Ionochromic Effects and Structures of Metalated Poly(p-phenylenevinylene) Polymers Incorporating 2,2‘-Bipyridines
| Autor: | Michael R. Wasielewski, Wighard J. H. Jäger, Lin X. Chen, Mark P. Niemczyk, David J. Gosztola |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Photoluminescence Chemistry Exciton Polymer Electronic structure Conjugated system Photochemistry Surfaces Coatings and Films Ion Metal chemistry.chemical_compound Monomer visual_art Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry B. 104:1950-1960 |
| ISSN: | 1520-5207 1520-6106 |
| Popis: | The effects of metal ion chelation to the 2,2‘-bipyridine (bpy) groups on the photophysics and exciton dynamics of two conjugated polymers 1 and 2 in solution are investigated. The structures of polymers 1 and 2 have 2,2‘-bipyridyl-5-vinylene units that alternate with one and three 2,5-bis(n-decyloxy)-1,4-phenylenevinylene monomer units, respectively. The photophysics and exciton dynamics of metalated polymers 1 and 2 are compared to those of the metal-free polymers (Chen et al. J. Phys. Chem. A 1999, 103, 4341−4351). The origins of ionochromic effects due the metal ion chelation were studied using both steady-state and transient optical spectroscopy, and the results indicate that both conformational flattening and participation of π electrons from the metal in the π-conjugation of the polymer backbone play important roles in metal ion binding induced red shifts in absorption and photoluminescence spectra. The photoluminescence properties of the metalated polymers are determined by the metal ion electroni... |
| Databáze: | OpenAIRE |
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