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• W2088764222 abstract "The standard (p∘ = 0.1 MPa) molar energy of combustion, at T = 298.15 K, of crystalline 2,3-dicyanopyrazine was measured by static bomb calorimetry, in oxygen atmosphere. The standard molar enthalpy of sublimation, at T = 298.15 K, was obtained by Calvet Microcalorimetry, allowing the calculation of the standard molar enthalpy of formation of the compound, in the gas phase, at T = 298.15 K: ΔfHm∘ (g) = (518.7 ± 3.4) kJ · mol−1. In addition, the geometries of all cyanopyrazines were obtained using density functional theory with the B3LYP functional and two basis sets: 6-31G* and 6-311G**. These calculations were then used for a better understanding of the relation between structure and energetics of the cyanopyrazine systems. These calculations also reproduce measured standard molar enthalpies of formation with some accuracy and do provide estimates of this thermochemical parameter for those compounds that could not be studied experimentally, namely the tri- and tetracyanopyrazines: the strong electron withdrawing cyano group on the pyrazine ring makes cyanopyrazines highly destabilized compounds." @default.
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• W2088764222 date "2006-05-01" @default.
• W2088764222 modified "2023-10-17" @default.
• W2088764222 title "Thermochemical study of cyanopyrazines: Experimental and theoretical approaches" @default.
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• W2088764222 doi "https://doi.org/10.1016/j.jct.2005.07.006" @default.
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