Pulse radiolyses of anthraquinone and anthraquinone-triethylamine in acetonitrile and toluene at room temperature

Toshihiro Nakayama, Kiminori Ushida, Kumao Hamanoue, Masakazu Washio, Seiichi Tagawa, Yoneho Tabata

Research output: Contribution to journalArticle

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Abstract

Nanosecond pulse radiolysis of anthraquinone (AQ) in several solvents has been performed at room temperature, and the following results are obtained: (1) In acetonitrile (CH3CN), the formation of triplet AQ and a free-radical anion (AQ.-) of AQ is observed. The former is produced by energy transfer from an excited neutral of CH3CN which may be produced via the geminate recombination of a radical cation and a radical anion of CH3CN in a spur, while the latter is produced by electron transfer from anionic species such as a solvated electron, a monomeric and/or a dimeric radical anion of CH3CN. In CH3CN-triethylamine (TEA), both free AQ.- and triplet AQ mentioned above are also produced; however, the latter reacts with TEA, giving rise to the formation of free AQ.- (from the second triplet state of AQ) and an exciplex of the lowest triplet state of AQ with ground-state TEA. This exciplex decomposes to free AQ.- and the radical cation of TEA. (2) In toluene, only triplet AQ is produced by energy transfer from triplet toluene to AQ, and, in the presence of TEA, the formation of the triplet exciplex of AQ-TEA is observed. On a microsecond timescale, however, this exciplex changes to a contact ion pair followed by proton transfer, generating anthrasemiquinone radical and triethylamine radical in accordance with the result of photolysis.

Original languageEnglish
Pages (from-to)95-103
Number of pages9
JournalJournal of the Chemical Society, Faraday Transactions
Volume86
Issue number1
DOIs
Publication statusPublished - 1990
Externally publishedYes

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Anthraquinones
Radiolysis
anthraquinones
Toluene
radiolysis
acetonitrile
toluene
room temperature
pulses
Temperature
Anions
anions
triethylamine
Energy transfer
atomic energy levels
Cations
energy transfer
cations
Proton transfer
Electrons

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Pulse radiolyses of anthraquinone and anthraquinone-triethylamine in acetonitrile and toluene at room temperature. / Nakayama, Toshihiro; Ushida, Kiminori; Hamanoue, Kumao; Washio, Masakazu; Tagawa, Seiichi; Tabata, Yoneho.

In: Journal of the Chemical Society, Faraday Transactions, Vol. 86, No. 1, 1990, p. 95-103.

Research output: Contribution to journalArticle

Nakayama, Toshihiro ; Ushida, Kiminori ; Hamanoue, Kumao ; Washio, Masakazu ; Tagawa, Seiichi ; Tabata, Yoneho. / Pulse radiolyses of anthraquinone and anthraquinone-triethylamine in acetonitrile and toluene at room temperature. In: Journal of the Chemical Society, Faraday Transactions. 1990 ; Vol. 86, No. 1. pp. 95-103.
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