Enthalpies of combustion and formation of 3-formylchromones

• Published in: Thermochimica acta Vol. 450; no. 1; pp. 35 - 37
• Main Authors: Flores, Henoc, López, Yessica I., Amador, Patricia
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.2006; Elsevier Science
• Subjects: 3-Formylchromones; Chemical thermodynamics; Chemistry; Elements, mineral and organic compounds; Enthalpies of formation; Exact sciences and technology; General and physical chemistry; Micro-combustion calorimeter; Thermodynamic properties; 3-Formylchromones; Enthalpies of formation; Micro-combustion calorimeter; Heat of combustion; Calorimeter; Chromone derivatives; Formation free energy; Combustion; Aldehyde; Oxygen heterocycle; Thermodynamic properties
• ISSN: 0040-6031; 1872-762X
• DOI: 10.1016/j.tca.2006.07.010

The enthalpies of combustion of 3-formylchromone (3F), 3-formyl-6-methylchromone (3F6M) and 3-formyl-6-isopropylchromone (3F6I) were determined by combustion calorimetry. The molar combustion energies ( Δ c U m 0   ( cr, 298.15   K ) ) of the 3F, 3F6M and 3F6I are: −(4452.4 ± 1.8), −(5115.6 ± 2.7) and −(6411.4 ± 2.5) kJ mol −1, respectively. The formation enthalpies in the crystalline state ( Δ f H m °   ( cr, 298.15   K ) ) are: −(340.2 ± 2.2), −(355.1 ± 3.1) and −(415.5 ± 3.0) kJ mol −1, respectively.s