What is it about?
The synthesis of (porphyrinato)Sn-viologen 1 and its supramolecular complexation with cucurbit[7]uril (CB[7]) were studied. The cyclic voltammetric study supports that the binding affinity of the radical cation forms is comparable to that of the di-cation viologen toward CB[7]. The fluorescence arising from the porphyrin moiety is significantly quenched upon the complexation of 1 with CB[7]. The time-resolved fluorescence and transient absorption spectroscopic studies reveal that the photoinduced electron transfer takes place from Sn(IV) porphyrin to viologen in the first excited singlet state as well as triplet state, and the electron transfer in the triplet state is observed to be more or less slow down by inclusion of viologen in CB[7].
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Why is it important?
The published results are important to provide a model to create the artificial systems capable of solar energy conversion by manipulating photoinduced electron transfer processes.
Perspectives
It was a great pleasure to write this article as I have had long standing collaborations with co-authors. This article also lead to a greater involvement in solar energy conversion as well as fundamental photophysical study of supramolecular system .
Professor Emeritus Minjoong Yoon
Chungnam National University
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This page is a summary of: Photoinduced electron transfer upon supramolecular complexation of (porphyrinato)Sn-viologen with cucurbit[7]uril, Photochemical & Photobiological Sciences, January 2019, Springer Science + Business Media,
DOI: 10.1039/c9pp00145j.
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