Experimental and Theoretical Thermochemistry of the Isomers 3- and 4-Nitrophthalimide
| Autor: | Francisco J. Melendez, Karina Salas-López, Patricia Amador, Henoc Flores, Aarón Rojas |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Phthalic anhydride
010405 organic chemistry Enthalpy Ab initio 010402 general chemistry 01 natural sciences Standard enthalpy of formation 0104 chemical sciences Phthalimide chemistry.chemical_compound chemistry Thermochemistry Physical chemistry Sublimation (phase transition) Physical and Theoretical Chemistry Isomerization |
| Zdroj: | The journal of physical chemistry. A. 121(29) |
| ISSN: | 1520-5215 |
| Popis: | This work presents a thermochemical study of two derivatives of phthalimide: the isomers 3-nitrophthalimide and 4-nitrophthalimide. The enthalpies of formation for these compounds in the solid phase were obtained by combustion calorimetry. Using ths thermogravimetry technique, the enthalpies of vaporization were obtained. The enthalpies of sublimation were calculated from enthalpies of fusion and vaporization. From experimental data and by ab initio methods, the enthalpies of formation in the gas phase were calculated. With these results, it was possible to determine their relative stability, and it was found that 4-nitrophthalimide is more stable than its isomer 3-nitrophthalimide. This tendency is similar to that of 3-nitrophthalic anhydride and 4-nitrophthalic anhydride, as reported in a previous work by our research group. The enthalpy of isomerization was also obtained, and a good correlation with that of phthalic anhydride derivatives was found. Finally, with the values obtained, the enthalpic difference resulting when the imide group is substituted by an anhydride group was determined. |
| Databáze: | OpenAIRE |
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