Fluorescent nucleoside derivatives: Luminescence study of 4-dimethylaminopyridinium chloride derived from guanosine.

Photophysical properties of fluorescentN-[2-amino-9-(2',3',5'-tri-O-acetyl-β-D-ribofuranosyl)-purin-6-yl]-4-dimethylaminopyridinium chloride (GDMAP) are determined in view of its possible use as a probe in DNA. The fluorescence intensity of GDMAP increases and exhibits doubleexponential decay in the presence of common nucleosides. The formation of ground-state complexes with nucleosides is inferred from absorption and emission measurements.