Patent ID: 6136612
Filing Date: 2000-10-24
Classification: C09B,G01N,Y10S

Abstract:
A fluorescent compound and its valence tautomers of the formula: ##STR11## wherein R.sub.1 is a functionalized group of the formula --(CH.sub.2).sub.j Y wherein Y is selected from the group consisting of COOH and phthalimido; R.sub.2 is a functionalized group of the formula --(CH.sub.2).sub.k Y', wherein Y' is selected from the group consisting of COOH and phthalimido; M.sup.+ is a counterion selected from the group consisting of ammonium, alkali metal cations, and alkaline earth metal cations; n=1 to 4; m=1 to 4; j=2 to 10; k=2 to 10; and wherein Q is selected from the group consisting of: ##STR12## wherein X is selected from the group consisting of hydrogen, F, Cl, Br, I, and substituted aryl, wherein said aryl substituent is selected from the group consisting of SO.sub.3 H, COOH, NH.sub.2, CHO, NCS, epoxy, and COOZ, wherein Z represents a leaving group and i=0 or 1.