| abstract |
The present invention relates to compounds of the formula (I) where R 1 and R 2 independently of each other, are selected from 1H,1H—C 2 -C 10 -perfluoroalkyl and 1H,1H,2H,2H—C 3 -C 10 -perfluoroalkyl, except for the compound of formula (I), where R 1 and R 2 are both 1H,1H-perfluorobutyl, and to their use, especially as an n-type semiconductor. |