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Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer

T. Costa, J. Sérgio Seixas De Melo, C.S. Castro, S. Gago, M. Pillinger, I.S. Gonçalves, Catherine De Castro Orcid Logo

The Journal of Physical Chemistry B, Volume: 114, Issue: 39, Pages: 12439 - 12447

Swansea University Author: Catherine De Castro Orcid Logo

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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...

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Published in: The Journal of Physical Chemistry B
ISSN: 1520-6106 1520-5207
Published: 2010
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URI: https://cronfa.swan.ac.uk/Record/cronfa31933
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spelling 2017-04-07T12:00:00.0992499 v2 31933 2017-02-10 Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer 9523c09d78056932bb9b6959b559323e 0000-0003-0649-3427 Catherine De Castro Catherine De Castro true false 2017-02-10 EEN 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. Journal Article The Journal of Physical Chemistry B 114 39 12439 12447 1520-6106 1520-5207 31 12 2010 2010-12-31 10.1021/jp1020214 http://www.scopus.com/inward/record.url?eid=2-s2.0-77957319319&amp;partnerID=MN8TOARS COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2017-04-07T12:00:00.0992499 2017-02-10T15:25:01.5744687 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised T. Costa 1 J. Sérgio Seixas De Melo 2 C.S. Castro 3 S. Gago 4 M. Pillinger 5 I.S. Gonçalves 6 Catherine De Castro 0000-0003-0649-3427 7
title Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
spellingShingle Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
Catherine De Castro
title_short Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
title_full Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
title_fullStr Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
title_full_unstemmed Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
title_sort Picosecond Dynamics of Dimer Formation in a Pyrene Labeled Polymer
author_id_str_mv 9523c09d78056932bb9b6959b559323e
author_id_fullname_str_mv 9523c09d78056932bb9b6959b559323e_***_Catherine De Castro
author Catherine De Castro
author2 T. Costa
J. Sérgio Seixas De Melo
C.S. Castro
S. Gago
M. Pillinger
I.S. Gonçalves
Catherine De Castro
format Journal article
container_title The Journal of Physical Chemistry B
container_volume 114
container_issue 39
container_start_page 12439
publishDate 2010
institution Swansea University
issn 1520-6106
1520-5207
doi_str_mv 10.1021/jp1020214
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
url http://www.scopus.com/inward/record.url?eid=2-s2.0-77957319319&amp;partnerID=MN8TOARS
document_store_str 0
active_str 0
description 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.
published_date 2010-12-31T03:39:04Z
_version_ 1763751749630296064
score 11.035743

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