93144-80-0Relevant academic research and scientific papers
Dicationic imidazolium-based ionic liquids and ionic liquid crystals with variously positioned fluoro substituents
Li, Xiaoju,Bruce, Duncan W.,Shreeve, Jean'Ne M.
experimental part, p. 8232 - 8238 (2010/06/16)
A series of new dicationic imidazolium-based organic salts bearing fluoro substituents on the bent-core unit and/or linker benzene-ring positions has been synthesized and characterized. The properties of these salts, including transition and decomposition temperatures, and density were determined, indicating that their performance is strongly dependent on the positions of the fluoro substituents, the number of carbon atoms in the alkyl group, and the anion present. Examination by polarized optical microscopy showed that the four salts (compounds 4c, 7a, 7b and 8b, where the alkyl group was C 12H25-) were mesomorphic and these data were supported by DSC measurements.
Synthesis and mesomorphic properties of some fluorinated benzoate liquid crystals
Yang, Yong Gang,Chen,Tang,Wen
, p. 1 - 15 (2007/10/03)
Three series of [4-(4′-n-alkyloxyphenyl)acetylenyl]-2,6- difluorophenyl fluorinated benezoates and one series of fluorinated benzoates with 2,3,5,6-tetrafluorophenylene group and semi-perfluorocarbon chain have been synthesized. Their phase transition temperatures have been measured by texture observation in a polarizing microscope and confirmed by DSC. For the series without fluorocarbon chains, increasing the quantity of fluorosubstituents on the terminal phenyl groups decreased nematic stability (TN-I), but the breadth of the SmA phase range was increased. Lateral fluorosubstitution in the central group lowered the nematic stability (TN-I) and decreased the breadth of the SmA phase range. The series with semiperfluorocarbon chains were more likely to form SmA phases than the series with hydrogencarbon chains, and with the increasing of fluorosubstituents quantity on the terminal phenyl groups nematic and SmA stability (TN-I and TsmA-N) were both decreased.
Synthesis and mesomorphic properties of some fluoro-substituted benzoates
Yang,Tang,Gong,Wen
, p. 153 - 165 (2007/10/03)
Several series of fluoro-substituted benzoate liquid crystals have been synthesized. The results showed that the SmA phase is enhanced with the increasing of the degree of fluoro-substitution on the para- and meta-position of the terminal phenyl groups. And the molecules which have same molecular structural formula show nearly the same melting points. It is also discussed about the effect of the ester bond's direction on the mesomorphic properties.
Optically active compounds
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, (2008/06/13)
Optically active compounds having the following formulae (1), (2) or (3) STR1 wherein R and R' are C1-20 alkyl groups; X and Y1 are --, O, S, or divalent groups such as COO, OOC and OCOO; m is 0 or 1; n is 0 to 5; A2 is a cyclic group, such as p,p'-biphenylene, 2,6-naphthylene, 2,5-pyrimidinylene-1,4-phenylene, A1 -Y2 -pyridylene or A4 -Y2 -A5 ; Y2 is CH2 CH2 or C C; A3 is 2,6-naphthylene, A1 -Y2 -pyridylene or A6 -CH2 CH2 -A7 ; and A1, A4, A5, A6 and A7 are cyclic groups, such as 1,4-phenylene and/or 4,4'-biphenylene.
Liquid crystal compounds and optically active compounds
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, (2008/06/13)
A compound usefull for liquid crystal component which is represented by the following formulas (1), (2), (3), or (4) ;, R1 -X1 -A1 -( A2 )n-Y1 -A3 -X2 -R2 (1), R1 -X1 -( A3 -Y1 )N-A1 -A2 -X2 -R2 (2), R3 -X1 -A4 -Y1 -A3 -X2 -R4 (3), R3 -X1 -A5 -Y1 -A1 -A2 -X2 -R4 (4), wherein R1 ,R2 ,R3 and R4 are C1 18 alkyl groups; X1 and X2 is -, O, S, -C≡C- or divarent groups such as COO, OCO, CH2 O or OCH2
