Physical Chemistry

Thionation Induces Efficient Generation of Excited Triplet State and Singlet Oxygen: Heavy Atom-Free BODIPY Photosensitizers Based on S1(n,π*) State

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Abstract

The attachement of SR (R is alkyl or phenyl) makes BODIPY efficiently generate excited triplet state (T1) and singlet oxygen with quantum yield up to 0.82 (compared to 0.10 of parent BODIPY). This affords an efficient method to synthesize heavy atom free photosensitizers. This efficient T1 formation is because SR presence leads to a new excited state S1(n,pi*) with an energy smaller but close to the usual S1(pi,pi*) state.

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