Photochemical hole burning of porphin-cross-linked polymethylmethacrylate

✍ Scribed by Kazuaki Sakoda; Kazuhiko Kominami

• Book ID: 103033104
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 416 KB
• Volume: 215
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)85707-u

✦ Synopsis

We synthesized polymetltylmethacrylate (PMMA) cross-linked with a tetraphenylporphin (TPP) derivative with four functional groups. The formation of the cross-linked polymer was confinned by means of the double detection technique of Se1 permeation chromatography. The irreversible broadening, or the spectral diffusion, of the photochemical hole burned in this crosslinked PMMA is less than in TPP merely dispersed in PMMA. Moreover, the high molecular weight component of the crosslinked PMMA, in which the cross-linkages are expected to be densely formed, exhibits still less spectral diffusion. From these observations, we conclude that the covalent bonds between the TPP molecule and the host polymer suppress the changes of the microscopic stereostructure in the vicinity of the TPP molecule and decrease its spectral ditTusion at low temperatures.