Standard molar enthalpies of formation in the crystalline phase of 7-hydroxy-4-methylcoumarin, 7-ethoxy-4-methylcoumarin, and 6-methoxy-4-methylcoumarin
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Add time:09/10/2019 Source:sciencedirect.com
The standard molar energies of combustion, ΔcUm∘ (cr, 298.15 K) 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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