| abstract |
Compounds of the formula D-S 1 -A-S 2 —B 1 wherein A comprises a 2,7-disubstituted 9,9-fluoroalkyl fluorene diradical of the formula n n n n n n n n n n n n wherein S 1 , S 2 , D and B 1 have meanings given in the description that are useful as charge transport and emissive materials for the fabrication of electronic devices such as diodes, transistors, and photovoltaic devices. |