| 摘要 |
The invention relates to liquid crystalline compounds of formula (I), wherein R<1> and R<2> are each independently a normal or branched alkyl residue with up to 16 C atoms or a normal or branched alkenyl residue with 3 to 16 C atoms wherein one or two non-adjacent CH2 groups of these residues may be replaced by -O-, -CO-, -O-CO- or -CO-O-, X<1> and X<2> are each independently a methyl group or a halogen atom, n and m are each independently 0, 1, 2, 3 or 4, preferably to liquid crystalline compounds of formula (I), wherein R<2> is a chiral residue of formula (II), wherein Q denotes an alkylene residue with up to 7 C atoms wherein one CH2 group may be replaced by -O-, -CO-O- or -O-CO- or a single bond, Y denotes an alkyl residue with 2 to 7 C atoms wherein one CH2 group may be replaced by -O-, -CO-O- or -O-CO-, furthermore to liquid crystal phases containing compounds of formula (I), to electrooptic and thermographic devices and to a method of surface thermography. |
