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13C PGSE NMR Experiment with Heteronuclear Dipolar Decoupling to Measure Diffusion in Liquid Crystals and Solids

✍ Scribed by S.V Dvinskikh; R Sitnikov; I Furó

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
111 KB
Volume
142
Category
Article
ISSN
1090-7807

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✦ Synopsis

A new PGSE NMR experiment, designed to measure molecular diffusion coefficients in systems with nonvanishing static dipolar coupling, is described. The fast static dipolar dephasing of the single-quantum 13 C coherences is removed by multiple-pulse heteronuclear decoupling. The resulting slow dephasing of the 13 C coherences allows for inserting appropriate gradient pulses into the pulse sequence. The presence of the large magnetic field gradient reduces the efficiency of the decoupling sequences which is compensated for by introducing a scheme of sequential slice selection across the sample. The method is demonstrated by 19 Fdecoupled 13 C PGSE NMR experiments in a lyotropic nematic and lamellar liquid crystal.

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## Abstract It is demonstrated that in a case where neither the proton nor the natural‐abundance ^13^C‐satellite spectra of a partially oriented molecule carry enough structural information, one can determine the entire molecular geometry by the combined use of several liquid crystals as solvents.