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Two-Dimensional NMR Correlations of Liquid Crystals Using Switched Angle Spinning

✍ Scribed by R.H Havlin; G.H.J Park; A Pines

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
159 KB
Volume
157
Category
Article
ISSN
1090-7807

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✦ Synopsis

We present the first application of switched angle spinning (SAS) to correlate the first-order dipolar spectrum of a liquid crystalline sample with the isotropic magic angle spinning (MAS) spectrum in a two-dimensional experiment. In this experiment we are able to select the degree of dipolar couplings introduced via mechanical manipulations of the liquid crystal director in a single oriented sample. The (19)F SAS-COSY correlation of iodotrifluoroethylene, an AMX spin system, dissolved in the nematic liquid crystal 4-octylphenyl-2-chloro-4-(4-heptylbenzoyloxy)-benzoate provides assignment of both the J and dipolar couplings in a single experiment. This work demonstrates the use of oriented samples and sample spinning to resolve homonuclear dipolar couplings using isotropic chemical shifts.

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