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Quenching molecular fluorescence mechanism

Dissolved molecular oxygen can quench both fluorescence and phosphorescence albeit with different efficiencies and mechanisms. The extent of oxygen quenching on fluorescence is strongly dependent on the fluorophore, whereas for phosphorescence the intensity is always adversely affected. This can be rationalized using the Stern-Volmer equation [4] assuming no other quenching species are present. [Pg.2744]

Isomerization induced by molecular oxygen. The fluorescent states of ROH, RAc, and RBA in n-hexane are efficiently quenched by molecular oxygen in a process which quantitatively generates the corresponding triplets and which is also associated with enhancement of the (all-trans) -+ (cis) photoreaction. The mechanism of the 02 induced isomerization is likely to involve triplets produced by the quenching process. [Pg.130]

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See also in sourсe #XX -- [ Pg.576 ]



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