Redox-Responsive Porphyrin-Based Molecular Tweezers.
Authors devised a straightforward synthetic strategy leading to a new flexible pacman-like bisporphyrin. They established from electrochem., spectroelectrochem., theor. chem., UV/Vis, and ESR spectroscopy data that this redox-switchable architecture can be efficiently and reversibly converted from an "open" charge-repelled conformation into a "closed" cofacial arrangement. This open/close mol. motion, triggered by electron-transfers centered on $π$-dimerizable bipyridinium subunits, has been shown to allow the complexation of a bidentate heterocyclic ligand pinched between both metalloporphyrins as revealed by the modulation of the porphyrin-based exciton coupling phenomena. The redn. of both bipyridiniums in the open "charge-repelled" conformer thus leads to a large reorganization triggered by the formation of an intramol. $π$-dimer, the driving force of this mol. motion being the stabilization of both org. radicals in a sandwich-like structure. [on SciFinder(R)]
Références
- Titre
- Redox-Responsive Porphyrin-Based Molecular Tweezers.
- Type de publication
- Article de revue
- Année de publication
- 2012
- Auteurs
- Iordache, Adriana, Retegan Marius, Thomas Fabrice, Royal Guy, Saint-Aman Eric, and Bucher Christophe
- Revue
- Chem. - A Eur. J.
- Volume
- 18
- Pagination
- 7648–7653, S7648/1–S7648/25
- ISSN
- 0947-6539
- Mots-clés
- redox responsive porphyrin mol tweezer
Soumis le 12 avril 2018