Abstract— Photochemical formation of metastable species from 1,3‐diphenylisobenzofuran (DPBF) in solutions has been investigated. On irradiation at 410 nm, in the presence of oxygen, DPBF is bleached. The bleached solutions show two fluorescence bands, one at ˜380nm and the other at ˜420nm. None of these fluorescence bands are due to o‐dibenzoylbenzene, which is the main stable product formed on photo‐bleaching of DPBF in the presence of O2. The species showing fluorescence at ˜380nm and ˜420nm are also formed on reaction of DPBF with 1O2 and undergo further reactions with light as well with 1O2; the resulting products do not all show fluorescence. After the photo‐bleached solutions have stood for some time in the dark, or are warmed, regeneration of DPBF seems to occur. The triplet energy of DPBF has been estimated by energy transfer studies to be between 22 and 29 kcal/mol (between 92 and 121 kJ mol‐1).
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