Journal of thermal analysis

, Volume 50, Issue 4, pp 559–567 | Cite as

Phase diagrams of urea inclusion compounds

2. Stearic acid and urea
  • Maria Kuhnert-Brandstätter
  • A. Burger


The stearic acid-urea binary system exhibits an unusual phase diagram, which, on the one hand, indicates an incongruently melting inclusion compound and on the other hand a miscibility gap in the liquid phases. The peritectic point lies near the melting point of urea and the unstable congruent melting point of the inclusion compound coincides with the melting point of urea. In addition to the processing of the phase diagram, the pure inclusion compound was prepared and its DSC curve, FTIR spectrum and X-ray diffractogram were recorded.


binary systems inclusion compounds stearic acid urea 


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  1. 1.
    M. Kuhnert-Brandstätter and A. Burger, Pharmazie, 51 (1996) 288.Google Scholar
  2. 2.
    W. Schlenck jr., Organische Einschlußverbindungen in: Fortschritte der chemischen Forschung, Vol. 2, Springer Verlag, Berlin, Göttingen, Heidelberg 1951, p. 92.CrossRefGoogle Scholar
  3. 3.
    M. Kuhnert-Brandstätter, unpublished.Google Scholar
  4. 4.
    L. Kofler and A. Kofler, Thermomikromethoden, Universitätsverlag Wagner, Innsbruck 1954.Google Scholar
  5. 5.
    M. Kuhnert-Brandstätter, Thermomicroscopy of Organic Compounds in: Wilson and Wilson's Comprehensive Analytical Chemistry, Vol. XVI (Gy. Svehla, ed.) Elsevier, Amsterdam 1982, p. 329.Google Scholar
  6. 6.
    M. Kuhnert-Brandstätter, Thermomicroscopy in the Analysis of Pharmaceuticals, Pergamon Press, Oxford 1971.Google Scholar
  7. 7.
    M. Kuhnert-Brandstätter and U. J. Griesser, J. Thermal Anal., 45 (1995) 559.CrossRefGoogle Scholar
  8. 8.
    A. Burger, J.-O. Henck and M. N. Dünser, Microchim. Acta, 122 (1996) 247.CrossRefGoogle Scholar
  9. 9.
    L. Deffet, Répertoire des Composés organiques polymorphes, Editions Desoer, Liège 1942.Google Scholar
  10. 10.
    K. Sato and M. Kobayashi, Structure, Stability and Crystal Growth of Polymorphs and Polytypes of Long-Chain Aliphatic Compounds in: Organic Crystals I, Springer-Verlag, Berlin, Heidelberg 1991, p. 65.Google Scholar

Copyright information

© Akadémiai Kiadó 1997

Authors and Affiliations

  • Maria Kuhnert-Brandstätter
    • 1
  • A. Burger
    • 1
  1. 1.Institute of PharmacognosyUniversity of InnsbruckInnsbruckAustria

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