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| Hauptseite > Publikationsdatenbank > Potential-induced redox Switching in Viologen Self-assembled Monolayers - An ATR-SEIRAS Approach > print |
| Hauptseite > Publikationsdatenbank > Potential-induced redox Switching in Viologen Self-assembled Monolayers - An ATR-SEIRAS Approach > print |
| 001 | 58667 | ||
| 005 | 20190625110906.0 | ||
| 024 | 7 | _ | |2 DOI |a 10.1021/jp073208g |
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| 041 | _ | _ | |a eng |
| 082 | _ | _ | |a 540 |
| 084 | _ | _ | |2 WoS |a Chemistry, Physical |
| 084 | _ | _ | |2 WoS |a Nanoscience & Nanotechnology |
| 084 | _ | _ | |2 WoS |a Materials Science, Multidisciplinary |
| 100 | 1 | _ | |a Han, B. |b 0 |u FZJ |0 P:(DE-Juel1)VDB35518 |
| 245 | _ | _ | |a Potential-induced redox Switching in Viologen Self-assembled Monolayers - An ATR-SEIRAS Approach |
| 260 | _ | _ | |a Washington, DC |b Soc. |c 2007 |
| 300 | _ | _ | |a 13855 - 13863 |
| 336 | 7 | _ | |a Journal Article |0 PUB:(DE-HGF)16 |2 PUB:(DE-HGF) |
| 336 | 7 | _ | |a Output Types/Journal article |2 DataCite |
| 336 | 7 | _ | |a Journal Article |0 0 |2 EndNote |
| 336 | 7 | _ | |a ARTICLE |2 BibTeX |
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| 336 | 7 | _ | |a article |2 DRIVER |
| 440 | _ | 0 | |a Journal of Physical Chemistry C |x 1932-7447 |0 16841 |v 111 |
| 500 | _ | _ | |a Record converted from VDB: 12.11.2012 |
| 520 | _ | _ | |a Monolayers of viologens (N-alkyl-N'-(n-thioalkyl)-4,4'-bipyridinium bromide, n = 6, 8, 10) have been self-assembled from ethanolic solution onto gold substrates. Their structure and redox functionality were studied by cyclic voltammetry and in situ ATR-SEIRAS. Voltammetric experiments revealed that the first redox process, V2+ <-> V center dot+, is reversible, whereas the second redox process, V center dot+ <-> V-0, is quasi reversible. The V2+ adlayer exhibits a sandwich-like structure. Van der Waals interactions between the alkyl chains lead to two well-ordered hydrophobic layers, with the redox-active bipyridinium unit enclosed in between. The alkyl chains are aligned in an all-trans configuration in a tilted orientation with respect to the surface normal and exhibit a slight conformational disorder. The long axis of the central bipyridinium rings is also tilted. The alignment of V2+ is stabilized by interplanar pi-pi stacking and electrostatic coulomb interactions. Both monomers and dimers of V center dot+ coexist in the V center dot+ adlayer. The molecular alignment of the V center dot+ adlayer is stabilized by the strong vibronic coupling within the dimers and the pi-pi stacking between the monomers. Increasing length of the alkyl chain results in more tilted bipyridinium units, and favors both the dimerization and the alignment of V center dot+ within the SAMs. The complex reaction, V2+ - V center dot+, is described as electron transport from the electrode to the V2+ moiety followed by the dimerization of V center dot+, the delocalization of the radical electrons, and the migration of coadsorbed ClO4- anions. |
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| 700 | 1 | _ | |a Li, Z. |b 1 |u FZJ |0 P:(DE-Juel1)VDB2436 |
| 700 | 1 | _ | |a Wandlowski, Th. |b 2 |u FZJ |0 P:(DE-Juel1)VDB9859 |
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| 700 | 1 | _ | |a Mayor, M. |b 4 |0 P:(DE-HGF)0 |
| 773 | _ | _ | |a 10.1021/jp073208g |g Vol. 111, p. 13855 - 13863 |p 13855 - 13863 |q 111<13855 - 13863 |0 PERI:(DE-600)2256522-X |t The @journal of physical chemistry |v 111 |y 2007 |x 1932-7447 |
| 856 | 7 | _ | |u http://dx.doi.org/10.1021/jp073208g |
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| 914 | 1 | _ | |y 2007 |
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