Photoinduced electron transfer in viologen-linked porphyrins (m-PCnV)

✍ Scribed by Sumio Noda; Hideyuki Hosono; Ichiro Okura; Yasuhiko Yamamoto; Yoshio Inoue

• Book ID: 103993535
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 447 KB
• Volume: 53
• Category: Article
• ISSN: 1010-6030
• DOI: 10.1016/1010-6030(90)87144-z

✦ Synopsis

Compounds containing a viologen linked to a porphyrin via a number (n = 3 -6) of methylene groups were synthesized. Photoinduced long-range electron transfer between the porphyrin and the viologen is observed. The photoexcited singlet state of the porphyrin is quenched by the viologen in the viologen-linked porphyrins. The fluorescence decay profiles of the viologen-linked porphyrins consist of the sum of two first-order decays with short and long lifetimes. The short lifetime arises from the direct quenching of the photoexcited singlet state of the porphyrin by the linked viologen. The intramolecular electron transfer process from the porphyrin to the viologen becomes less effective with increasing methylene chain length.