摘要:
A novel liquid crystal compound, a nematic liquid crystal composition, and a liquid crystal display system using the composition are disclosed herein. The liquid crystal compound is represented by the general formula (I): wherein R represents a hydrogen atom or a straight chain alkyl group having 1 to 7 carbon atoms and each of X, Y and Z independently represents hydrogen atom or fluorine atom. The nematic liquid crystal composition of the present invention can provide liquid crystal materials in response to desired purposes even by its addition in a small amount without spoiling other characteristics.
摘要:
A novel compound represented by general formula (I) and a nematic liquid crystal composition containing the same. A compound represented by general formula (I) can be produced with great ease as is shown in an example and has excellent compatibility with a mother liquid crystal of general use being currently used as a nematic liquid crystal, and further shows reduced precipitation at a low temperature. Moreover, the addition of only a small amount of the above compound to the mother liquid crystal results in expanding effectively the temperature range for liquid crystallinity, without detriment to various properties as a liquid crystal material. Accordingly, the above compound is suitable for use in various liquid crystal display elements which are required to have a wide range of working temperature and is greatly useful as a liquid crystal material.
摘要:
A novel cyclic hydrocarbon derivative is disclosed, which is represented by formula (I):
wherein Y¹ and Y² each independently represent a fluorine atom, a chlorine atom, a cyano group, a cyanato group (OCN), a thiocyanato group (SCN), a trifluoromethoxy group (OCF₃), a difluoromethoxy group (OCF₂H), a 2,2,2-trifluoroethoxy group (OCH₂CF₃), a trifluoromethyl group (CF₃), R, -OR, -COOR or -OCOR, wherein R represents an alkyl group having from 1 to 20 carbon atoms, an alkenyl group having from 2 to 20 carbon atoms or an alkoxylalkyl group having from 2 to 20 carbon atoms, provided that at least one of Y¹ and Y² represents R, -OR, -COOR or -OCOR; Z, Z¹, Z², Z³, and Z⁴ each independently represent a single bond, -CH₂CH₂-, -CH=CH-, -C≡C-, -COO-, -OCO-, -CH₂O-, -OCH₂-, -(CH₂)₄-, -(CH₂)₃-O- or -O-(CH₂)₃-; ring A represents a group of formula (II):
wherein X¹, X², X³, X⁴, X⁵, X⁶, X⁷, X⁸, X⁹, and X¹⁰ each independently represent a hydrogen atom (H) or a deuterium atom (D), provided that at least one of them represents a deuterium atom (D); rings K, L, J, M and N each independently represent a trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group, a trans-1,4-cyclohexylene group substituted with 1 to 4 substituents selected from a fluorine atom and a cyano group, a 1,4-phenylene group, a 1,4-phenylene group substituted with 1 to 4 substituents selected from a fluorine atom, a chlorine atom, a cyano group and a methyl group, a 1,3-dioxane-2,6-diyl group, a pyrimidine-2,5-diyl group, a pyridine-2,5-diyl group, a pyrazine-2,5-diyl group or a group of formula (III):
wherein X¹¹, X¹², X¹³, X¹⁴, X¹⁵, X¹⁶, X¹⁷, X¹⁸, X¹⁹, and X²⁰ each independently represent a hydrogen atom (H) or a deuterium atom (D), provided that at least one of them represents a deuterium atom (D); in which the ring of formula (III) may be the same or different with ring A; and k, l, m, and n each independently represent 0 or 1, provided that the sum of k, l, m, and n is 0, 1 or 2. The compound of the present invention is useful as an electro-optic liquid crystal display material.
摘要:
compound represented by formula (I): wherein R 1 represents an alkyl group having from 1 to 18 carbon atoms; R 2 represents an alkyl group having from 2 to 16 carbon atoms; rings A, B, C, and D each represents a 1,4-phenylene group or a 1,4-phenylene group having one or two halogen atoms; Y represents a single bond, m and n each represents 0 or 1; p represents 0, 1, or 2; q represents 0 or an integer of from 1 to 6; and C * and C" each represents an asymmetric carbon atom in an (S)- or (R)-configuration, and a liquid crystal composition containing the compound of formula (I). The compound of formula (I) is a chiral liquid crystal compound exhibiting large spontaneous polarization, a long helical pitch, an SC * phase in a broad temperature range including room temperature, satisfactory orientation, and a high rate of response.
摘要:
A liquid crystalline compound represented by formula wherein
R denotes an alkyl or alkoxy group having 1 to 20 carbon atoms, m and n are each 0 or 1, provided m and n are not 1 at the same time.
X and Y each denote a hydrogen atom, a halogen atom or a nitro group, provided X and Y are not hydrogen atoms at the same time, and Q * denotes an optically active group having an asymmetric carbon atom and a linear or cyclic alkyl or alkenyl group which may be substituted by a halogen atom, or the like.