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DISTINCT NMR for Sign Determination of C–H Dipolar Couplings in Liquid-Crystalline Lipids

✍ Scribed by M. Hong; K. Schmidt-Rohr

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
205 KB
Volume
109
Category
Article
ISSN
1064-1866

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✦ Synopsis

A recently introduced DISTINCT technique for the determinator and the B 0 field. Comparison of the two equations shows tion of the signs of C-H dipolar couplings is described in detail. that the coupling constant of the averaged dipolar interaction, It is a switching-angle spinning experiment that employs scalar d V d , is the product of the rigid-limit coupling constant d d and couplings to make sign-dependent heteronuclear coherence obthe C-H bond order parameter, which is the averaged term servable. The pulse sequence and the time evolution of the density in Eq. [2],

operator are described, both for proton-detected local field evolution and the carbon-detected separated local field evolution. The

original 1D DISTINCT experiment has also been developed into a 2D technique to allow the direct observation of antiphase dipolar powder spectra, characteristic of the signs of the dipolar couplings.

In a dipolar Pake spectrum observed for isotropically ori-These techniques are demonstrated on a liquid-crystalline lipid, ented domains, this averaged coupling constant corresponds lecithin.

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