Photophysical processes of pyrene adsorbed onto porous glasses. Importance of evacuation temperature

✍ Scribed by Tsuneo Fujii; Akira Ishii; Hiroshi Satozono; Satoshi Suzuki; Nobou Takusagawa; Masakazu Anpo

• Book ID: 103994255
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 700 KB
• Volume: 84
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(94)03876-7

✦ Synopsis

The effect of the evacuation temperature used to remove residual solvent (cyclohexane) on the fluorescence s ectrum 4 and fluorescence decay curve of pyrene adsorbed on porous glass (average diameters, 40 8, and 3W 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 PG30O evacuated at temperatures (373 K) higher than the boiling temperature of cyciohexane 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 cxcimer-like conformations on the surfaces.