Abstract
ABSTRACTIn order to investigate the influence of the central linking group and the effect of flexibility on mesomorphism, we have synthesised a newly homologous series 3-(3-butoxyphenyl)-1-(4-n-alkoxy phenyl) prop-2-en-1-one (series-l) consisting of 13 homologues C1–C8, C10, C12, C14, C16 and C18. In the present series, mesophase commences from the C6 homologue. C1–C5 homologues did not exhibit liquid crystalline (LC) property, while C6–C12 homologues exhibited an enantiotropic nematic phase and the rest of the homologues C14–C18 displayed monotropic SmC and nematic mesophase. The transition temperatures of the synthesised compounds were determined by an optical polarising microscopy equipped with a heating stage. All newly synthesised compounds were confirmed by 1H-NMR, 13C-NMR, IR and elemental analysis.
Highlights
Liquid crystalline (LC) [1] property of a substance is a unique property, which flows on the surface like a liquid and possesses optical properties like crystals
polarising microscope (POM) investigation The target chalconyl base compounds and their intermediates were synthesised as outlined in Scheme 1. 4n-alkoxy benzaldehydes condensation with 3-butoxy acetophenone yielded 13 chalconyl derivatives
The transition temperatures (Table 2) of the present newly homologous series-1 are determined by POM, and the phase diagram is plotted against the transition temperature versus the number of carbon atoms present in the n-alkyl chain ‘R’ of the-OR terminal group and subsequently on linking like or related points, the transition curves Cr–I/N, I–N or N–I, N–Sm are obtained
Summary
Liquid crystalline (LC) [1] property of a substance is a unique property, which flows on the surface like a liquid and possesses optical properties like crystals. Such substances of thermotropic or lyotropic varieties are neither fully crystalline nor fully liquid. Thermometric data will be derived using an optical polarising microscope (POM) equipped with a heating stage and this will be discussed and interpreted in terms of molecular rigidity and flexibility in relation [8,13,14,15] to molecular structure geometry, size, polarity, polarisability, etc. The LC properties of the present novel series will be compared with the structurally similar analogous series
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