@article {4523, title = {Can global target analysis of the splitting and spin relaxation from a ring-deuterated mesogen produce dynamical information?}, journal = {Molecular Crystals and Liquid Crystals Science and Technology Section a-Molecular Crystals and Liquid Crystals}, volume = {331}, year = {1999}, note = {ISI Document Delivery No.: 241JCTimes Cited: 0Cited Reference Count: 2017th International Liquid Crystal ConferenceJUL 19-24, 1998STRASBOURG, FRANCECaisse Epargne, CNRS, Conseil Gen Bas Rhin, France Telecom, Gordon \& Breach Publishing Grp, Instec Inc, Inst Phys Chimie Materiaux Strasbourg, Reg ALSACE, Rolic Liquid Crystals R\&D Co, STOE \& CIE GmbH, Univ Louis Pasteur, Ville Strasbourg, Int Liquid Crystal Soc, Ecole Chimie, Polymeres Materiaux Strasbourg, Lab Fluides Complexex, Inst Charles SadronPart 4}, pages = {2003-2013}, type = {Proceedings Paper}, abstract = {We report on the measurements of quadrupolar splitting and spectral densities of motion for the phenylthio ring deuterons as a function of temperature in 4-pentylphenylthio-4{\textquoteright}-octyloxy- benzoate ((8) over bar S5 - d(4)). A global analysis of all these observables at 9 different temperatures in the nematic and smectic A phases is shown to give useful information on the core dynamics of (8) over bar S5. Inclusion of the smectic C phase in the global analysis is possible; but gives a poorer overall fitting quality factor.}, keywords = {deuteron spin relaxation, LIQUID-CRYSTAL PHASES, MOLECULAR ORDER, MOTIONS, NMR, RESONANCE, ROTATIONAL DIFFUSION, smectogen}, isbn = {1058-725X}, url = {://000082878400020}, author = {Dong, R. Y. and Bates, G. S. and Shen, X.} } @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 = {://A1995TF18600015}, author = {Chopra, N. and Chapman, R. G. and Chuang, Y. F. and Sherman, J. C. and Burnell, E. E. and Polson, J. M.} }