We have studied the mesogenic molecule 4- n -pentyl-4‘-cyanobiphenyl (5CB) in the nematic phase by double-quantum 13 C nuclear magnetic resonance (NMR). The experiment detects selectively the very rare isotopomers containing natural pairs of 13 C spins. The 13 C− 13 C dipolar couplings were interpreted in terms of the structure and orientational order of the cyanobiphenyl fragment. Different strategies were employed to analyze the internal motion of the core moiety. This is the first investigation of molecular conformation and order which exploits magnetic 13 C− 13 C dipolar couplings in a non-labeled liquid crystal.
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Sandström et al. (1996) studied this question.
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