Photoinduced charge separation of phenothiazine–platinum–naphthalene diimide triads linked by twisted phenylene bridges

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• 作者：Ryoji Sugimura (1)
  Shuichi Suzuki (1)
  Masatoshi Kozaki (1)
  Kazutoshi Keyaki (2)
  Koichi Nozaki (2)
  Hironori Matsushita (3)
  Noriaki Ikeda (3)
  Keiji Okada (1)
  
• 关键词：Photoinduced electron transfer ; Phenothiazine ; Naphthalene diimide ; Platinum complex
• 刊名：Research on Chemical Intermediates
• 出版年：2013
• 出版时间：January 2013
• 年：2013
• 卷：39
• 期：1
• 页码：185-204
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• 作者单位：Ryoji Sugimura (1)
  Shuichi Suzuki (1)
  Masatoshi Kozaki (1)
  Kazutoshi Keyaki (2)
  Koichi Nozaki (2)
  Hironori Matsushita (3)
  Noriaki Ikeda (3)
  Keiji Okada (1)
  
  1. Department of Chemistry, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka, 558-8585, Japan
  2. Department of Chemistry, Graduate School of Science and Engineering, University of Toyama, Gofuku, Toyama, 930-8555, Japan
  3. Department of Macromolecular Science and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology, Sakyo-ku, Kyoto, 606-8585, Japan
  
• ISSN：1568-5675

文摘

Two triads (i.e., 3PTZ–Pt–MNDI and 10PTZ–Pt–MNDI) consisting of 3-phenothiazine (3PTZ) or 10-phenothiazine (10PTZ), bipyridine–diacetylide platinum complex (Pt), and naphthalene diimide (MNDI) chromophores linked by highly twisted biphenylene spacers have been prepared. The formation and decay of the charge-separated (CS) states in toluene were studied by use of picosecond and nanosecond laser photolysis via selective excitation of the Pt moiety. The time required for formation of the CS state, PTZ+–Pt–MNDI?/sup>, from PTZ-sup class="a-plus-plus">3Pt*–MNDI was determined to be τ CS?=?280?ps for 3PTZ+–Pt–MNDI?/sup> and τ CS?=?230?ps for 10PTZ+–Pt–MNDI?/sup>. The lifetimes of the CS states were determined to be τ CR1?=?75?ns (95?%) and τ CR2?=?285?ns (5?%) for 3PTZ+–Pt–MNDI?/sup> and τ CR?=?830?ns for 10PTZ+–Pt–MNDI?/sup>. Formation and decay of the CS states are discussed in terms the Marcus theory and the spin-correlated radical pair mechanism.