The active role of excited states of phenothiazines in photoinduced metal free atom transfer radical polymerization: singlet or triplet excited states?

Steffen Jockusch; Yusuf Yagci

doi:10.1039/C6PY01410K

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The active role of excited states of phenothiazines in photoinduced metal free atom transfer radical polymerization: singlet or triplet excited states?†

Steffen Jockusch*^a and Yusuf Yagci*^b

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* Corresponding authors

^a Department of Chemistry, Columbia University, New York, New York 10027, USA
E-mail: sj67@columbia.edu

^b Istanbul Technical University, Department of Chemistry, Maslak, Istanbul 34469, Turkey
E-mail: yusuf@itu.edu.tr

Abstract

The active role of phenothiazine excited states in photoinduced metal-free atom transfer radical polymerization (ATRP) was investigated by using laser flash photolysis, fluorescence, phosphorescence and electron spin resonance spectroscopy. Weak fluorescence emission and short lifetimes of the singlet excited state (2.01 ns) together with high intersystem crossing quantum yields (∼0.6) and long triplet lifetimes (40 μs) indicate efficient intersystem crossing into the triplet state and its dominant role in a degenerative electron transfer process in photoinduced metal free ATRP.

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Article information

DOI: https://doi.org/10.1039/C6PY01410K
Article type: Communication
Submitted: 12 Aug 2016
Accepted: 05 Sep 2016
First published: 06 Sep 2016

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Polym. Chem., 2016,7, 6039-6043

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The active role of excited states of phenothiazines in photoinduced metal free atom transfer radical polymerization: singlet or triplet excited states?

S. Jockusch and Y. Yagci, Polym. Chem., 2016, 7, 6039 DOI: 10.1039/C6PY01410K

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Polymer Chemistry

The active role of excited states of phenothiazines in photoinduced metal free atom transfer radical polymerization: singlet or triplet excited states?†

Abstract

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The active role of excited states of phenothiazines in photoinduced metal free atom transfer radical polymerization: singlet or triplet excited states?

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