Add time:09/10/2019         Source:sciencedirect.com

The standard (p°=0.1 MPa) molar enthalpies of formation ΔfHm°(cr) atT=298.15 K were determined using static-bomb calorimetry for crystalline 4-methylpyridine N-oxide (4MePyNO), 3-cyanopyridine N-oxide (3CNPyNO), 4-cyanopyridine N-oxide (4CNPyNO), 3-hydroxypyridine N-oxide (3OHPyNO), 2-pyridinecarboxylic acid N-oxide (2CO2HPyNO), 4-pyridinecarboxylic acid N-oxide (4CO2HPyNO), 3-methyl-4-nitropyridine N-oxide (3Me4NO2PyNO), 2-pyridinecarboxylic acid (2CO2HPy), and 4-pyridinecarboxylic acid (4CO2HPy). The standard molar enthalpies of sublimation ΔcrgHm° atT=298.15 K were measured by microcalorimetry, or by a mass-loss effusion technique, and from the enthalpies of formation of the gaseous compounds the dissociation enthalpiesDm° of the (N+-O−) dative covalent bonds were derived.Comparison has been made withDm°(N-O) values in pyridine N-oxide derivatives.

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