| abstract |
Trifluortoluol derivates having formula (I), in which R1 means alkyl with 1 to 12 C atoms, in which one or several non-adjacent CH2 groups may be substituted by -O-, -CO-, -O-CO-, -CO-O-, -O-CO-O-, -CH halogen, -CH-CN- and/or -CH=CH-; A1 and A2 means independently from each other 1,4 phenylene, unsubstituted or substituted one or several times with halogen, nitrile and/or CH3, in which one or two non-adjacent CH2 groups may be substituted with -O- and/or -S-, or 1,4-bicyclo(2,2,2)octylen, Z1 and Z2 mean independently from each other -CO-O-, -O-CO-, -CH2O-, -OCH2-, -CH2CH2- or a simple bond and n means 0 or 1. These derivates are used as components of chirally oriented smectic phases. |