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The characteristics of the fluorescence and phosphorescence emission of 2‐amino‐4 (3H) pteridinone (or pterin) in aqueous solutions are pH dependent. The room temperature fluorescence quantum yield is low and is maximum at pH = 10 (φF∼ 0.057). The 77K phosphorescence emission consists of two overlapping emissions originating from τ* triplet states. In agreement with low temperature results, the 353nm laser flash photolysis makes it possible to detect at pH 9.2, two transient triplet absorptions (τ1∼ 0.3 μs and τ2∼ 2.3 μs). The longer lived triplet is characterized by φTM∼ 0.20 and ∼ (550nm) = 2000 M−1 cm−1. It reacts with the solvent forming the semireduced pterin with a quantum yield φR∼ 0.06. The photosensitizing properties of pterin have been studied by laser flash spectroscopy and steady state irradiations. Photoreactions implying singlet oxygen formation are shown to occur. Laser flash spectroscopy indicates that the pterin triplet is reduced by amino acids and nucleic acid bases. Corresponding bimolecular reaction rate constants have been measured.
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Chahidi et al. (1981) studied this question.
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