Molecular suppression of the pimerization of viologens (=4,4 `-bipyridinium derivatives) attached to nanocrystalline titanium dioxide thin-film electrodes
Autor(en): | Felderhoff, M Heinen, S Molisho, N Webersinn, S Walder, L |
Stichwörter: | CATION RADICALS; Chemistry; Chemistry, Multidisciplinary; ELECTROCHROMISM; TIO2 FILMS; WINDOWS | Erscheinungsdatum: | 2000 | Herausgeber: | WILEY-V C H VERLAG GMBH | Journal: | HELVETICA CHIMICA ACTA | Volumen: | 83 | Ausgabe: | 1 | Startseite: | 181 | Seitenende: | 192 | Zusammenfassung: | Twelve viologens. i.e., 4,4'-bipyridinium derivatives 1-12, were examined for their use as electrochromic material when attached to nanocrystalline titanium dioxide thin-film electrodes. Eight of these (1-4, 7-8, 10, and 12) are new, and their synthesis is included. The modifier compounds consist of one to four bipyridinium subunits with linear or dendritic architecture, equipped with one to three TiO2-anchoring phosphonate groups. They are tailored for high electrochromic dynamics (large absorbance change upon reduction) and low extent of pimerization (=charge-transfer (CT) complexation of viologen cation radicals). A new graphical method is presented for the discrimination of simple dilution phenomena and more complex structural effects on the extent of pimerization in the surface-attached viologen layer. |
ISSN: | 0018019X | DOI: | 10.1002/(SICI)1522-2675(20000119)83:1<181::AID-HLCA181>3.0.CO;2-U |
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geprüft am 17.05.2024