Abstract
The standard (p 0=0.1 MPa) molar enthalpies of formation, in the condensed phase, of nine linear-alkyl substituted thiophenes, six in position 2- and three in position 3-, at T=298.15 K, were derived from the standard massic energies of combustion, in oxygen, to yield CO2(g) and H2SO4·115H2O(aq), measured by rotating-bomb combustion calorimetry. The standard molar enthalpies of vaporization of these compounds were measured by high temperature Calvet Microcalorimetry, so their standard molar enthalpies of formation, in the gaseous phase, were derived.
The results are discussed in terms of structural contributions to the energetics of the alkyl-substituted thiophenes, and empirical correlations are suggested for the estimation of the standard molar enthalpies of formation, at T=298.15 K, for 2- and 3-alkyl-substituted thiophenes, both in the condensed and in the gaseous phases.
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Ribeiro da Silva, M.A.V., Santos, A.F.L.O.M. Thermochemical study of 2- and 3-alkyl substituted thiophenes. J Therm Anal Calorim 88, 7–17 (2007). https://doi.org/10.1007/s10973-006-8326-3
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DOI: https://doi.org/10.1007/s10973-006-8326-3