Zinc–sulphur bond enthalpy: its determination in the compound bis(diethyldithiocarbamato)zinc(II)

Abstract

The standard enthalpy of formation of bis(diethyldithiocarbamato)zinc(II), as well as that of the salt diethylammonium chloride, has been determined by solution calorimetry at 298.15 K, giving –(289.65 ± 4.9) and –(359.63 ± 1.22) kJ mol^–1, respectively. From the standard enthalpy of formation of the chelare, the enthalpy of formation in the gaseous phase, ΔH_f^⊖[Zn(S₂CNEt₂)₂,g]=–(147.0 ± 5.0) kJ mol^–1 was derived. The homolytic and heterolytic zinc–sulphur bond enthalpy parameters were calculated to be 177.4 ± 3.5 and 740.2 ± 3.5 kJ mol^–1, respectively. These values are discussed and appear to correlate with the zinc–sulphur bond distance.