NMR MEASUREMENT OF RESOLVED HETERONUCLEAR DIPOLE COUPLINGS IN LIQUID-CRYSTALS AND LIPIDS

Simplified nuclear magnetic resonance (NMR) spectra of heteronuclear dipolar couplings for molecules in an anisotropic environment, such as liquid crystals and lipids, are obtained by proton-detected local-field spectroscopy. The distance-dependent dipolar interactions between spins of magnetically active nuclei can be determined directly from the spectrum because many-body effects that complicate conventional dipolar NMR spectra are avoided by selectively probing local fields produced by rare spins at the location of abundant spins. We employ the technique to resolve the carbon-proton dipolar couplings of benzene dissolved in a nematic liquid crystal and to measure phosphorus-proton couplings in lecithin in the L(alpha) phase to obtain constraints on the phosphocholine headgroup structure.


Published in:
JOURNAL OF PHYSICAL CHEMISTRY, 98, 27, 6668-6670
Year:
1994
Publisher:
AMER CHEMICAL SOC
ISSN:
0022-3654
Laboratories:




 Record created 2015-01-08, last modified 2018-03-17


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