The oxidation state of 'emeraldine' base
| Autor: | Alan G. MacDiarmid, R. P. McCall, A. J. Epstein, G.E. Asturias |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Base (chemistry) Mechanical Engineering Inorganic chemistry Metals and Alloys Infrared spectroscopy Condensed Matter Physics Electronic Optical and Magnetic Materials Ion Acetic acid chemistry.chemical_compound chemistry Mechanics of Materials Oxidation state Materials Chemistry Absorption (chemistry) Inert gas |
| Zdroj: | Synthetic Metals. 29:157-162 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/0379-6779(89)90291-9 |
| Popis: | “Emeraldine” base prepared in air has an oxidation state as defined in the text of (1−y)∼0.6. whereas when prepared under an inert atmosphere, (1ȳ)∼0.4. The electronic spectrum of freshly prepared “emeraldine” base solutions in aqueous 80% acetic acid depends on the oxidation state: an absorption at λmax∼670 nm (1.85 eV) is observed for the blue solutions of “emeraldine” base having (1−y)∼0.6, whereas the same absorption is shifted to λmax∼760 nm (1.63 eV) for the green solutions of “emeraldine” base having (1−y)∼0.4. The blue solutions become green after ∼0.5 hours. On standing, the absorpt ion peaks of both solutions shift to an identical equilibrium value of λmax=787 nm (1.58 eV). These observations can be used as a convenient color “spot-test” to gain information concerning the oxidation state of “emeraldine” base. The infrared spectra of the solid samples are consistent with the above (1−y) values. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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