| abstract |
There is provided a compound having Formula I In the formula: R 1 can be aryl, alkyl, silyl, or deuterated analogs thereof; R 2 can be aryl, alkyl, silyl, or deuterated analogs thereof; R 3 can be H, D, alkyl, silyl, deuterated alkyl, or deuterated silyl; and R 4 is the same or different at each occurrence and is H,D, aryl, alkyl, silyl, deuterated aryl, deuterated alkyl, or deuterated silyl. |