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Three tricyclic 1,2‐dioxetane derivatives, 1a, 2a and 3a were synthesized from their corresponding 1,4‐dioxin acenaphthylene compounds, 1, 2 and 3, by reaction with singlet‐oxygen (1O2) in dichloromethane. Evidence for the formation of the dioxetanes 1a, 2a and 3a is provided by the chemiluminescence (CL) that corresponds to the emission from the electronically excited diesters 1b*, 2b* and 3b*, which...
Exciplex formation of excited 4-phenylbenzophenone (PBP) triplet with triethylamine (TEA) in organic solution has been studied by steady state and pulse-laser photo-luminescence measurements. Direct evidence for triplet exciplex formation was provided by the observation of emission at longer wavelengths than that of the phosphorescence of PBP. The quenching mechanism is proposed to involve a π, π...
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