Substituted poly(arylenevinylenes), process for their preparation, and their use in electroluminescent elements

A polymerizable biaryl derivative of the formula (II)

• in which Hal and Hal′ are identical or different and are Cl, Br or I, and the other symbols and indices have the following meanings:
• Aryl:
• is an aryl group having 4 to 14 carbon atoms;
• R′:
• is a substituent which is either in the labeled phenylene position 5 or 6 and is CN, F, Cl, N(R1R2) or a straight chain, branched or cyclic alkyl, alkoxy or thioalkoxy group having 1 to 20 carbon atoms, in which, in addition, one or more H atoms may be replaced by F;
• R″:
• are identical or different and are CN, F, Cl or a straight-chain, branched or cyclic alkyl or alkoxy group having 1 to 20 carbon atoms, where one or more non-adjacent CH2 groups may be replaced by —O—, —S—, —CO—, —COO—, —O—CO—, —NR1—, —(NR2R3)+—A− or —CONR4—, and where one or more H atoms may be replaced by F, or an aryl group having 4 to 14 carbon atoms, which may be substituted by one or more non-aromatic radicals R′;
• R1, R2, R3, R4 are identical or different and are H or an aliphatic or aromatic hydrocarbon radical having 1 to 20 carbon atoms;
• A−:
• is a singly charged anion or an equivalent thereof;
• and n:
• is 0, 1, 2, 3, 4 or 5;
• with the exception of 2,5-bis(chloromethyl-4-methoxy-4′-(3,7-dimethyloctyloxy)-biphenyl and 2,5-bis(chloromethyl-4-methoxy-3′(3,7-dimethyloctyloxy)-biphenyl.