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R K Neely, S W Magennis, D T Dryden, and A C Jones (2004)
Evidence of tautomerism in 2-aminopurine from fluorescence lifetime measurements
J. Phys. Chem. B 108:17606–17610.
The fluorescence decay characteristics of 2-aminopurine (2AP) and 2-aminopurine riboside (2APr) have been investigated as a function of excitation and emission wavelength in aqueous and ethanolic solutions. Global analysis of the decay data shows that 2AP exists as two emitting species, whereas 2APr exists as a single species. This is attributed to 9H/7H tautomerism of 2AP. The proportion of 7H tautomer is estimated to be 20\% in ethanol and 40\% in water.