Abstract
NMR experiments in ordered fluids can provide values of time averages of nuclear spin interactions such as dipole-dipole, electric quadrupole and chemical shift. From these one can evaluate second rank orientational order parameters pertaining to the various nuclear sites (chemical shifts) or pairs of sites (dipolar couplings) or mole cular segments (quadrupolar splittings) [1], Such order parameters are useful mainly because:
-
(i)
they provide quantitative measures of molecular orientational ordering from which information on the symmetry and structure of the ordered fluid as well as on certain physicochemical processes taking place therein, can be obtained;
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(ii)
they can be used for molecular structure determination, either of the molecules forming the ordered fluid phase itself or of molecules dissolved therein;
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(iii)
they can provide information on the underlying molecular interactions from which insights can be gained on molecular structure - macroscopic property relations in ordered fluids.
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Photinos, D.J. (2003). Molecular Theory of Orientational Order. In: Burnell, E.E., de Lange, C.A. (eds) NMR of Ordered Liquids. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0221-8_12
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DOI: https://doi.org/10.1007/978-94-017-0221-8_12
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