Phase diagrams of urea inclusion compounds
- 95 Downloads
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.
Keywordsbinary systems inclusion compounds stearic acid urea
Unable to display preview. Download preview PDF.
- 1.M. Kuhnert-Brandstätter and A. Burger, Pharmazie, 51 (1996) 288.Google Scholar
- 3.M. Kuhnert-Brandstätter, unpublished.Google Scholar
- 4.L. Kofler and A. Kofler, Thermomikromethoden, Universitätsverlag Wagner, Innsbruck 1954.Google Scholar
- 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.M. Kuhnert-Brandstätter, Thermomicroscopy in the Analysis of Pharmaceuticals, Pergamon Press, Oxford 1971.Google Scholar
- 9.L. Deffet, Répertoire des Composés organiques polymorphes, Editions Desoer, Liège 1942.Google Scholar
- 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