Patent ID: 8476462

Claim:
A composition of matter comprising a fluorescent compound wherein: m is 1 or 2; A is independently selected from the group consisting of O, Se, Te and CR 2 wherein, R is independently selected from the group consisting of Me, Et, C 3 -C 16 alkyl, alkyl ether groups and oligo ethylene glycol groups containing 2 to 20 oxygen atoms; Z is independently selected from the group consisting of Me, Et, and C 3 -C 16 alkyl; L is independently selected from the group consisting of F, Cl, Br, O-aryl, —NH—(Y)—NR 2 and —NH—(Y)—NR—CO—(Y)—COT wherein, Y is selected from the group consisting of a C 1 -C 18 alkyl chain, an ether linkage, an aromatic linkage, C 1 -C 12 cycloalkyl and an oligoethylene glycol linkage containing 2 to 20 oxygen atoms, R in this instance is independently selected from the group consisting of H, Me, Et, and C 3 -C 16 alkyl; and wherein T is independently selected from the group consisting of OH, Cl, Br, O—(C 1 -C 16 ) alkyl, O-aryl, N-hydroxysuccinimide ester, hydroxybenzotriazole ester, haloalkylacetamide, —NH-maleimide, thiocyanate, cyanate, phosphoramidite, symmetrical anhydrides and unsymmetrical acid anhydrides.