Photophysical processes of pyrene adsorbed onto porous glasses. Importance of evacuation temperature
Review articleOpen access
1994/12/27 Full-length article DOI: 10.1016/1010-6030(94)03876-7
Journal: Journal of Photochemistry and Photobiology A: Chemistry
AbstractThe effect of the evacuation temperature used to remove residual solvent (cyclohexane) on the fluorescence spectrum and fluorescence decay curve of pyrene adsorbed on porous glass (average diameters, 40 Å and 300 Å; PG40 and PG300) was investigated. The “growing-in” phenomenon in the initial stage of the decay curve was observed for PG300 evacuated at temperatures (338 K) lower than the boiling temperature of cyclohexane (353 K). However, this phenomenon was not observed for PG300 evacuated at temperatures (373 K) higher than the boiling temperature of cyclohexane and for all PG40 specimens. Thus the evacuation temperature after adsorption plays an important role in the photophysical properties of pyrene molecules and determines whether or not they form excimer-like conformations of the surfaces.
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