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Fluorescence emission properties of 2,6-diamino-8-azapurine (2-amino-8-azaadenine) in aqueous medium were examined. The title compound exhibits strong fluorescence centered at 365nm, with quantum yield 0.40 and bi-exponential decay with lifetimes of ∼7.5 and ca. 0.2ns. The spectral properties of 2,6-diamino-8-azaapurine are very similar to those of its 9-alkoxyphosphonate, suggesting that the protomer...
Fluorescence emission properties of 8-aza-isoguanine (z8isoGua) and some of its N-methyl derivatives are described. Two fluorescence bands, with maxima at ∼360 and ∼420nm and distinct decay times, are observed in 8-azaisoguanine and its N(8)-methyl derivative, in aqueous medium at pH 4–5 and 5–9, respectively, where both compounds adopt neutral forms in their ground states. The long-wavelength band...
Fluorescence emission properties of 8-azacaffeine, 8-azatheophylline and other N-alkylated 8-azaxanthines (8-azaXan) have been examined. It is shown that N-methylated 8-azaxanthines, as well as 8-azatheophylline, are highly fluorescent in aqueous medium as the neutral, and, in some instances, also as the monoanionic, forms. 8-Azacaffeine exhibits moderate emission, but its isomer, 1,3,8-trimethyl-8-azaXan,...
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