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

Chamignon, C.; Lelli, M.; Emsley, J. W.; Luckhurst, G. R.; Zimmermann, H.

doi:10.1103/PhysRevE.108.024702

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

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Zimmermann, H.
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Chamignon, C., Lelli, M., Emsley, J. W., Luckhurst, G. R., & Zimmermann, H. (2023). Proton-decoupled deuterium NMR study of an asymmetric liquid crystal dimer having two nematic phases. Physical Review E, 108: 024702, pp. 024702-1-024702-9. doi:10.1103/PhysRevE.108.024702.

Cite as: https://hdl.handle.net/21.11116/0000-000D-B4BE-2

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 -CD2- group. The sample has two nematic liquid crystal phases: a twist-bend nematic, NTB, at the lowest temperature followed by a uniaxial nematic, NU, 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 CD2 group, hence enhancing the information content.