the present invention relates to a compound of general formula which can transport holes in an organic optoelectronic device , and to blends and solutions comprising the compound of general formula : wherein x is c , si or ge ; a is a group of formula wherein z is n , p , nh , o or s ; e is c 1 - 10 alkyl or h ; w is substituted or unsubstituted c 5 - 14 aryl or substituted or unsubstituted c 6 - 16 alkyl ; e is an integer from 1 to 4 ; and z is 1 or 2 ; b , c and d are each independently a , h , c 1 - c 12 alkyl , c 5 - 14 aryl or oh ; and a , b , c and d are each independently an integer from 1 to 5 .