Examines intersystem crossing effects in 5-azacytosine, indicating critical photophysical behavior.
Tautomerism influences the photophysics of aza-substituted cytosine. Internal conversion to the ground state dominates in both tautomers of 5-azacytosine. Measurable intersystem crossing to the triplet manifold is only observed in the keto tautomer.
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Duwal et al. (2026) studied this question.
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