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NMR Studies of Molecules Oriented in the Nematic Phase of Liquid Crystals

Conference paper
Part of the NMR Basic Principles and Progress / Grundlagen und Fortschritte book series (NMR, volume 1)

Abstract

In nuclear magnetic resonance (NMR) experiments with liquids and gases, the local magnetic fields at the sites of the nuclei, responsible for the various transition frequencies, change with the orientation of the molecules relative to the applied external magnetic field. As a consequence of rapid molecular motion only the average values of the shift and coupling parameters can be observed. For nuclei with spin 1/2, each of the chemical shifts and the indirect spin-spin coupling constants, which are actually second rank tensors with as many as nine independent components, affect the normal high resolution NMR spectra (in isotropic media) as single parameters proportional to the trace of the tensors. This simplifies the normal NMR spectra but at the same time imposes a considerable loss of information. Furthermore, in isotropic media, the direct magnetic dipole-dipole interaction transmitted through space becomes zero when averaged. This interaction, proportional to the inverse cube of the inter-nuclear distance, is a symmetric and traceless tensor having a maximum of five independent components. The geometrical information which it carries is also lost as a consequence of the averaging process.

Keywords

Nuclear Magnetic Resonance Liquid Crystal Nuclear Magnetic Resonance Spectrum Direct Coupling Orientation Parameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag Berlin Heidelberg 1969

Authors and Affiliations

  1. 1.Department of PhysicsUniversity of BaselSwitzerland

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