Patent ID: 8022097

Claim:
A compound having general formula I, wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are defined according to one of the following combinations: (R 1 is dipyrromethane or substituted dipyrromethane and R 2 , R 3 , R 4 , R 5 , R 6 are hydrogen); or (R 2 and R 3 are identical pyrroles or substituted pyrroles with identical R 7 , R 8 , and R 9 groups and R 1 , R 4 , R 5 , R 6 are hydrogen), or (R 1 and R 4 are identical pyrroles or substituted pyrroles with identical R 7 , R 8 , and R 9 groups; and R 2 , R 3 , R 5 , R 6 are hydrogen); or (R 2 , R 3 , R 5 , and R 6 are identical pyrroles or substituted pyrroles with identical R 7 , R 8 , and R 9 groups; and R 1 and R 4 are hydrogen); wherein R 7 , R 8 , and R 9 are hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, vinyl, Cl, Br, CN, CHO, CH 2 OH, COOR 10 , or aryl, or their combination; and wherein R 10 is hydrogen, methyl, ethyl, tert-butyl, phenyl or benzyl; and wherein aryl has the general formula II, wherein R 11 , R 12 , R 13 are hydrogen, methyl, ethyl, propyl, methoxy, CN, F, Cl, or Br, or their combination.