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- W900636942 abstract "A series of , were synthesized, and their thermal and liquid crystalline properties were studied. The chain length of the central polymethylene spacers, x, of the chiral twin compounds was varied from 3 to 12. These compounds were characterized by elemental analysis, IR and NMR spectroscopy, differential thermal analysis (DSC), and crosspolarized microscopy. All compounds were found to be enantiotropic liquid crystalline, and the values of melting and isotropization temperature as well as and decreased in a zig-zag fashion, revealing the so called odd-even effect as x increased. Their mesomorphic properties fell into four categories depending upon x; (a) compounds with x=3, 4 and 5 formed only a cholesteric phase on heating, while on cooling they went through two transitions of isotropic (I)-to-cholesteric (Ch) and Ch-to-smectic phases before crystallization. (b) compounds with x=6, 8 and 10 exhibited only a cholesteric phase both on heating and on cooling. (c) compounds with x=7 and 9 went through three transitions of crystal and Ch-to-I phases on heating while on cooling they went through four transitions of I-to-Ch, phases in that order, and (d) compounds with x=11 and 12 went reversibly through four transitions of and Ch-to-I phases." @default.
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- W900636942 date "1998-01-01" @default.
- W900636942 modified "2023-09-23" @default.
- W900636942 title "${alpha},{omega}$-Bis[4-(4'(S)-(+)-2-methylbutylbiphenyl-4-carboxy)phenoxy]alkanes-Synthesis and Liquid Crystalline Properties of New Dimesogenic Compounds" @default.
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