申请人:The Secretary of State for Defence in Her Britannic Majesty's Government
公开号:US05496500A1
公开(公告)日:1996-03-05
Liquid crystal compounds of formula (I) are described, where formula (I) is given as R.sub.1 --A--(X.sub.m --(B).sub.n --R.sub.2 where A is selected from nathyl, flourinated naphthyl, brominated naphthyl, B is selected from phenyl, methylated phenyl, brominated phenyl, fluorinated phenyl, thiophene, pyrimidine and pyridine, R.sub.1 and R.sub.2 are independently selected from alkyl, alkoxy, alkynyl, thioalkyl, Br, CN, SCN, NCS, perfluoroalkyl, perfluoroalkoxy and hydrogen, X is selected from C.tbd.C, COO and C.tbd.C, m is 0 or 1, n is 0 or 1 where m is 1 and n is 0 where m is 0; provided that where A is naphthyl, n is 1 and m is 0 then B is selected from methylated phenyl, brominated phenyl, thiophene, pyrimidine and pyridine; and further provided that where A is naphthyl, X is C.tbd.C, m is 1 and n is 1, then B is selected from thiophene, pyrimidine and pyridine. Also described are liquid crystal compounds suitable for inclusion in devices utilizing pretransitional characteristics of liquid crystalline materials in the isotropic phase and described by formula (II): R.sub.3 --J--(Y).sub.p --(Z).sub.q --R.sub. 4, where J is selected from nathyl, fluorinated naphthyl, brominated naphthyl, Z is selected from phenyl, methylated phenyl, brominated phenyl, fluorinated phenyl, thiophene, pyrimidine and pyridine, R.sub.1 and R.sub.2 are independently selected from alkyl, alkoxy, alkynyl, thioalkyl, Br, CN, SCN, NCS, perfluoroalkyl, perfluoroalkoxy and hydrogen, Y is selected from C.dbd.C, COO and C.dbd.C, p is 0 or 1, q is 0 or 1 where p is 1 and q is 0 where p is 0.
描述了化学式(I)的液晶化合物,其中化学式(I)给出为R.sub.1 --A--(X.sub.m --(B).sub.n --R.sub.2,其中A选自nathyl,氟化naphthyl,溴化naphthyl,B选自苯基,甲基化苯基,溴化苯基,氟化苯基,噻吩,嘧啶和吡啶,R.sub.1和R.sub.2分别选自烷基,烷氧基,烷炔基,硫烷基,Br,CN,SCN,NCS,全氟烷基,全氟烷氧基和氢,X选自C.tbd.C,COO和C.tbd.C,m为0或1,n为0或1,其中m为1且n为0时,m为0时n为0;但要求当A为naphthyl时,n为1且m为0时,B选自甲基化苯基,溴化苯基,噻吩,嘧啶和吡啶;进一步要求当A为naphthyl,X为C.tbd.C,m为1且n为1时,B选自噻吩,嘧啶和吡啶。还描述了适用于包含在利用液晶材料各向同性相的前过渡特性的器件中的液晶化合物,其化学式为(II):R.sub.3 --J--(Y).sub.p --(Z).sub.q --R.sub.4,其中J选自nathyl,氟化naphthyl,溴化naphthyl,Z选自苯基,甲基化苯基,溴化苯基,氟化苯基,噻吩,嘧啶和吡啶,R.sub.1和R.sub.2分别选自烷基,烷氧基,烷炔基,硫烷基,Br,CN,SCN,NCS,全氟烷基,全氟烷氧基和氢,Y选自C.dbd.C,COO和C.dbd.C,p为0或1,q为0或1,其中p为1且q为0时,p为0时q为0。