Abstract
2H-NMR and wide-angle X-ray measurements were performed on dimer liquid crystals (LC) having an oxyethylene (OE)-type spacer such as MS-O(CH2CH2O)x-MS, MS and x respectively denoting mesogenic cores and the number of OE units. When mesogenic cores were properly chosen, these dimer compounds exhibited enantiotropic nematic LC phase over a sizably wide temperature range (∼100°C). The differential scanning calorimetry (DSC) and X-ray analyses of two crystalline samples, one prepared from a chloroform solution and the other obtained via melt crystallization, gave practically the same results. The orientational characteristics of the mesophase were studied by the 2H-NMR method, leading to a conclusion that the OE-type spacer takes spatial arrangements characteristic of the nematic phase over a wide range of temperatures.
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