Patent ID: 6448008
Filing Date: 2002-09-10
Classification: C07H,C09B,G01N

Abstract:
A fluorescent compound of the formula: wherein:X1, X2 are independently selected from the group consisting of â€”Oâ€”, â€”Sâ€”, â€”C(CH3)2 and â€”C&boxH;CH2; Y1, Y2 are nonmetal atoms required to form a benzo-condensed or naphtha-condensed ring; Q is a conjugated moiety that increases the fluorescent quantum yield and the stability of the compound; R1 and R2 are independently selected from the group consisting of H, C1-C4, alkyl, alkylensulfonic group and alkylensulfonate group wherein the alkylene group has from 1 to 4 carbon atoms; R3, R4 and R5 are independently selected from the group consisting of H, a sulfonic group, a sulfonate group, alkylensulfonic, alkylensulfonate and â€”SO2NH(CH2)mâ€”Wâ€”(CH2)nZ, wherein alkylene has 1 to 4 carbon atoms, with the proviso that at least one of R1 to R5 contains a sulfonic or sulfonate group; W is absent or is a group selected from the group consisting of â€”SO2NHâ€”, â€”Oâ€”, â€”COOâ€”, and â€”CONHâ€”; n=0-12 and m=0-12 with he provisos that m+n&lE;12 and at least one of m and nâ‰ 0 ; and Z is, or contains a N, O or S nucleophile functionality or is, or contains a functionality capable of reacting with N, O or S nucleophiles.