Journal of Thermal Analysis and Calorimetry

, Volume 83, Issue 3, pp 533–539 | Cite as

Thermochemical studies of phthalimide and two N-alkylsubstituted phthalimides (ALKYL=ETHYL AND n-PROPYL)

  • Ribeiro da Silva M. A. V. Email author
  • Santos C. P. F. 
  • Monte M. J. S. 
  • Sousa C. A. D. 


The standard (p0=0.1 MPa) molar enthalpies of formation, ΔfHm0, for crystalline phthalimides: phthalimide, N-ethylphthalimide and N-propylphthalimide were derived from the standard molar enthalpies of combustion, in oxygen, at the temperature 298.15 K, measured by static bomb-combustion calorimetry, as, respectively, – (318.0±1.7), – (350.1±2.7) and – (377.3±2.2) kJ mol–1. The standard molar enthalpies of sublimation, ΔcrgHm0, at T=298.15 K were derived by the Clausius-Clapeyron equation, from the temperature dependence of the vapour pressures for phthalimide, as (106.9±1.2) kJ mol–1 and from high temperature Calvet microcalorimetry for phthalimide, N-ethylphthalimide and N-propylphthalimide as, respectively, (106.3±1.3), (91.0±1.2) and (98.2±1.4) kJ mol–1.

The derived standard molar enthalpies of formation, in the gaseous state, are analysed in terms of enthalpic increments and interpreted in terms of molecular structure.


combustion calorimetry Knudsen effusion N-ethylphthalimide N-propylphthalimide phthalimide standard molar enthalpy of formation standard molar enthalpy of sublimation  vapour pressures 


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Ribeiro da Silva M. A. V. 
    • 1
    Email author
  • Santos C. P. F. 
    • 1
  • Monte M. J. S. 
    • 1
  • Sousa C. A. D. 
    • 1
  1. 1.Centro de Investigação em Química, Department of Chemistry, Faculty of ScienceUniversity of Porto Rua do Campo Alegre, 687PortoPortugal

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