Abstract A new group of fluorescent organic compounds having a variety of uses are described. They are especially useful as dye compounds in dye laser systems, and as photochemical agents in the treatment of diseased tissues using photodynamic therapy techniques. The compounds include a tri-cyclic compound having the following structure: <IMAGE> Preferably R1-R5=R9-R12=C; R7=B; R6 and R8=N; R14=lower n-alkyl or an electron withdrawing group such as CN-; R16 and R19 are independently selected from the group consisting of lower n-alkyl, a sulfate or an acid or salt thereof, or hydrogen; and R20=R21=F. Other compounds include compounds of the formula <IMAGE> (a) <IMAGE> (b) <IMAGE> (c) <IMAGE> (d) <IMAGE> (e)
A compound selected from the group consisting of: (a) ##STR50## wherein R is H or lower alkyl; (b) ##STR51## wherein X is CH or N, Y is CH or N, and R is lower alkyl, where at least one of X and Y is N; and (c) α,α'-dipyridylmethane-BF 2 .
Claim 2
Dependent Claim
50 words
A compound selected from the group consisting of: (a) ##STR50## wherein R is H or lower alkyl; (b) ##STR51## wherein X is CH or N, Y is CH or N, and R is lower alkyl, where at least one of X and Y is N; and (c) α,α'-dipyridylmethane-BF 2 .
Claim 3
Dependent Claim
43 words
The compound of claim 1 wherein the compound is (a) ##STR52## wherein R is H or lower alkyl; or (b) ##STR53## wherein X is CH, Y is N, and R is lower alkyl, where at least one of X and Y is N.
Claim 4
Dependent Claim
10 words
The compound of claim 2 wherein the compound is 2(a).
Claim 5
Dependent Claim
10 words
The compound of claim 2 wherein the compound is 2(b).
Claim 6
Dependent Claim
38 words
An imidazomethene-BF 2 complex according to the formula ##STR54## wherein R 1 and R 4 are H or lower alkyl and R 2 and R 3 are CH 3 ; or R 1 -R 4 are lower alkyl.
Claim 7
Dependent Claim
38 words
An imidazomethene-BF 2 complex according to the formula ##STR54## wherein R 1 and R 4 are H or lower alkyl and R 2 and R 3 are CH 3 ; or R 1 -R 4 are lower alkyl.
Claim 8
Dependent Claim
12 words
The compound of claim 5 wherein the compound is tetramethyl-2,2'-biimidazole-BF 2 .