Patent ID: 8531100

Claim:
A compound represented by Formula II: wherein: R 1 is the same or different at each occurrence and is selected from the group consisting of D, alkyl, alkoxy and aryl, where adjacent R 1 groups may be joined together to form a 5- or 6-membered aliphatic ring; Ar 1 through Ar 4 are the same or different and are selected from the group consisting of aryl groups; and b is the same or different at each occurrence and is an integer from 0 to 5; wherein at least one b is greater than 0 and at least one R 1 is selected from the group consisting of alkyl, alkoxy and aryl, where adjacent R 1 groups may be joined together to form a 5- or 6-membered aliphatic ring; and wherein the compound is at least 10% deuterated.