| abstract |
A compound of Formula I n n n n n n n n n n n n wherein at least one of R 1 or R 2 includes a polycyclic group selected from the group consisting of Formula A, Formula B, and Formula C: n n n n n n n n n n n n n n whereinn X 1 , X 2 , X 3 , and X 4 are independently CR A or N; X 5 , X 6 , X 7 , and X 8 are independently CR B or N; X 9 , X 10 , X 11 , and X 12 are independently CR C or N; X 13 , X 14 , X 15 , and X 16 are independently CR D or N; X 17 , X 18 , X 19 , and X 20 are independently CR E or N; X 21 , X 22 , X 23 , and X 24 are independently CR F or N; X 25 , X 26 , X 27 , and X 28 are independently CR G or N; X 29 , X 30 , X 31 , and X 32 are independently CR H or N; Y is selected from the group consisting of O, S, NR, and CRR′; the maximum number of N atoms that can connect to each other within each ring is two; with the proviso that R 1 does not connect to ring B, and R 2 does not connect to ring A, and wherein at least one of R C and R D of Formula A is a direct bond or an organic linker, one of R E and R F of Formula B is a direct bond or an organic linker, or one of R G , R H , and R N of Formula C is a direct bond or an organic linker. |