Patent ID: 7160732
Filing Date: 2007-01-09
Classification: C09B,G01N

Abstract:
1. A fluorescein-based ligand, comprising a ligand having one of the following structures: wherein, independently for each occurrence: K is optionally present and if present, is any one or more of the following substituents at one or more of the substitutable positions of the indicated aromatic ring: alkyl, alkenyl, alkynyl, amino, acyl, acyloxy, acylamino, alkylthio, alkoxyl, nitro, halogen, sulfhydryl, cyano, hydroxyl, carbamoyl and trifluoromethyl. A is —CH Z is hydrogen or any hydroxyl-protecting group; Q is O, S or Se; K is optionally present and if present, is any one or more of the following substituents at one or more of the substitutable positions of the indicated aromatic ring: alkyl, alkenyl, alkynyl, amineo, acyl, acyloxy, acylamino, alkylthio, alkoxyl, nitro, halogen, sulfhydryl, cyano, hydroxyl, carbamoyl and trifluoromethyl; V is (i) a chemical moiety comprising at least three Lewis basic moieties each independently selected from the group of Lewis basic moieties consisting of: amino, amido, nitro, nitroso, amino alcohol, nitrile, imino, isonitrile, cyanate, isocyanate, phosphate, phosphonate, phosphite, phosphine, phosphine oxide, phosphorothioate, phosphoramidate, phosphonamidite, hydroxyl, carbonyl, aldehyde, ketone, ether, carbamoyl, thiol, sulfide, thiocarbonyl, thioether, mercaptan, sulfonic acid, sulfoxide, sulfate, sulfonate, sulfone, sulfonamide, sulfamoyl, sulfinyl, or heterocyclyl, wherein the at least three Lewis basic moieties are capable of forming a tridentate chelate and at least one of the Lewis basic moieties is heterocyclyl or (ii) an imino group, wherein said imino group is capable of forming a bidentate chelate; Y is O, S, Se, NR, or C(CH Z2 is N, HOOCCH E is optionally present and if present, is any one or more of the following substituents at one or more of the substitutable positions of the indicated aromatic ring: alkyl, alkenyl, alkynyl, amino, acyl, acyloxy, acylamino, alkylthio, alkoxyl, nitro, halogen, sulfhydryl, cyano, hydroxyl, carbamoyl and trifluoromethyl; and D is —CH