Abstract
Triplet excited states of photosensitive molecules play a special role in the photocatalytic and photosensitized processes.[1] Phosphorescence (most often, it is the radiative transition T1-S0) is unresolved and the lifetime of the triplet states is 10-3 s and above usually, whereas the characteristic lifetime of singlet states is estimated as 10-9-10-8 s. In the case of tetrapyrrole photosensitizers (TPS), the generation of long-lived triplet excited states with high quantum yield is typical for metal-free porphyrins and related compounds, as well as their complexes with d0and d10-metals, i.e. elements containing no unpaired d-electrons. The most photobiologically important example of TPS with d0-metals is chlorophyll containing magnesium ion. Under photoexcitation of chlorophyll a (Mg-Chl) generation of the first triplet state T1 with a high quantum yield (60%) is observed.[2] Energy of excited state T1 is 11325 cm -1
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