Specific Molecular Motion of Adamantane Induced by Hydrophobic Nanoslits in ACF as Studied Using Solid-State 1H, 2H, and 13C NMR

Molecular motion of adamantane confined in activated carbon fiber (ACF) with slit-width of 1.1 nm was investigated using solid state 1 H, 2 H, and 13 C NMR analyses. Temperature dependence of the 2 H spin-lattice relaxation time revealed that adamantane undergoes rapid isotropic reorientation in ACF...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Pa. : 2003), 2008-09, Vol.490 (1), p.91-105
Main Authors: Omichi, Hiroaki, Ueda, Takahiro, Chen, Yu, Miyakubo, Keisuke, Eguchi, Taro
Format: Article
Language:English
Subjects:
activated carbon fiber
adamantane
molecular motion
solid state NMR
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Summary:Molecular motion of adamantane confined in activated carbon fiber (ACF) with slit-width of 1.1 nm was investigated using solid state 1 H, 2 H, and 13 C NMR analyses. Temperature dependence of the 2 H spin-lattice relaxation time revealed that adamantane undergoes rapid isotropic reorientation in ACF that is much faster than in bulk plastic crystal. Temperature dependence of the line width of the 1 H NMR spectrum also suggests that adamantane undergoes translational motion in ACF. The single minimum potential profile between adamantane and the pore wall might engender the high mobility of guest adamantane molecules as a "two-dimensional fluid."
ISSN:1542-1406
1563-5287
1543-5318
DOI:10.1080/15421400802305772