• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Synthesis, Characterization, Redox Properties, and Photodynamics of Donor–Acceptor Nanohybrids Composed of Size-Controlled Cup-Shaped Nanocarbons and Porphyrins
【24h】

Synthesis, Characterization, Redox Properties, and Photodynamics of Donor–Acceptor Nanohybrids Composed of Size-Controlled Cup-Shaped Nanocarbons and Porphyrins

机译：尺寸控制的杯状纳米碳和卟啉组成的供体-受体纳米杂化物的合成，表征，氧化还原性质和光动力学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Cup-shaped nanocarbons (CNC) generated by the electron-transfer reduction of cup-stacked carbon nanotubes have been functionalized with porphyrins (H2P) as light-capturing chromophores. The resulting donor–acceptor nanohybrid has been characterized by thermogravimetric analysis (TGA), Raman and IR spectroscopy, transmission electron icroscopy, elemental analysis, and UV/Vis spectroscopy. The weight of the porphyrins attached to the cup-shaped nanocarbons was determined as 20% by TGA and elemental analysis. The UV/Vis absorption spectrum of CNC ACHTUNGTRENUNG(H2P)n in DMF agrees well with that obtained by the superposition of reference porphyrin (ref-H2P) and cupshaped nanocarbons. The photoexcitation of the CNCACHTUNGTRENUNG(H2P)n anohybrid results in formation of the charge-separated (CS) state to attain the longest CS lifetime (0.640.01 ms) ever reported for donor–acceptor nanohybrids, which may arise from efficient electron migration following the charge separation. The formation of a radical ion pair was detected directly by electron spin resonance (ESR) measurements under photoirradiation of CNC ACHTUNGTRENUNG(H2P)n with a high-pressure mercury lamp in frozen DMF at 153 K. The observed ESR signal at g=2.0044 agrees with that of ref-H2PC+ produced by one-electron oxidation with [Ru- ACHTUNGTRENUNG(bpy)3]3+ in deaerated CHCl3, ndicating the formation of H2PC+. The electron- acceptor ability of the reference CNC compound (ref-CNC) was also examined by the electron-transfer reduction of ref-CNC by a series of semiquinone radical anions.
机译：通过杯状堆积的碳纳米管的电子转移还原而生成的杯状纳米碳（CNC）已被卟啉（H2P）用作光捕获发色团。通过热重分析（TGA），拉曼光谱和红外光谱，透射电子散射，元素分析和紫外/可见光谱对得到的供体-受体纳米杂化物进行了表征。通过TGA和元素分析将附着在杯状纳米碳上的卟啉的重量确定为20％。 CNC ACHTUNGTRENUNG（H2P）n在DMF中的UV / Vis吸收光谱与参考卟啉（ref-H2P）和杯状纳米碳的叠加所获得的光谱非常吻合。 CNCACHTUNGTRENUNG（H2P）n杂化物的光激发导致形成电荷分离（CS）状态，以达到有史以来报道的供体-受体纳米杂化体最长的CS寿命（0.640.01 ms），这可能是由于有效的电子迁移引起的电荷分离。自由基离子对的形成是通过在153 K冷冻DMF中用高压汞灯在CNC ACHTUNGTRENUNG（H2P）n光辐照下通过电子自旋共振（ESR）测量直接检测到的。在g = 2.0044处观察到的ESR信号一致与在脱气的CHCl3中用[Ru- ACHTUNGTRENUNG（bpy）3] 3+单电子氧化制得的ref-H2PC +相同，表明H2PC +的形成。还通过一系列半醌自由基阴离子对ref-CNC的电子转移还原，还检测了参比CNC化合物（ref-CNC）的电子受体能力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号