Patent ID: 7052783

Claim:
A compound of the following formula: wherein each of R 1 –R 4 is, independently, H, substituted or unsubstituted C 1-6 alkyl, OH, C 1-6 alkoxy, N(R 6 )(R 7 ), in which each of R 6 and R 7 is, independently, H or substituted or unsubstituted C 1-6 alkyl, NO 2 , CN, or CO 2 R 8 , in which R 8 is H or C 1-6 alkyl; and wherein R 5 is H, substituted or unsubstituted C 1-6 alkyl, substituted or unsubstituted C 2-6 alkenyl, substituted or unsubstituted C 2-6 alkynyl, unsubstituted C 6-20 aryl or C 6-20 aryl substituted with OH, C 1-6 alkoxy or N(R 26 )(R 27 ); alkylaryl in which the aryl moiety is substituted with one or more C 1-6 alkyl groups further substituted with hydroxyl, protected hydroxyl, amino, protected amino, carboxy, protected carboxy, alkoxy, halo, CN, or NO 2 , substituted or unsubstituted C 4-20 heteroaryl, C 10-20 diarylaminoaryl, or is absent, or B and D, together with R 5 and R 11 , are substituted or unsubstituted aryl; in which each of R 26 and R 27 is, independently, H, substituted or unsubstituted C 1-6 alkyl, substituted or unsubstituted aryl, substituted or unsubstituted alkylaryl, NO 2 , CN, or CO 2 R 28 , in which R 28 is H or C 1-6 alkyl; wherein A is O, S, N(R 9 ) in which R 9 is absent, H, substituted or unsubstituted alkyl, or substituted or unsubstituted aryl, N═N, or N═C(R 10 ) in which the C is adjacent to B and in which R 10 is substituted or unsubstituted alkyl, or substituted or unsubstituted aryl; wherein B is C or N; wherein D is N, NH, or C(R 11 ) in which R 11 is substituted or unsubstituted alkyl, or substituted or unsubstituted aryl, or B and D, together with R 5 and R 11 are substituted or unsubstituted aryl; and wherein E is C or Si; provided that when A is O and D is N, then B is C and the floating double bond is between B and D; further provided that when A is N(R 9 ) and R 9 is absent, then B is N, R 5 is absent, D is NH, and the floating double bond is between A and B; further provided that when A is N═N, then B is C, D is N, and the floating double bond is between B and D; further provided that when A is N═C(R 10 ), then B is N, R 5 is absent, D is C(R 11 ), and the floating double bond is between B and D; further provided that when A is N(R 9 ) and R 9 is H, alkyl, or aryl, then B is C, D is C(R 11 ), and the floating double bond is between B and D; and further provided that when A is O or S and D is C(R 11 ), then B is C and the floating double bond is between B and D.