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Cheng Yang, Meirou Zhu, Xianling Gong, Aiying Gao, Xinsheng Xu. H-atom Transfer Reaction of Photoinduced Excited Triplet Duroquinone with Tryptophan and Tyrosine in Acetonitrile-Water and Ethylene Glycol-Water Homogeneous Solutions[J]. Chinese Journal of Chemical Physics .
Citation: Cheng Yang, Meirou Zhu, Xianling Gong, Aiying Gao, Xinsheng Xu. H-atom Transfer Reaction of Photoinduced Excited Triplet Duroquinone with Tryptophan and Tyrosine in Acetonitrile-Water and Ethylene Glycol-Water Homogeneous Solutions[J]. Chinese Journal of Chemical Physics .

H-atom Transfer Reaction of Photoinduced Excited Triplet Duroquinone with Tryptophan and Tyrosine in Acetonitrile-Water and Ethylene Glycol-Water Homogeneous Solutions

  • Received Date: 2020-09-28
  • Accepted Date: 2021-01-14
  • Rev Recd Date: 2020-12-07
  • Available Online: 2021-01-27
  • Laser flash photolysis was used to investigate the photoinduced reactions of excited triplet of bioquinone molecule duroquinone (DQ) with tryptophan (Trp) and tyrosine (Tyr) in Acetonitrile-Water (MeCN-H2O) and Ethylene Glycol-Water (EG-H2O) solutions. The reaction mechanisms were analyzed and the reaction rate constants were measured based on Stern-Volmer equation. The H-atom transfer reaction from Trp (Tyr) to 3DQ* is dominant after the formation of 3DQ* during the laser photolysis. For DQ and Trp in MeCN-H2O and EG-H2O solutions, 3DQ* captures H-atom from Trp to generate duroquinone neutral radical DQH•, carbon-centered tryptophan neutral radical Trp•/NH and nitrogen-centered tryptophan neutral radical Trp/N•. For DQ and Tyr in MeCN-H2O and EG-H2O solutions, 3DQ* captures H-atom from Tyr to generate duroquinone neutral radical DQH• and tyrosine neutral radical Tyr/O•. The H-atom transfer reaction rate constants of 3DQ* with Trp (Tyr) are on the level of 109 L•mol-1•s-1, nearly controlled by diffusion. The reaction rate constants of 3DQ* with Trp (Tyr) in MeCN/H2O solution is larger than that in EG/H2O solution, which agree with Stokes–Einstein relationship qualitatively
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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H-atom Transfer Reaction of Photoinduced Excited Triplet Duroquinone with Tryptophan and Tyrosine in Acetonitrile-Water and Ethylene Glycol-Water Homogeneous Solutions

Abstract: Laser flash photolysis was used to investigate the photoinduced reactions of excited triplet of bioquinone molecule duroquinone (DQ) with tryptophan (Trp) and tyrosine (Tyr) in Acetonitrile-Water (MeCN-H2O) and Ethylene Glycol-Water (EG-H2O) solutions. The reaction mechanisms were analyzed and the reaction rate constants were measured based on Stern-Volmer equation. The H-atom transfer reaction from Trp (Tyr) to 3DQ* is dominant after the formation of 3DQ* during the laser photolysis. For DQ and Trp in MeCN-H2O and EG-H2O solutions, 3DQ* captures H-atom from Trp to generate duroquinone neutral radical DQH•, carbon-centered tryptophan neutral radical Trp•/NH and nitrogen-centered tryptophan neutral radical Trp/N•. For DQ and Tyr in MeCN-H2O and EG-H2O solutions, 3DQ* captures H-atom from Tyr to generate duroquinone neutral radical DQH• and tyrosine neutral radical Tyr/O•. The H-atom transfer reaction rate constants of 3DQ* with Trp (Tyr) are on the level of 109 L•mol-1•s-1, nearly controlled by diffusion. The reaction rate constants of 3DQ* with Trp (Tyr) in MeCN/H2O solution is larger than that in EG/H2O solution, which agree with Stokes–Einstein relationship qualitatively

Cheng Yang, Meirou Zhu, Xianling Gong, Aiying Gao, Xinsheng Xu. H-atom Transfer Reaction of Photoinduced Excited Triplet Duroquinone with Tryptophan and Tyrosine in Acetonitrile-Water and Ethylene Glycol-Water Homogeneous Solutions[J]. Chinese Journal of Chemical Physics .
Citation: Cheng Yang, Meirou Zhu, Xianling Gong, Aiying Gao, Xinsheng Xu. H-atom Transfer Reaction of Photoinduced Excited Triplet Duroquinone with Tryptophan and Tyrosine in Acetonitrile-Water and Ethylene Glycol-Water Homogeneous Solutions[J]. Chinese Journal of Chemical Physics .

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