Deuterium quadrupole splitting

To study the N-1 phase transition, it is necessary to find some physical property proportional to 5(7) that can be measured accurately as a function of temperature. There are many possibilities, which include depolarization of Raman spectra, diamagnetic susceptibility anisotropy, NMR deuterium quadrupole splitting, dielectric constant... 

The NMR method, especially the deuterium quadrupole splitting can distinguish lyotropic phases, reveal heterophasic regions, determine the order profiles of the alkyl chains in micelles, and measure the orientational order of molecular moieties in anisotropic surroundings [17], [18], [19]. 

Phosphorous nuclear magnetic resonance ( P-NMR) No isotope labeling is required for P-NMR spectroscopy. The chemical shielding anisotropy, Aa, in P-NMR is comparable to the deuterium quadrupole splitting in H-NMR and can be determined from the edges of the spectrum. 

The hydrocarbon chains of the lipid bilayer are in a liquid-like state as evidenced by X-ray diffraction, electron spin resonance spectroscopy, and differential scanning calorimetry studies. A quantitative characterization of the hydrocarbon chain order in lipid bilayers by means of H-NMR became possible by selectively deuterating both fatty acyl chains in a lipid molecule. Measurement of the deuterium quadrupole splittings, Avq, allowed calculation of the order parameter of the C—D bond vector at each labeled carbon atom. The variation of the order parameter ScdI with the position of the labeled carbon atom in the membrane is the so-called order profile. An... 

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