Electronic Decoupling in C3-Symmetrical Light-Responsive Tris(Azobenzene) Scaffolds: Self-Assembly and Multiphotochromism
- Agostino GalantiAgostino GalantiUniversité de Strasbourg, CNRS, ISIS UMR 7006, 8 allée Gaspard Monge, 67000 Strasbourg, FranceMore by Agostino Galanti
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- Valentin Diez-CabanesValentin Diez-CabanesLaboratory for Chemistry of Novel Materials, University of Mons, Place du Parc 20, B-7000 Mons, BelgiumMore by Valentin Diez-Cabanes
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- Jasmin SantoroJasmin SantoroKarlsruhe Institute of Technology KIT, Institute for Nanotechnology, P.O. Box 3640, 76021 Karlsruhe, GermanyMore by Jasmin Santoro
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- Michal Valášek*Michal Valášek*[email protected]Karlsruhe Institute of Technology KIT, Institute for Nanotechnology, P.O. Box 3640, 76021 Karlsruhe, GermanyMore by Michal Valášek
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- Andrea MinoiaAndrea MinoiaLaboratory for Chemistry of Novel Materials, University of Mons, Place du Parc 20, B-7000 Mons, BelgiumMore by Andrea Minoia
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- Marcel Mayor*Marcel Mayor*[email protected]Karlsruhe Institute of Technology KIT, Institute for Nanotechnology, P.O. Box 3640, 76021 Karlsruhe, GermanyDepartment of Chemistry, University of Basel, St. Johannsring 19, 4056 Basel, SwitzerlandMore by Marcel Mayor
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- Jérôme Cornil*Jérôme Cornil*[email protected]Laboratory for Chemistry of Novel Materials, University of Mons, Place du Parc 20, B-7000 Mons, BelgiumMore by Jérôme Cornil
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- Paolo Samorì*Paolo Samorì*[email protected]Université de Strasbourg, CNRS, ISIS UMR 7006, 8 allée Gaspard Monge, 67000 Strasbourg, FranceMore by Paolo Samorì
Abstract

We report the synthesis of a novel C3-symmetrical multiphotochromic molecule bearing three azobenzene units at positions 1, 3, 5 of the central phenyl ring. The unique geometrical design of such a rigid scaffold enables the electronic decoupling of the azobenzene moieties to guarantee their simultaneous isomerization. Photoswitching of all azobenzenes in solution was demonstrated by means of UV–vis absorption spectroscopy and high performance liquid chromatography (HPLC) analysis. Scanning tunneling microscopy investigations at the solid–liquid interface, corroborated by molecular modeling, made it possible to unravel the dynamic self-assembly of such systems into ordered supramolecular architectures, by visualizing and identifying the patterns resulting from three different isomers, thereby demonstrating that the multiphotochromism is retained when the molecules are confined in two dimensions.
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