Add time:08/06/2019 Source:sciencedirect.com
The standard (p∘ = 0.1 MPa) molar energies of combustion in oxygen of 2-thiophenecarbonitrile, 3-thiophenecarbonitrile, 2-thiopheneacetonitrile, 3-thiopheneacetonitrile, and 3-methyl-2-thiophenecarbonitrile were measured, at T = 298.15 K, by rotating-bomb calorimetry. The standard molar enthalpies of vaporization of these compounds at T = 298.15 K were determined using high temperature 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. Compounds-ΔcUm∘(l)/(kJ · mol−1)-ΔfHm∘(l)/(kJ · mol−1)ΔlgHm∘/(kJ · mol−1)2-Thiophenecarbonitrile3192.4 ± 1.4198.5 ± 1.649.5 ± 1.13-Thiophenecarbonitrile3190.9 ± 1.3197.0 ± 1.451.6 ± 1.92-Thiopheneacetonitrile3839.6 ± 1.6167.6 ± 1.860.5 ± 1.33-Thiopheneacetonitrile3838.8 ± 1.7166.7 ± 1.861.1 ± 1.33-Methyl-2-thiophenecarbonitrile3829.6 ± 1.6157.6 ± 1.754.4 ± 1.2
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