@article {3277,
	title = {GUEST DYNAMICS IN CARCEPLEXES - A H-2 NMR-STUDY},
	journal = {Journal of the Chemical Society-Faraday Transactions},
	volume = {91},
	number = {22},
	year = {1995},
	note = {ISI Document Delivery No.: TF186Times Cited: 8Cited Reference Count: 24},
	month = {Nov},
	pages = {4127-4131},
	type = {Article},
	abstract = {Solid-state H-2 NMR powder spectra and T-1 longitudinal relaxation data have been collected for carceplexes containing benzene and acetonitrile guest molecules. Analysis of the data suggests that benzene rotates rapidly about its C-6 axis with an activation energy of 25.8 +/- 0.4 kJ mol(-1). In addition, it reorients about the C-4 axis of the carceplex cavity with a rate (ca. 10(6)-10(7) s(-1)) that is in the intermediate regime on the H-2 NMR spectral timescale in the temperature range T = 310-400 K. Lineshape simulations suggest that this reorientation has less than four-fold symmetry owing to unequal site populations, probably a reflection of the deviation from C-4 symmetry of the carceplex geometry. Acetonitrile reorients rapidly (much greater than 10(5) s(-1)) about a four-fold symmetric axis for T greater than or equal to 181 K.},
	keywords = {benzene, COMPLEXATION, MOTIONS, RESONANCE LINE-SHAPES, SOLIDS, SPECTROSCOPY},
	isbn = {0956-5000},
	url = {<Go to ISI>://A1995TF18600015},
	author = {Chopra, N. and Chapman, R. G. and Chuang, Y. F. and Sherman, J. C. and Burnell, E. E. and Polson, J. M.}
}
