Heat capacities of THIANE (cas 1413-51-0) sulfones and THIANE (cas 1413-51-0) sulfoxide: Refining of Cp group values for organosulfur compounds and their oxides

Add time:09/26/2019    Source:sciencedirect.com

A thermophysical study of THIANE (cas 1413-51-0) sulfone, 1; 1,3-dithiane sulfone, 2; and 1,3-dithiane sulfoxide, 3 in the temperature intervals between T=268 K and their respective melting temperatures has been carried out. The experimental values for the mole fraction, temperature, enthalpy and entropy of fusion and the associated standard deviation as determined by differential scanning calorimetry (DSC) are x = (0.9996±0.0001), Tfus=(370.8±0.1) K, ΔfusHm=(18.4±0.2) kJ mol−1, ΔfusSm=(49.6±0.5) J mol−1 K−1 for thiane sulfone, 1; x = (0.9994±0.0001), Tfus=(414.0±0.2) K, ΔfusHm=(22.0±0.2) kJ mol−1, ΔfusSm=(53.1±0.4) J mol−1 K−1 for 1,3-dithiane sulfone, 2; and x = (0.9977±0.0001), Tfus=(361.9±0.1) K, ΔfusHm=(22.6±0.2) kJ mol−1, ΔfusSm=(62.4±0.5) J mol−1 K−1 for 1,3-dithiane sulfoxide, 3. Heat capacities in those temperature intervals and in condensed state were measured and no additional solid–solid phase transitions were observed. The heat capacities at T=298.15 K were used to refine group values for organosulfur compounds and their oxides.

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