X-ray diffraction analysis reveals distinct molecular ordering and phase transitions in liquid crystals, indicating structural differences between nematic and smectic states.
X-ray studies of two liquid crystalline compounds, viz., p-ethoxybenzylidene p-heptylaniline (2O.7) and p-butoxybenzylidene p-heptylaniline (4O.7) are reported in this paper. The compound 2O.7 shows only a nematic phase while 4O.7 exhibits SmB, SmC, SmA, and nematic phases. Using powder X-ray diffraction patterns recorded at different temperatures, the microstructural parameters, and pair correlation function of these compounds have been estimated. The results obtained are inferred in terms of molecular ordering present in their nematic and smectic phases.
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Usha et al. (2015) studied this question.
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