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On the structure of the Nx phase of symmetric dimers: inferences from NMR

December 19th, 2014
Anke Hoffmann,   Alexandros G. Vanakaras,   Alexandra Kohlemeir,   Georg H. Mehl and   Demetri J. Photinos
Soft Matter, 11, 850-855, 2015. DOI: 10.1039/C4SM02480J (download:
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Abstract: NMR measurements on a selectively deuterated liquid crystal dimer CB-C9-CB, exhibiting two nematic phases, show that the molecules in the lower temperature nematic phase, NX, experience a chiral environment and are ordered about a uniformly oriented director throughout the macroscopic sample. The results are contrasted with previous interpretations that suggested a twist-bend spatial variation of the director. A structural picture is proposed wherein the molecules are packed into highly correlated chiral assemblies.
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