2
|
Odobel F, Séverac M, Pellegrin Y, Blart E, Fosse C, Cannizzo C, Mayer CR, Elliott KJ, Harriman A. Coupled sensitizer-catalyst dyads: electron-transfer reactions in a perylene-polyoxometalate conjugate. Chemistry 2009; 15:3130-8. [PMID: 19197929 DOI: 10.1002/chem.200801880] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Ultrafast discharge of a single-electron capacitor: A variety of intramolecular electron-transfer reactions are apparent for polyoxometalates functionalized with covalently attached perylene monoimide chromophores, but these are restricted to single-electron events. (et=electron transfer, cr=charge recombination, csr=charge-shift reaction, PER=perylene, POM=polyoxometalate).A new strategy is introduced that permits covalent attachment of an organic chromophore to a polyoxometalate (POM) cluster. Two examples are reported that differ according to the nature of the anchoring group and the flexibility of the linker. Both POMs are functionalized with perylene monoimide units, which function as photon collectors and form a relatively long-lived charge-transfer state under illumination. They are reduced to a stable pi-radical anion by electrolysis or to a protonated dianion under photolysis in the presence of aqueous triethanolamine. The presence of the POM opens up an intramolecular electron-transfer route by which the charge-transfer state reduces the POM. The rate of this process depends on the molecular conformation and appears to involve through-space interactions. Prior reduction of the POM leads to efficient fluorescence quenching, again due to intramolecular electron transfer. In most cases, it is difficult to resolve the electron-transfer products because of relatively fast reverse charge shift that occurs within a closed conformer. Although the POM can store multiple electrons, it has not proved possible to use these systems as molecular-scale capacitors because of efficient electron transfer from the one-electron-reduced POM to the excited singlet state of the perylene monoimide.
Collapse
Affiliation(s)
- Fabrice Odobel
- University of Nantes, CEISAM, Chimie Et Interdisciplinarité, Synthèse, Analyse, Modélisation, Faculté des Sciences et des Techniques, 2, rue de la Houssinière, BP 92208, 44322 Nantes Cedex, France
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Tsukahara K, Sawai N, Hamada S, Koji K, Onoue Y, Nakazawa T, Nakagaki R, Nozaki K, Ohno T. Photophysical and Photochemical Properties of Viologen-Linked N-Alkylporphyrin Diads and Their Metal Complexes. J Phys Chem B 1999. [DOI: 10.1021/jp984221r] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Keiichi Tsukahara
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Naoko Sawai
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Satoko Hamada
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Kayoko Koji
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Yoshiaki Onoue
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Takashi Nakazawa
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Ryoichi Nakagaki
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Koichi Nozaki
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| | - Takeshi Ohno
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, Nara Ikuei High School, Nara 630, Japan, Faculty of Pharmaceutical Sciences, Kanazawa University, Kanazawa, Ishikawa 920, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560, Japan
| |
Collapse
|