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songqiu yang, Yan Zhang, Yanni Wang. Photochemistry of potassium ferrocyanide and its reaction with uridine 5'-monophosphate in an aqueous solution under ultraviolet irradiation[J]. Chinese Journal of Chemical Physics .
Citation: songqiu yang, Yan Zhang, Yanni Wang. Photochemistry of potassium ferrocyanide and its reaction with uridine 5'-monophosphate in an aqueous solution under ultraviolet irradiation[J]. Chinese Journal of Chemical Physics .

Photochemistry of potassium ferrocyanide and its reaction with uridine 5'-monophosphate in an aqueous solution under ultraviolet irradiation

  • Received Date: 2021-01-22
  • Accepted Date: 2021-02-04
  • Rev Recd Date: 2021-02-03
  • Available Online: 2021-02-25
  • The photochemical reaction of potassium ferrocyanide (K4Fe(CN)6}) exhibits excitation wavelength dependence and non-Kasha rule behavior. In this study, the excited-state dynamics of K4Fe(CN)6 were studied by transient absorption spectroscopy. Excited state electron detachment (ESED) and phtoaquation reactions were clarified by comparing the results of 260 , 320 , 340 , and 350 nm excitations. ESED is the path to generate a hydrated electron (eaq-). ESED energy barrier varies with the excited state, and it occurrs even at the first singlet excited state (1T1g). The 1T1g state shows ~0.2 ps lifetime and converts into triplet [Fe(CN)6]4- by intersystem crossing. Subsequently, 3[Fe(CN)5]3- appears after one CN- ligand is ejected. In sequence, H2O attacks [Fe(CN)5]3- to generate [Fe(CN)5H2O]3- with a time constant of approximately 20 ps. The 1T1g state and eaq- exhibit strong reducing power. The addition of UMP to the K4Fe(CN)6 solution decreased the yield of eaq- and reduced the lifetimes of the eaq- and 1T1g state. The obtained reaction rate constant of 1T1g state and UMP was 1.7×1014 M-1 s-1, and the eaq- attachment to UMP was ~8×109 M-1 s-1. Our results indicate that the reductive damage of K4Fe(CN)6 solution to nucleic acids under ultraviolet irradiation cannot be neglected.
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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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Photochemistry of potassium ferrocyanide and its reaction with uridine 5'-monophosphate in an aqueous solution under ultraviolet irradiation

Abstract: The photochemical reaction of potassium ferrocyanide (K4Fe(CN)6}) exhibits excitation wavelength dependence and non-Kasha rule behavior. In this study, the excited-state dynamics of K4Fe(CN)6 were studied by transient absorption spectroscopy. Excited state electron detachment (ESED) and phtoaquation reactions were clarified by comparing the results of 260 , 320 , 340 , and 350 nm excitations. ESED is the path to generate a hydrated electron (eaq-). ESED energy barrier varies with the excited state, and it occurrs even at the first singlet excited state (1T1g). The 1T1g state shows ~0.2 ps lifetime and converts into triplet [Fe(CN)6]4- by intersystem crossing. Subsequently, 3[Fe(CN)5]3- appears after one CN- ligand is ejected. In sequence, H2O attacks [Fe(CN)5]3- to generate [Fe(CN)5H2O]3- with a time constant of approximately 20 ps. The 1T1g state and eaq- exhibit strong reducing power. The addition of UMP to the K4Fe(CN)6 solution decreased the yield of eaq- and reduced the lifetimes of the eaq- and 1T1g state. The obtained reaction rate constant of 1T1g state and UMP was 1.7×1014 M-1 s-1, and the eaq- attachment to UMP was ~8×109 M-1 s-1. Our results indicate that the reductive damage of K4Fe(CN)6 solution to nucleic acids under ultraviolet irradiation cannot be neglected.

songqiu yang, Yan Zhang, Yanni Wang. Photochemistry of potassium ferrocyanide and its reaction with uridine 5'-monophosphate in an aqueous solution under ultraviolet irradiation[J]. Chinese Journal of Chemical Physics .
Citation: songqiu yang, Yan Zhang, Yanni Wang. Photochemistry of potassium ferrocyanide and its reaction with uridine 5'-monophosphate in an aqueous solution under ultraviolet irradiation[J]. Chinese Journal of Chemical Physics .

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