Effects of non-electrolyte polymers on photoinduced electron transfer reactions. Influence of aqueous poly(vinylalcohol) on quenching of tetraanionic porphyrins by methyl viologen

✍ Scribed by Michael D. Yanuck; Russell H. Schmehl

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 192 KB
• Volume: 122
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(85)85492-0

✦ Synopsis

The associaGon of waler soluble telraanionic porphyrins with poly(vinylalcoho1) (PVA) occurs in dilute solulions. as evidenced by absorption and emission spectral changes. Quenching or the emission or the free porphyrin fluorescence and the palladium(I1) complex phosphorsence by methyl viologen is suppressed upon addition of PVA (M = 78000). Flash cxcitalion of the Pd(l1) complex in solutions conlaining viologen (1 mM) and PVA ( 5 0.05%) results in charge sepamtion or photooxidized porphyrin and reduced viologen. The charge scparaGon yield increases 10 a maximum of 15% and the back reaction rake decreases with the addition of polymer umil a plateau is reached al approximalely 0.3% PVA.