Photoacoustic measurements of porphyrin triplet‐state quantum yields and singlet‐oxygen efficiencies
Chemistry–A European Journal, 1998•Wiley Online Library
Photoacoustic calorimetry and luminescence techniques were used to measure singlet
oxygen quantum yields (ΦΔ) of selected 5, 10, 15, 20‐tetrakis (aryl) porphyrins and of the
novel chlorin shown. The use of validated photoacoustic references removes some
inconsistencies existing in the literature. Excitation of halogenated porphyrins produces high
yields of long‐lived triplet states that efficiently transfer their energy to singlet oxygen. A
route for red‐absorbing, efficient singlet‐oxygen photosensitisers is described.
oxygen quantum yields (ΦΔ) of selected 5, 10, 15, 20‐tetrakis (aryl) porphyrins and of the
novel chlorin shown. The use of validated photoacoustic references removes some
inconsistencies existing in the literature. Excitation of halogenated porphyrins produces high
yields of long‐lived triplet states that efficiently transfer their energy to singlet oxygen. A
route for red‐absorbing, efficient singlet‐oxygen photosensitisers is described.
Abstract
Photoacoustic calorimetry and luminescence techniques were used to measure singlet oxygen quantum yields (ΦΔ) of selected 5,10,15,20‐tetrakis(aryl)porphyrins and of the novel chlorin shown. The use of validated photoacoustic references removes some inconsistencies existing in the literature. Excitation of halogenated porphyrins produces high yields of long‐lived triplet states that efficiently transfer their energy to singlet oxygen. A route for red‐absorbing, efficient singlet‐oxygen photosensitisers is described.
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