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Experimental thermochemical study of two polymethylpyrazine N,N′-dioxide derivatives |
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| Authors: | Maria D.M.C. Ribeiro da Silva, M nica A.A. Vieira, Chelsea Givens, Stephanie Keown,William E. Acree Jr. |
| Affiliation: | aCentro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal bDepartment of Chemistry, University of North Texas, Denton, TX 76203-5070, USA |
| Abstract: | The standard (p° = 0.1 MPa) molar enthalpies of formation of crystalline 2,3,5-trimethylpyrazine-1,4-dioxide and 2,3,5,6-tetramethylpyrazine-1,4-dioxide were measured, at T = 298.15 K, by static bomb calorimetry and the standard molar enthalpies of sublimation, at T = 298.15 K, were obtained from Calvet microcalorimetric measurements. These values were used to derive the respective standard molar enthalpies of formation in gaseous phase. The mean N–O bond dissociation enthalpy has been calculated for both compounds. |
| Keywords: | Polyalkylsubstituted pyrazine N,N-dioxides 2,3,5-Trimethylpyrazine-1,4-dioxide 2,3,5,6-Tetramethylpyrazine-1,4-dioxide Enthalpy of sublimation Enthalpy of formation Mean N–O bond dissociation enthalpy |
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