Abstract
The standard (p° = 0.1 MPa) molar enthalpy of sublimation of form I nicotinamide (NIC, cr I), at 298.15 K, was determined by drop-sublimation Calvet microcalorimetry. Experiments carried out under isothermal and non-isothermal conditions led to ΔsubHmo(NIC, cr I) = 108.0 ± 0.5 kJ·mol−1. The present study allowed to resolve to a significant extent the large discrepancy observed between published ΔsubHmo(NIC) results obtained by calorimetry and by vapor-pressure measurements, using samples of unspecified crystal form.
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