Quenching dynamics study on photoinduced excited triplet duroquinone by TEMPO in 1,2-propandiol

Quenching dynamics study on photoinduced excited triplet duroquinone by TEMPO in 1,2-propandiol Chemically induced dynamic electron polarization (CIDEP) spectrum and transient absorptive spectrum are recorded in photolysis of duroquinone (DQ) in 1,2-propanodiol (PG). Durosemiquinone neutral radical DQH• and PG ketyl radical $${\text{CH}}_{3}{{{\dot{\text{C}}}\text{OHCH}}}_{2}{\text{OH}}$$ are produced through hydrogen transfer reaction from PG to 3DQ*. When stable radical TEMPO is added to DQ/PG solution, photolysis results in CIDEP on TEMPO, which can be interpreted as a quartet precursor radical-triplet pair mechanism (QP-RTPM). There is competition between PG and TEMPO to quench 3DQ*. The CIDEP intensity of DQH• decreases with the increase of TEMPO concentration. The quenching dynamics in photolysis of DQ/TEMPO/PG system is analyzed in detail. Based on the dynamics analysis and the measurement of the lifetime of 3DQ* by its transient absorbance decay, the quenching rate constant of 3DQ* by TEMPO in PG is obtained as 1.34 × 107 L mol−1 s−1. This quenching rate constant is closely diffusion-controlled. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Quenching dynamics study on photoinduced excited triplet duroquinone by TEMPO in 1,2-propandiol

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Publisher
Springer Netherlands
Copyright
Copyright © 2010 by Springer Science+Business Media B.V.
Subject
Chemistry; Inorganic Chemistry ; Physical Chemistry ; Catalysis
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-010-0138-1
Publisher site
See Article on Publisher Site

Abstract

Chemically induced dynamic electron polarization (CIDEP) spectrum and transient absorptive spectrum are recorded in photolysis of duroquinone (DQ) in 1,2-propanodiol (PG). Durosemiquinone neutral radical DQH• and PG ketyl radical $${\text{CH}}_{3}{{{\dot{\text{C}}}\text{OHCH}}}_{2}{\text{OH}}$$ are produced through hydrogen transfer reaction from PG to 3DQ*. When stable radical TEMPO is added to DQ/PG solution, photolysis results in CIDEP on TEMPO, which can be interpreted as a quartet precursor radical-triplet pair mechanism (QP-RTPM). There is competition between PG and TEMPO to quench 3DQ*. The CIDEP intensity of DQH• decreases with the increase of TEMPO concentration. The quenching dynamics in photolysis of DQ/TEMPO/PG system is analyzed in detail. Based on the dynamics analysis and the measurement of the lifetime of 3DQ* by its transient absorbance decay, the quenching rate constant of 3DQ* by TEMPO in PG is obtained as 1.34 × 107 L mol−1 s−1. This quenching rate constant is closely diffusion-controlled.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Mar 11, 2010

References

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