122265-84-3Relevant articles and documents
COMPOUNDS FOR USE IN LIQUID CRYSTAL DEVICES
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Page/Page column 27, (2008/06/13)
Liquid crystal compounds of Formula (I) for use in liquid crystal devices contains a dioxatetralin unit within the mesogenic liquid crystal core. The dioxatetralin unit may be located at any position within the mesogenic core of the liquid crystal compound, either at the terminus of the liquid crystal core or alternatively substantially in the middle of the liquid crystal core. The compounds of the invention exhibit fast switching and may be used in liquid crystal mixtures for particular use in imaging or display media, such as monitors or televisions.
Influence of fluoro substituents on the mesophase behaviour of banana-shaped molecules
Bedel,Rouillon,Marcerou,Laguerre,Nguyen,Achard
, p. 2214 - 2220 (2007/10/03)
Three new series of bent-shaped five-ring liquid crystals, based on the ester of isophthalic acid as the central core and azomethine linkages, are presented. They differ by the number and the position of halogeno substituents on the outer rings. This lateral substitution strongly influences the type of mesophases formed. Calculations were performed to determine the modification of the distribution of charge along the different molecules.
The synthesis and electro-optic properties of liquid crystalline 2- (2,3-difluorobiphenyl-4'-yl)-1,3-dioxanes
Dong, Chu Chuan,Styring, Peter,Goodby, John W.,Chan, Lawrence K. M.
, p. 1669 - 1677 (2007/10/03)
Fifty-six novel alkyl and/or alkoxy disubstituted 2-(2,3- difluorobiphenyl-4'-yl)-1,3-dioxanes (DFBPD) were prepared. Smectic C and nematic mesophases were exhibited by most of the alkyl-alkoxy homologues. Conversely, most of the dialkyl compounds exhibited smectic C, smectic A and nematic phases. The birefringence (Δn), dielectric anisotropy (Δε), spontaneous polarisation and response times of two ferroelectric mixtures formulated from the dioxanyl systems were determined. The birefringence results were compared with eight other groups of mixtures where the materials were based on different core systems. The overall electro-optic properties of the DFBPDs were found to be comparable to the best of the eight most commonly used materials in ferroelectric display devices.
Dioxane derivatives
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, (2008/06/13)
Dioxane derivatives for use as components in liquid crystal devices (LCDs) of general formula (A), wherein X is CH or B; R1, R2 are each A1, OA1, OCOA2, or COOA2 ; A1 is a straight or branched chain alkyl group containing from 1 to 20 carbon atoms and may be substituted with one or more F or CN. A2 is a straight or branched chain alkyl group containing from 1 to 20 carbon atoms and may be substituted with one or more F or CN and if straight may be unsubstituted. Y1, Y2, Y3 may each be (CH2)p, (CH2)p COO or OCO(CH2)p ; p is from 0 to 10, n is 0 or 1, m is 0 or 1, either or both of Z1 and Z2 are F and, when not F, are H; Y4 is a covalent bond or, when n is 0, may be (a) LCDs, containing the devices exhibit very fast switching speed, bi-stable characteristics, enhanced greyscale and storage capabilities and a wide viewing angle.
Liquid crystal compounds and compositions
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, (2008/06/13)
Liquid crystal naphtalene compounds, represented by the following formula (1) are disclosed. R-Z-A-NAP-Z?-R? (1)In the formula (1), R is an alkyl group containing 1 to 18 carbon atoms; R? is an alkyl group containing 1 to 21 carbon atoms; NAP represents 2,6-naphthylene group; A, Z and Z? are as follows: 1) A is Pyr> and (a) Z is - or and Z? is O, or (b) Z is - and Z? is COO; 2) if A is Pym>, (a) Z is - and Z? is O, or (b) Z is O and Z? is -, O or ; 3) A is FPhF and (a) Z is - or O and Z? is -, O or COO, (b) Z is OCO and Z? is - or O, or (c) Z is and Z? is O; 4) A is PhF and (a) Z is - or and Z? is O, (b) Z is O and Z? is -, or (c) Z is - and Z? is COO; 5) A is FPh and (a) Z is O and Z? is-, (b) Z is -, O, or OCO and Z? is O, or (c) Z is O and Z? is COO; 6) A is Pyr and Z is -, O or and Z? is O; or 7) A is Ph and one of Z and Z? is - and the other is O; As a component of liquid crystal compositions showing chiral smectic C phase, these compounds can provide liquid crystal compositions of improved orientation and free from zigzag deffects, and liquid crystal display elements of high contrast ratio.
67. Ferroelectric Liquid Crystals. Laterally Substituted Phenyl Benzoates Incorporating a trans-1,4-Disubstituted Cyclohexane Ring.
Kelly, Stephen M.
, p. 594 - 607 (2007/10/02)
About 65 diverse phenyl benzoates incorporating a trans-1,4-disubstituted cyclohexane ring and at least one lateral substituent have been synthesised.The dependence of the liquid-crystal transition temperatures of these materials on various lateral substituents (F, Cl, CN, and Br) in different positions of the esters has been investigated systematically.The influence of up to four F-atoms in various positions of a standard ester has been thoroughly studied and the optimum combination for a broad smectic C mesomorphic range established.In consequence, three homologous series incorporating the 4-alkoxy-2,3-difluorobenzoic-acid moiety were prepared.An additional C=C bond was introduced into the alkyl chain attached to the cyclohexane ring of some of these esters and the resulting modifications of the transition temperatures determined.Three ester series incorporating a lateral substituent and the optically active (+)-(S)-(1-methylphenyl)oxy substituent have also been synthesised, and similar effects have been observed.These materials can be used as important components of commercial chiral smectic C mixtures for electro-optic display device applications.
