Patent ID: 8901300

Claim:
A tetraazapyrene compound of formula (I): wherein: R 1 and R 3 are Cl or Br and R 2 and R 4 are H; or R 1 , R 2 , R 3 , and R 4 are Cl or Br; or R 1 , R 2 , R 3 , and R 4 are a C 6-14 aryloxy or a C 6-14 arylthio; R 5 and R 6 are each independently H, a C 1-30 alkyl, a C 1-30 haloalkyl, an optionally halogen-substituted C 6-14 aryl, and an optionally halogen-substituted C 7-20 arylalkyl.