Standard molar enthalpies of formation in the crystalline phase of 7-hydroxy-4-methylcoumarin, 7-ethoxy-4-methylcoumarin, and 6-methoxy-4-methylcoumarin (original) (raw)

The Journal of Chemical Thermodynamics, 2011

Abstract

The standard molar energies of combustion, ΔcUm∘ (cr, 298.15K) of 7-hydroxy-4-methylcoumarin, 7-ethoxy-4-methylcoumarin, and 6-methoxy-4-methylcoumarin were obtained by combustion calorimetry. The experimental values are (−4536.4±2.2), (−5888.0±3.2), and (−5267.3±2.3)kJ·mol−1, respectively. From these values, the standard molar enthalpies of formation in the crystalline phase were calculated and found to be (−540.8±2.6), (−545.4±3.6), and (−488.0±2.7)kJ·mol−1, respectively.

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