Abstract
A series of 1,3,4-oxadiazole derivatives, namely cholesteryl 4-(4-(5-(4-(alkoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenylethynyl)benzoate (Ch-OXD- n , n = 6, 8, 10) and methyl 4-(4-(5-(4-(alkoxy)phenyl)-1,3,4-oxadiazol-2-yl)phenylethynyl)benzoate (Me-OXD- n , n = 6, 8, 10) were synthesised and characterised by means of 1H NMR, 13C NMR, MS and HRMS. The phase behaviours of these two series of compounds have been investigated by polarising microscopic and calorimetric studies. All compounds Ch-OXD- n exhibited a cholesteric mesophase with wide mesomorphic temperature range, while the compounds Me-OXD- n displayed nematic and/or smectic A mesophases with relatively narrow temperature ranges. Both Ch-OXD- 8 and Me-OXD- 8 in chloroform individually exhibited an intense absorption band (λmax = 330 nm) and a strong blue fluorescence emission (λmax = 404 nm) with good photoluminescence quantum yields.
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