Standard molar enthalpies of formation of 2-, 3-, and 4-piperidinomethanol isomers

The standard (p∘ = 0.1 MPa) molar energies of combustion in oxygen of 2-piperidinemethanol, 3-piperidinemethanol, and 4-piperidinemethanol, all in the crystalline phase, were measured, at T = 298.15 K, by static bomb calorimetry. These values were used to derive the standard molar enthalpies of combustion and the standard molar enthalpies of formation, in the condensed phase, for these compounds.Further, the standard molar enthalpies of sublimation, at T = 298.15 K, of these three piperidinomethanol isomers were determined by Cavet microcalorimetry.The combustion calorimetry results together with those from the Calvet microcalorimetry, were used to derive the standard molar enthalpies of formation, at T = 298.15 K, in the gaseous phase, of the three piperidinemethanol studied. -ΔcHm∘(cr)ΔcrgHm∘kJ · mol−1kJ · mol−12-Piperidinemethanol3890.70±0.9293.02±0.503-Piperidinemethanol3895.3±1.195.9±1.44-Piperidinemethanol3891.3±1.198.31±0.69Full-size tableTable optionsView in workspaceDownload as CSV