NMR measurement of resolved heteronuclear dipole couplings in liquid crystals and lipids

Journal Article · Thu Jul 07 04:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100078a002· OSTI ID:7102057

Schmidt-Rohr, K; Nanz, D; Emsley, L; Pines, A ^[1]

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1. Lawrence Berkeley Lab., CA (United States) Univ. of California, Berkeley, CA (United States)

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 phosporus-proton couplings in lecithin in the L[sub [alpha]] phase to obtain constraints on the phosphocholine headgroup structure. 25 refs., 4 figs.

• OSTI ID: 7102057
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:27; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
AROMATICS
BENZENE
COUPLING
CRYSTALS
ESTERS
FLUIDS
HYDROCARBONS
LECITHINS
LIPIDS
LIQUID CRYSTALS
LIQUIDS
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHOLIPIDS
RESONANCE