| 摘要 |
<p>The invention provides compounds of formula (I), wherein A1 to A4 are independently selected from the group consisting hydrogen, a methyl group and a hydrocarbon group containing from 2 to 80 carbon atoms in which one or more carbon atoms are optionally replaced by a heteroatom selected from the group consisting -O-, -S- and -N- with the proviso that firstly no two heteroatoms are joined together and secondly that at least one of A1 to A4 includes a polymerisable group; B1 represents a hydrocarbon group containing from 4 to 80 carbon atoms, in which one or more carbon atoms are optionally replaced by a heteroatom selected from the group consisting -O-, -S- and -N- with the proviso that no two heteroatoms are joined together; MG?1 and MG2¿ are the same or different and each independently represents an aromatic or non-aromatic carbocyclic or heterocyclic ring system containing from 1 to 80 carbon atoms, with the proviso that firstly at least one of MG?1 and MG2¿ comprises at least two ring systems and secondly, when MG?1 and MG2¿ are identical each of A?1 and A2 or A3 and A4¿ are different. The invention also provides liquid crystalline mixtures and optical or electro-optical devices including compounds of formula (I).</p> |
