Separating Solvent and Conformational Effects on the Photophysics of a Homologous Progression of N-Terminated Phenylenevinylene Oligomers
| Autor: | Hugh D. Burrows, Licínia L. G. Justino, António L. Maçanita, Alexander W. Thomas, Guillermo C. Bazan, João A. S. Almeida, Roberto E. Di Paolo, Telma Costa, Logan E. Garner |
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| Rok vydání: | 2013 |
| Předmět: |
Photoluminescence
Absorption spectroscopy Solvatochromism Photochemistry Fluorescence Toluene Surfaces Coatings and Films Electronic Optical and Magnetic Materials Solvent Homologous series chemistry.chemical_compound General Energy chemistry Physical and Theoretical Chemistry Absorption (chemistry) |
| Zdroj: | The Journal of Physical Chemistry C. 117:18353-18366 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp406048g |
| Popis: | A homologous series of p-phenylenevinylene oligomers (PPV)n (n = 3–5) with terminal dialkylamino groups have been synthesized, and characterized. The photophysical and solvatochromic properties of oligomers with three, four, and five phenyl groups were investigated in solution through steady-state and time-resolved fluorescence. The red-shift seen in absorption and photoluminescence (PL) spectra on increasing chain length is consistent with an extension of the conjugation length. Decreasing solvent polarity leads to small shifts of the absorption spectra and large blue-shifts of the PL spectra. Time-resolved emission on these oligomers allows separation of conformational and solvent contributions to their photophysical behavior. Global analysis of fluorescence decays collected at different emission wavelengths shows biexponential behavior in toluene at room temperature. The longer time appears as a decay component at all emission wavelengths and decreases from 949 to 850 ps with increasing chain length. T... |
| Databáze: | OpenAIRE |
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