Thermochemical studies on five N-thenoylthiocarbamic-O-n-alkylesters

The standard (p∘ = 0.1 MPa) molar enthalpies of combustion in oxygen of five N-thenoylthiocarbamic-O-n-alkylesters, C4H3SCONHCSOR, R = Et (Httee), n-Pr (Httpe), n-Bu (Httbe), n-Pen (Httpene), and n-Hex (Htthe), were measured, at T = 298.15 K, by rotating-bomb calorimetry. The standard molar enthalpies of sublimation of these compounds were determined using Calvet microcalorimetry. These values were used to derive the standard molar enthalpies of formation of the title compounds, in their crystalline and gaseous phases, respectively. Furthermore, differential scanning calorimetry was applied in order to measure the temperatures and enthalpies of fusion for all compounds. Entropies of fusion were derived from the experimental results and the odd and even effect was found.-ΔcUm∘(cr)kJ·mol-1-ΔfHm∘(cr)kJ·mol-1ΔcrgHm∘kJ·mol-1N-thenoylthiocarbamic-O-ethylester (Httee)5303.5±3.1325.5±3.3143.2±3.1N-thenoylthiocarbamic-O-n-propylester (Httpe)5980.3±2.5326.8±2.8136.5±1.8N-thenoylthiocarbamic-O-n-butylester (Httbe)6636.8±2.5348.5±2.9147.5±1.9N-thenoylthiocarbamic-O-n-pentylester (Httpene)7284.5±3.8378.7±4.0165.6±2.1N-thenoylthiocarbamic-O-n-hexylester (Htthe)7937.6±3.8403.7±4.2180.1±3.0Full-size tableTable optionsView in workspaceDownload as CSV