Phase transition and molecular motion of cyclohexane confined in metal-organic framework, IRMOF-1, as studied by 2H NMR

Molecular motion and thermal properties of cyclohexane confined in [Zn 4O(O 2CC 6H 4CO 2) 3] n (IRMOF-1) were examined using 2H NMR and DTA measurements Molecular motion and thermal properties of cyclohexane confined in [Zn 4O(O 2CC 6H 4CO 2) 3] n (IRMOF-1) were examined using 2H NMR and differentia...

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Published in:Chemical physics letters 2007-08, Vol.443 (4), p.293-297
Main Authors: Ueda, Takahiro, Kurokawa, Kenji, Omichi, Hiroaki, Miyakubo, Keisuke, Eguchi, Taro
Format: Article
Language:English
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Summary:Molecular motion and thermal properties of cyclohexane confined in [Zn 4O(O 2CC 6H 4CO 2) 3] n (IRMOF-1) were examined using 2H NMR and DTA measurements Molecular motion and thermal properties of cyclohexane confined in [Zn 4O(O 2CC 6H 4CO 2) 3] n (IRMOF-1) were examined using 2H NMR and differential thermal analysis (DTA) measurements. DTA measurement revealed that cyclohexane confined in IRMOF-1 exhibits thermal anomaly at 121 K, 213 K and 306 K. Subsequent 2H NMR elucidated that cyclohexane undergoes precession of the C 3-axis at temperatures below 120 K and shows a tumbling motion with the large amplitude fluctuation of the precession axis from 120 K to 200 K; then isotropic reorientation is excited at temperatures above 200 K, revealing that cyclohexane in IRMOF-1 melts at 213 K.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2007.06.115