Issue 14, 1975

Structure and conformation of 4,4′-bipyridyl by nuclear magnetic resonance spectroscopy of a nematic solution

Abstract

The 200 MHz1H n.m.r. spectrum of 4,4′-bipyridyl dissolved in the nematic liquid crystal, Phase V, has been obtained and analysed. The dipolar couplings are shown to be consistent with rapid rotation about the inter-ring C–C bond, such that only four positions are appreciably populated, each having an inter-ring angle of 29.6 ± 0.01°. This implies that the barrier to rotation V(θ) of the molecule dissolved in the liquid crystal has maxima at 0 (planar) and 90° which are both relatively high, and that V(90°) is greater than V(0°). These conclusions are obtained only if vibrational averaging of the dipolar couplings is carried out.

Article information

Article type
Paper

J. Chem. Soc., Perkin Trans. 2, 1975, 1541-1544

Structure and conformation of 4,4′-bipyridyl by nuclear magnetic resonance spectroscopy of a nematic solution

J. W. Emsley, D. S. Stephenson, J. C. Lindon, L. Lunazzi and S. Pulga, J. Chem. Soc., Perkin Trans. 2, 1975, 1541 DOI: 10.1039/P29750001541

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