Arturo Ximello - The standard molar enthalpies of formation of chromone-3- carboxylic acid, 6-methylchromone-2-carboxylic acid, and 6-methyl-4-chromanone determined by micro-combustion calorimetry

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      Keywords: Micro-combustion calorimetry. Combustion   energies. Enthalpies of formation. Chromone-3- carboxylic acid.   6-Methylchromone-2-carboxylic acid.   6-Methyl-4-chromanone.

      DOI:   10.1007/s10973-014-3675-9



      The energies of combustion of chromone-3- carboxylic acid   (C3CA), 6-methylchromone-2-carboxylic acid (6MCC), and   6-methyl-4-chromanone (6M4C) were determined using an   isoperibolic micro-combustion calorimeter. The calorimeter   used in the present work has been assembled, calibrated, and   tested in our laboratory with the desired results. Prior to   the measurement of the energies of combustion, the purities,   heat capacities, fusion temperatures, and enthalpies of melting   for each compound were determined by differential scanning   calorimetry. The values of the energies of combustion were   used to derive standard molar enthalpies of combustion and   standard molar enthalpies of formation in the crystalline   phase at T = 298.15 K. The values found for the   formation enthalpies of C3CA, 6MCC, and 6M4C were -(619.5 ±   2.6), -(656.2 ± 2.2), and -(308.9 ± 3.0) kJ   mol-1, respectively.

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