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

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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.

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Acknowledgements

This work is supported in part by the Scientific Research Starting Foundation for teachers with Ph.D. in Anhui Normal University. We are grateful to Professor Limin Zhang for his help in transient absorptive spectrum measurement.

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Authors and Affiliations

  1. Institute of Atomic and Molecular Physics, Anhui Normal University, 241000, Wuhu, People’s Republic of China

    Xinsheng Xu, Lixia Jia, Lei Shi & Zhifeng Cui

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  1. Xinsheng Xu
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  2. Lixia Jia
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  3. Lei Shi
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  4. Zhifeng Cui
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Correspondence to Xinsheng Xu.

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Xu, X., Jia, L., Shi, L. et al. Quenching dynamics study on photoinduced excited triplet duroquinone by TEMPO in 1,2-propandiol. Res Chem Intermed 36, 259–267 (2010). https://doi.org/10.1007/s11164-010-0138-1

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  • DOI: https://doi.org/10.1007/s11164-010-0138-1

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