PHOTOCHEMISTRY IN POROUS MATERIALS .3. OXYGEN QUENCHING OF THE FLUORESCENCE OF FLUORANTHENE ADSORBED ON SILICA-GEL OF UNIFORM PORE-SIZE

The luminescence quenching reaction of fluoranthene by molecular oxyge n on MCM-41, a silicagel of uniform pore size, was studied al room tem perature by time-resolved and steady-state fluorescence spectroscopy-T he quenching reaction is well described by the Langmuir-Hinshelwood-(L H)-model. By applying this model to the experimental results rate cons tants of the quenching reaction, equilibrium constants of oxygen adsor ption, rate constants of oxygen desorption and heats of oxygen adsorpt ion were derived.