| 摘要 |
A material in the form of a film is described which contains, in an orientated arrangement which does not display point symmetry, compounds of formula I <IMAGE> (I) wherein X is =CH- or =N-, R1 is C12-C30-alkyl, R2 is hydrogen or C1-C30-alkyl, R3 is -NO2, -CN, -CF3, -COCF3, -SO2CH3 or -SO2CF3, R4 is hydrogen or is defined in the same way as R3, R5 is hydrogen or -NR6R7 and R6 and R7 independently of one another are hydrogen or C1-C30-alkyl, it also being possible for any of the alkyl radicals to be partially fluorinated or perfluorinated. The compounds of formula I can be arranged in Langmuir-Blodgett layer systems. Such systems can be used for example for the manufacture of opto-electronic units.
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