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. 2023 Aug;108(2-1):024702.
doi: 10.1103/PhysRevE.108.024702.

Proton-decoupled deuterium NMR study of an asymmetric liquid crystal dimer having two nematic phases

C Chamignon  1 , M Lelli  2 , J W Emsley  3 , G R Luckhurst  3 , H Zimmermann  4
Affiliations

Proton-decoupled deuterium NMR study of an asymmetric liquid crystal dimer having two nematic phases

C Chamignon et al. Phys Rev E. 2023 Aug.

Abstract

Proton-decoupled deuterium NMR spectra were obtained for an asymmetric liquid crystal dimer 1-(4-cyanobiphenyl-4'-yloxy)-6-(4-cyanobiphenyl-4'-yl)hexane (CB6OCB) containing a single -CD_{2}- group. The sample has two nematic liquid crystal phases: a twist-bend nematic, N_{TB}, at the lowest temperature followed by a uniaxial nematic, N_{U}, on increasing the temperature. Proton decoupling reduces the linewidths of the peaks in the deuterium spectrum from kHz to ∼100Hz, enabling quadrupolar splittings, Δν, to be obtained with enhanced precision as well as the dipolar coupling between deuterium nuclei within the CD_{2} group, hence enhancing the information content.

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