Electrochromic switching of evaporated thin films of bulky, electronic deficient metallo-phthalocyanines
| Autor: | Derck Schlettwein, Łukasz Łapok, Martin Lener, Stefanie Nagel, Christopher Keil, Robert Gerdes, Sergiu M. Gorun |
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| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: |
Isosbestic point
Aqueous solution Chemistry Inorganic chemistry chemistry.chemical_element Electrolyte Photochemistry Electrochemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Electrochromism Physical vapor deposition Lithium Physical and Theoretical Chemistry Thin film |
| Popis: | Thin films of four-coordinated perfluoroalkyl-substituted phthalocyanines were prepared by physical vapor deposition. The electrochemical redox characteristics and simultaneous changes in the optical absorbance spectra of the films (40−215 nm) in contact with an aqueous LiCl electrolyte for charge compensation were compared to results obtained for the molecules dissolved in an organic solvent. A positive shift of the potential of the first ring-centered reduction relative to the unsubstituted or perfluorinated phthalocyanines was confirmed for solutions and clearly established for thin films. Following a conditioning of the films during the first reduction, chemically reversible and thermodynamically quasi-reversible reduction and reoxidation reactions were observed. A clear correlation of the injected charge with the appearance of isosbestic points characterized the reaction as a one-electron reduction. Diffusion limitation by charge-balancing lithium counterions could be detected only for thicker films ... |
| Databáze: | OpenAIRE |
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