Generation and Electron-Transfer Reactivity of the Long-Lived Photoexcited State of a Manganese(IV)-Oxo-Scandium Nitrate Complex

Namita Sharma, Yong Min Lee, Wonwoo Nam, Shunichi Fukuzumi

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Photoexcitation of a manganese(IV)-oxo-scandium nitrate complex ([(Bn-TPEN)MnIV(O)]2+−Sc(NO3)3) in a solvent mixture of trifluoroethanol and acetonitrile (v/v=1 : 1) resulted in generation of the long-lived photoexcited state, which is detected by nanosecond laser transient absorption measurements. The transient absorption maximum (λmax) of the 2E excited state of [(Bn-TPEN)MnIV(O)]2+−Sc(NO3)3 is observed at 620 nm with lifetimes of 7.1 μs. The λmax value is blue-shifted and the lifetime becomes longer as compared with the previously reported values of λmax (640 nm) and lifetime (6.4 μs) of the 2E excited state of the 1 : 2 complex between [(Bn-TPEN)MnIV(O)]2+ and Sc(OTf)3 ([(Bn-TPEN)MnIV(O)]2+−(Sc(OTf)3)2). The electron-transfer reactivity of the 2E excited states of [(Bn-TPEN)MnIV(O)]2+−Sc(NO3)3 was similar to that of [(Bn-TPEN)MnIV(O)]2+−(Sc(OTf)3)2. The long lifetime and the high reactivity of the 2E excited state of [(Bn-TPEN)MnIV(O)]2+−Sc(NO3)3 provide an excellent photooxidant for oxidation of compounds, which would otherwise be impossible to be oxidized.

Original languageEnglish
Pages (from-to)1049-1056
Number of pages8
JournalIsrael Journal of Chemistry
Volume60
Issue number10-11
DOIs
StatePublished - 1 Oct 2020

Keywords

  • electron transfer
  • manganese(IV)-oxo complex
  • photoexcited state
  • scandium ion

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