Fluorescence Quenching by Oxygen: “Debunking” a Classic Rule

F.M. CABRERIZO; J. ARNBJERG; M. P. DENOFRIO; PETER R. OGILBY; ERRA BALSELLS, ROSA

Chemphyschem

Wiley

Lugar: UK; Año: 2010 vol. 11 p. 796 - 798

1439-4235

It has long been accepted that oxygen-induced deactivation of an organic molecule’s fluorescent state (i.e. the lowest excited singlet state, S1) proceeds exclusively via intersystem crossing (ISC) to produce the triplet excited state, T1.[1–4] Oxygen-induced S1!S0 internal conversion (IC) to produce the singlet ground state, S0, is thought not to occur. In a light-filled world where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. ground state, S0, is thought not to occur. In a light-filled world where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. ground state, S0, is thought not to occur. In a light-filled world where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. S1!S0 internal conversion (IC) to produce the singlet ground state, S0, is thought not to occur. In a light-filled world where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. ground state, S0, is thought not to occur. In a light-filled world where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. where S1 generation is commonplace and where molecular oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciable concentrations, this phenomenon can have significant implications. Among other things, it means that much O2-dependent photochemistry derives from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. from the T1 state and, as such, can yield unique and characteristic products. products. products. oxygen can be found at appreciabl