. . "wherein R1, R2, R3, R4, and R5 is an atom selected from the group consisting of carbon and nitrogen wherein between one and four of the R1, R2, R3, R4, and R5 groups are nitrogen and between one and four of the R1, R2, R3, R4, and R5 groups are carbon; and R11, R22, R33, R44, and R55 are each independently selected from the group consisting of hydrogen, carbon, sulfur, oxygen, and nitrogen." . .