Issue 7, 1992

Thermochemical features of di-n-propyldithiocabamate chelates of zinc-group elements

Abstract

Solution-reaction calorimetry was used to determine the standard molar enthalpy of formation at 298.15 K of crystalline [M(S2CNPrn2)2](M = Zn, Cd or Hg): –440.68 ± 2.85, –396.71 ± 2.60 and –240.50 ± 2.40 kJ mol–1, respectively. The enthalpies of sublimation, 147 ± 2, 199 ± 1 and 200 ± 2 kJ mol–1, were estimated by means of differential scanning calorimetry. From the standard molar enthalpies of formation of the gaseous chelates, –294 ± 4, –198 ± 3 and –41 ± 3 kJ mol–1, the homolytic 182 ± 3, 154 ± 3 and 102 ± 3 kJ mol–1 and heterolytic 745 ± 3, 681 ± 3 and 709 ± 3 kJ mol–1 mean metal-sulfur bond enthalpies were calculated. The homolytic enthalpies decrease from zinc to mercury and are dependent on the nature of the radical attached to the nitrogen of the ligand.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1992, 1235-1238

Thermochemical features of di-n-propyldithiocabamate chelates of zinc-group elements

M. A. R. P. de Carvalho, C. Airoldi and A. G. de Souza, J. Chem. Soc., Dalton Trans., 1992, 1235 DOI: 10.1039/DT9920001235

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