Abstract:
A set of 4,7-dichlororhodamine compounds useful as fluorescent dyes are disclosed having the structures wherein R -R are hydrogen, fluorine, chlorine, lower alkyl, lower alkene, lower alkyne, sulfonate, sulfone, amino, amido, nitrile, lower alkoxy, linking group, or, when taken together, R and R is benzo, or, when taken together, R and R is benzo; R -R , R -R and R may be hydrogen, fluorine, chlorine, lower alkyl, lower alkene, lower alkyne, sulfonate, sulfone, amino, amido, nitrile, lower alkoxy, linking group; R and R may be hydrogen, lower alkyl, lower alkene, lower alkyne, phenyl, aryl, linking group; Y -Y are hydrogen, lower alkyl, or cycloalkyl, or, when taken together, Y and R , Y and R Y and R , and/or Y and R is propano, ethano, or substituted forms thereof, and X -X taken separately are hydrogen, chlorine, fluorine, lower alkyl, carboxylate, sulfonate, hydroxymethyl, and linking group, or any combinations thereof In another aspect, the invention includes reagents labeled with the 4,7-dichlororhodamine dye compounds, including deoxynucleotides, dideoxynucleotides, and polynucleotides. In an additional aspect, the invention includes methods utilizing such dye compounds and reagents including dideoxy polynucleotide sequencing and fragment analysis methods.