Photodissociation of pyrene dimer radical cation during the pulse radiolysis–laser flash photolysis combined method

Photodissociation of pyrene dimer radical cation during the pulse radiolysis–laser flash... Photodissociation of pyrene (Py) dimer radical cation (Py 2 ∙+ ) giving pyrene radical cation (Py∙+) and Py and subsequent regeneration of Py 2 ∙+ by association of Py∙+ and Py were directly observed during the pulse radiolysis–laser flash photolysis combined method at room temperature. When Py 2 ∙+ was excited at the local excitation band with the 532-nm laser flash, the rapid growth and decay of monomeric Py∙+ were observed at 460 nm. The dissociation of Py 2 ∙+ proceeded via a one-photon process to give the ground-state Py∙+(D0) and Py in the quantum yield (Φdiss) of (2.9 ± 0.9) × 10−3. It was shown that Py∙+ decayed with a time constant of several tens of nanoseconds, indicating that the association of Py∙+ with Py regenerating Py 2 ∙+ proceeds at a diffusion-controlled rate. The photodissociation proceeded from the lowest excited state of Py 2 ∙+ , even when Py 2 ∙+ was excited to the higher excited state. The difference between the Φdiss value of Py 2 ∙+ and that previously reported for naphthalene dimer radical cation (Np 2 ∙+ ) is discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Photodissociation of pyrene dimer radical cation during the pulse radiolysis–laser flash photolysis combined method

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Publisher
Springer Journals
Copyright
Copyright © 2012 by Springer Science+Business Media B.V.
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-012-0662-2
Publisher site
See Article on Publisher Site

Abstract

Photodissociation of pyrene (Py) dimer radical cation (Py 2 ∙+ ) giving pyrene radical cation (Py∙+) and Py and subsequent regeneration of Py 2 ∙+ by association of Py∙+ and Py were directly observed during the pulse radiolysis–laser flash photolysis combined method at room temperature. When Py 2 ∙+ was excited at the local excitation band with the 532-nm laser flash, the rapid growth and decay of monomeric Py∙+ were observed at 460 nm. The dissociation of Py 2 ∙+ proceeded via a one-photon process to give the ground-state Py∙+(D0) and Py in the quantum yield (Φdiss) of (2.9 ± 0.9) × 10−3. It was shown that Py∙+ decayed with a time constant of several tens of nanoseconds, indicating that the association of Py∙+ with Py regenerating Py 2 ∙+ proceeds at a diffusion-controlled rate. The photodissociation proceeded from the lowest excited state of Py 2 ∙+ , even when Py 2 ∙+ was excited to the higher excited state. The difference between the Φdiss value of Py 2 ∙+ and that previously reported for naphthalene dimer radical cation (Np 2 ∙+ ) is discussed.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jun 22, 2012

References

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