申请人:The Secretary of State for Defence in her Britannic Majesty's Government
公开号:US05888421A1
公开(公告)日:1999-03-30
##STR1## The invention describes liquid crystalline compounds or formula (I), where A, D and G are independently selected from phenyl, thiophene, hydrogenated phenyl, chlorinated phenyl and fluorinated phenyl, B and E are independently selected from a single bond C.dbd..notident.C. C.tbd.C.C00, azoxy and diazo, k and m are independently selected from 1 and 0, such that m+n is 1 or 2, and R.sub.1 and R.sub.2 are independently selected from R, R0, alkynyl, thioalkyl, hydrogen, CN, NCS and SCN; provided that at least one of R.sub.1 and R.sub.2 is selected from CN, NCS and SCN and that at least one of A, D and G is phenyl; and excluding where at least one of R.sub.1 and R.sub.2 is independently selected as CN and one of A, D or G is not thiophene, and where m is 0, A, and D are phenyl, B is a single bond and only one of R.sub.1 or R.sub.2 is NCS. Also described are compounds suitable for inclusion in a device utilizing pretransitional characteristics of liquid crystalline materials in the isotropic phase, of general formula (II) where J and Y are independently selected from phenyl, thiophene, hydrogenated phenyl, chlorinated phenyl and fluorinated phenyl, X is selected from C.dbd..notident.C. C.tbd.C.COO azoxy and diazo, k is 1 or 0 and R.sub.3 and R.sub.4 are independently selected from R, RO, alkynyl, thioalkyl, hydrogen, CN, NCS and SCN; provided that at least one of R.sub.3 and R.sub.4 is selected from CN, NCS and SCN and that at least one of J and Y is phenyl.
该发明描述了液晶化合物或式(I),其中A、D和G分别选自苯基、噻吩、氢化苯基、氯化苯基和氟化苯基,B和E分别选自单键C.dbd..notident.C、C.tbd.C.COO、偶氮基和重氮基,k和m分别选自1和0,使得m+n为1或2,R.sub.1和R.sub.2分别选自R、R0、炔基、硫代烷基、氢、CN、NCS和SCN;条件是R.sub.1和R.sub.2中至少有一个选自CN、NCS和SCN,且A、D和G中至少有一个为苯基;并且排除当R.sub.1和R.sub.2中至少有一个独立选择为CN,且A、D或G中至少有一个不是噻吩时,以及当m为0时,A和D为苯基,B为单键,且R.sub.1或R.sub.2仅有一个为NCS。还描述了适合用于利用液晶材料在各向同性相中的前转变特性的装置中的化合物,其通式为(II),其中J和Y分别选自苯基、噻吩、氢化苯基、氯化苯基和氟化苯基,X选自C.dbd..notident.C、C.tbd.C.COO、偶氮基和重氮基,k为1或0,R.sub.3和R.sub.4分别选自R、RO、炔基、硫代烷基、氢、CN、NCS和SCN;条件是R.sub.3和R.sub.4中至少有一个选自CN、NCS和SCN,且J和Y中至少有一个为苯基。