期刊
CRYSTALS
卷 10, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/cryst10040284
关键词
bent-core liquid crystal; nematic phase; cybotaxis; H-2 NMR; X-ray diffraction
资金
- EPSRC [EP/S020845/1, EP/S020802/1] Funding Source: UKRI
Bent-core liquid crystals showing a nematic phase stable at low temperatures are very attractive for applicative purposes in view of the inherent biaxial nature of the nematic phase. In this work, a typical five-ring bent-core mesogen was investigated by means of H-2 NMR spectroscopy and X-ray diffraction (XRD) methods. These techniques provide complementary information on the structural properties of the nematic phase and the average mesogen conformation: small-angle XRD reveals the presence of short-range positional order in the form of skewed cybotaxis, while a comparison of the orientational order parameters measured by wide-angle XRD and NMR provides an estimate of the molecule bend angle. In addition, H-2 NMR puts in evidence the occurrence of an unexpected transition to a low-temperature tilted phase, having a crystalline or smectic-like character. The results were compared with those of previous C-13 NMR investigations.
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