 1,10-phen adducts are similar to those of 1:2 adducts with py or 4-mepy and the stability of the TMEN adducts is similar to 1:2 adducts of piperidine with similar enthalpies of formation. Pyridine N-oxide is the only non-nitrogen donor observed to form 1:2 adducts with smaller enthalpy changes but a rather big equilibrium constant, due to the smaller steric effect of the pointed NO ligand. The Lewis acidity of Sn(IV) compounds is according to the following order: Ph2SnS2<SnS4<SnI4< SnCl4.
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