Thermochemical Study of 1-Methylhydantoin

Molecules

Juan M. Ledo¹  Henoc Flores²  Elsa A. Camarillo²  Fernando Ramos² 

[1] Complejo Regional Mixteca, Campus Izúcar de Matamoros, Benemérita Universidad Autónoma de Puebla. Carr, Atlixco-Izúcar de Matamoros 141, San Martín Alchichica, Izúcar de Matamoros C.P., 74570 Puebla, Mexico;Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 14 sur y Avenida San Claudio, Puebla C.P., 72570 Puebla, Mexico;

关键词: energy of combustion;    enthalpy of formation;    hydantoins;    enthalpy of sublimation;   

DOI  :  10.3390/molecules27020556

来源: DOAJ

【 摘 要 】

Using static bomb combustion calorimetry, the combustion energy of 1-methylhydantoin was obtained, from which the standard molar enthalpy of formation of the crystalline phase at T = 298.15 K of the compound studied was calculated. Through thermogravimetry, mass loss rates were measured as a function of temperature, from which the enthalpy of vaporization was calculated. Additionally, some properties of fusion were determined by differential scanning calorimetry, such as enthalpy and temperature. Adding the enthalpy of fusion to the enthalpy of vaporization, the enthalpy of sublimation of the compound was obtained at T = 298.15 K. By combining the enthalpy of formation of the compound in crystalline phase with its enthalpy of sublimation, the respective standard molar enthalpy of formation in the gas phase was calculated. On the other hand, the results obtained in the present work were compared with those of other derivatives of hydantoin, with which the effect of the change of some substituents in the base heterocyclic ring was evaluated.

【 授权许可】

Unknown