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Volumn 112, Issue 3, 2008, Pages 839-847

Structural properties of low-temperature phase transitions in the prototypical thiourea inclusion compound: Cyclohexane/thiourea

Author keywords

[No Author keywords available]

Indexed keywords

CYCLOHEXANE; HYDROGEN BONDS; MOLECULAR STRUCTURE; PHASE TRANSITIONS; RIETVELD REFINEMENT; X RAY DIFFRACTION;

EID: 38849105449     PISSN: 19327447     EISSN: 19327455     Source Type: Journal    
DOI: 10.1021/jp076706y     Document Type: Article
Times cited : (13)

References (29)
  • 1
    • 0003935343 scopus 로고
    • Mandelcom, L, Ed, Academic Press: New York
    • Fetterly, L. C. Non-Stoichiometric Compounds; Mandelcom, L., Ed.; Academic Press: New York, 1964; p 491.
    • (1964) Non-Stoichiometric Compounds , pp. 491
    • Fetterly, L.C.1
  • 2
    • 0002904716 scopus 로고
    • Atwood, J. L, Davies, J. E. D, MacNicol, D. D, Eds, Academic Press: New York
    • Takemoto, K.; Sonoda, N. Inclusion Compounds; Atwood, J. L., Davies, J. E. D., MacNicol, D. D., Eds.; Academic Press: New York, 1984; Vol. 2, p 47.
    • (1984) Inclusion Compounds , vol.2 , pp. 47
    • Takemoto, K.1    Sonoda, N.2
  • 3
    • 0000333462 scopus 로고    scopus 로고
    • Atwood, J. L, Davies, J. E. D, MacNicol, D. D, Vögtle, F, Eds, Pergamon Press: Oxford
    • Hollingsworth, M. D.; Harris, K. D. M. Comprehensive Supramolecular Chemistry; Atwood, J. L., Davies, J. E. D., MacNicol, D. D., Vögtle, F., Eds.; Pergamon Press: Oxford, 1996; Vol. 6, pp 177-237.
    • (1996) Comprehensive Supramolecular Chemistry , vol.6 , pp. 177-237
    • Hollingsworth, M.D.1    Harris, K.D.M.2
  • 25
    • 38849139732 scopus 로고    scopus 로고
    • It is noteworthy that the powder X-ray diffraction pattern shown in Figure 2 for phase III does not show evidence for pure solid cyclohexane, whereas the powder X-ray diffraction patterns shown in Figure 2 for phases I and II do show evidence for pure solid cyclohexane. In this regard, we recall that the powder X-ray diffraction pattern shown in Figure 2 for phase III was recorded for a different sample from that used to record the data for phases I and II. It is reasonable to propose that partial decomposition of the inclusion compound occurs while handling the material at higher temperatures, prior to cooling in the X-ray powder diffraction experiments, producing solid thiourea and liquid cyclohexane. The fact that in some cases no pure solid cyclohexane is observed (e.g, phase III discussed here) may be due to vaporization of the liquid cyclohexane decomposition product prior to cooling in the X-ray powder diffraction experiments
    • It is noteworthy that the powder X-ray diffraction pattern shown in Figure 2 for phase III does not show evidence for pure solid cyclohexane, whereas the powder X-ray diffraction patterns shown in Figure 2 for phases I and II do show evidence for pure solid cyclohexane. In this regard, we recall that the powder X-ray diffraction pattern shown in Figure 2 for phase III was recorded for a different sample from that used to record the data for phases I and II. It is reasonable to propose that partial decomposition of the inclusion compound occurs while handling the material at higher temperatures, prior to cooling in the X-ray powder diffraction experiments, producing solid thiourea and liquid cyclohexane. The fact that in some cases no pure solid cyclohexane is observed (e.g., phase III discussed here) may be due to vaporization of the liquid cyclohexane decomposition product prior to cooling in the X-ray powder diffraction experiments.


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