• 제목/요약/키워드: pulse radiolysis

검색결과 2건 처리시간 0.016초

Formation and Properties of Enyne Radical Cation

  • Kim, Bang-Duk;Shim, Sang-Chul;Noboyuki Ichinose;Sachiko Tojo;Tetsuro Majima
    • Journal of Photoscience
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    • 제8권2호
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    • pp.67-69
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    • 2001
  • Radical cations of DPBEY and PPCB were generated by ${\gamma}$-radiolysis and pulse radiolysis in halogenated solvents. The radical cation PPCB+ shows 505 (shoulder) and 520 nm absorption peaks with 700 ns lifetime in agreement with the laser flash photolysis work and strongly support the exciplex mechanism proposed for the photoreaction of PPCB and dimethylfumarate.

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Formation and Cycloreversion of 2-Silacyclobuta[2.3]cyclophances via Photoinduced Electron Transfer

  • Mizuno, Kazuhiko;Nakanishi, Kazuhisa;Otsuji, Yoshio;Hayamizu, Tomoo;Maeda, Hajime;Adachi, Tomohiro;Ishida, Akito;Takamuku, Setsuo
    • Journal of Photoscience
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    • 제10권1호
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    • pp.121-126
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    • 2003
  • Irradiation of an acetonitrile solution containing dimethylbis(4-vinylphenylmethyl)silane 1a in the presence of 9,10-dicyanoanthracene leads to formation of the intramolecular photocycloadduct, 2-sila-cyclobuta[2.3]cyclophane(2a). In contrast, prolonged irradiation gave insoluble polymeric material. The photocycloreversion of 2a occurs efficiently (quantum yields exceeds unity) by use of redox-type photosensitization in the presence of magnesium perchlorate. The transient absorption spectra generated by pulse radiolysis and gamma-radiolysis show that the radical cation species generated from 1a is different from that arising from 2a.

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