Journal article 284 views
Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
The Journal of Physical Chemistry B, Volume: 114, Issue: 39, Pages: 12439 - 12447
Swansea University Author:
Catherine De Castro
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DOI (Published version): 10.1021/jp1020214
Abstract
A commercial poly(acrylic acid) (PAA, Mn = 450 000 g mol−1) has been labeled with high levels (9.1 mol %) of pyrene by reaction with 1-pyrenylmethylamine in the presence of boric acid. The modified polymer was found to display an unusual photophysical behavior closely resembling that found for pyren...
| Published in: | The Journal of Physical Chemistry B |
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| ISSN: | 1520-6106 1520-5207 |
| Published: |
2010
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31933 |
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| Abstract: |
A commercial poly(acrylic acid) (PAA, Mn = 450 000 g mol−1) has been labeled with high levels (9.1 mol %) of pyrene by reaction with 1-pyrenylmethylamine in the presence of boric acid. The modified polymer was found to display an unusual photophysical behavior closely resembling that found for pyrene in constrained environments. The appearance of a band at longer wavelengths in the excitation spectra when collected at the long wavelength emission band was attributed to the spectra of a dimer. The emission of this dimer was particularly enhanced in dioxane:water solvent mixtures with low dioxane content. From time-resolved fluorescence measurements in the picosecond time domain, two decay components were obtained: a fast decay (4−10 ps) at short wavelengths, which becomes a rising component at longer wavelengths, and a second exponential (2−4 ns) related to the emission of the relaxed dimer. Time-resolved emission spectra were seen to change with time, revealing the emission contribution of two species. This is one of the first reports where the dynamics of dimer formation in a pyrene derivative have been observed. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
39 |
| Start Page: |
12439 |
| End Page: |
12447 |