@article {342,
	title = {Inclusion complexes oriented in thermotropic liquid-crystalline solvents studied with carbon-13 NMR},
	journal = {Journal of Physical Chemistry B},
	volume = {107},
	year = {2003},
	note = {J Phys Chem B743MATimes Cited:11Cited References Count:19},
	month = {Nov 20},
	pages = {12558-12561},
	abstract = {<p>The inclusion complex of cryptophane-A and chloroform dissolved in two nonchiral liquid-crystalline environments was investigated via C-13 NMR. Stable solutions of oriented complexes were prepared using aromatic (ZLI 1132) and aliphatic (ZLI 1695) thermotropic nematic liquid crystals as solvents; ordering of the complexes was manifested by the H-1-C-13 dipolar splitting of the C-13 resonance of labeled chloroform. In both solutions, the dipolar splitting for the bound ligands was substantially larger than that obtained for the free ligands, indicating a significant increase in ligand ordering upon complexation despite the absence of direct contact with the oriented solvent molecules. A similar enhancement in ordering was observed for complexed ligands compared to that for free ligands in both liquid-crystalline solvents. Also, the application of heteronuclear decoupling to the ZLI 1695 solution resulted in a reduced line width for the bound C-13 chloroform resonance, suggesting that a significant component of the observed line broadening may originate from intermolecular couplings between host and guest molecules. These results demonstrate the potential for using restored dipolar couplings to investigate structural and dynamical aspects of inclusion complexes in solution.</p>
},
	keywords = {xe-129},
	isbn = {1520-6106},
	doi = {Doi 10.1021/Jp030431e},
	url = {<Go to ISI>://WOS:000186574500003},
	author = {Marjanska, M. and Goodson, B. M. and Castiglione, F. and Pines, A.}
}
@article {393,
	title = {Effects of diffusion on magnetic resonance imaging of laser-polarized xenon gas},
	journal = {Journal of Chemical Physics},
	volume = {108},
	year = {1998},
	note = {J Chem PhysZh114Times Cited:30Cited References Count:24},
	month = {Apr 15},
	pages = {6233-6239},
	abstract = {<p>Molecular diffusion during the application of magnetic field gradients can distort magnetic resonance images. A systematic characterization of these distortions in one dimension was performed using highly spin-polarized xenon gas. By varying the strength of the applied gradient and the geometric dimension of the sample, the evolution of these image distortions between the regimes of strong and weak diffusion was observed. These results are compared with numerical simulations. By directly measuring the displacement distribution of the polarized xenon atoms, it is shown that in the weak-diffusion regime the image distortions originate from the restricted diffusive motion near the sample boundaries, in agreement with previous theoretical work. Additionally, it is shown that the effects of diffusion can be utilized to enhance the contrast between the boundaries and bulk in the images of polarized gas samples, and thus may be exploited as a means of boundary detection in such systems. (C) 1998 American Institute of Physics. [S0021-9606(98)02915-8].</p>
},
	keywords = {xe-129},
	isbn = {0021-9606},
	doi = {Doi 10.1063/1.476030},
	url = {<Go to ISI>://WOS:000073073700018},
	author = {Song, Y. Q. and Goodson, B. M. and Sheridan, B. and de Swiet, T. M. and Pines, A.}
}
