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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...
We have investigated the emission properties of 8-azaxanthine (8-azaXan) and its triazolo N-alkyl derivatives, with particular emphasis on N(8)-methyl-8-azaXan. In aqueous medium, both 8-azaXan and its 8-alkyl congener emit at 420nm, with an unusually large Stokes’ shift, and decay times of 9 and 12ns, respectively. With the parent 8-azaXan, emission is observed over a narrow pH range (2–6), where...
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