Patent ID: 7332502

Claim:
A compound of the following formula: wherein each of R 1 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 , R 14 , R 15 , and R 16 , independently, is H, halogen, R, OH, OR, NH 2 , NHR, or NRR′; and each of R 2 , R 3 , and R 4 , independently, is halogen, R, OH, OR, NH 2 , NHR, or NRR′; each of R and R′, independently, being alkyl, aryl, cyclyl, heteroaryl, or heterocyclyl; X is an anion; and n equals the absolute value of the charge of X so that the overall charge of the compound is 0.