• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Preparation and photophysical and photoelectrochemical properties of a covalently fixed porphyrin-chemically converted graphene composite
【24h】

Preparation and photophysical and photoelectrochemical properties of a covalently fixed porphyrin-chemically converted graphene composite

机译：共价固定卟啉-化学转化石墨烯复合材料的制备及其光物理和光电化学性质

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

Chemically converted graphene (CCG) covalently linked with porphyrins has been prepared by a Suzuki coupling reaction between iodophenyl-functionalized CCG and porphyrin boronic ester. The covalently linked CCG-porphyrin composite was designed to possess a short, rigid phenylene spacer between the porphyrin and the CCG. The composite material formed stable dispersions in DMF and the structure was characterized by spectroscopic, thermal, and microscopic measurements. In steady-state photoluminescence spectra, the emission from the porphyrin linked to the CCG was quenched strongly relative to that of the porphyrin reference. Fluorescence lifetime and femtosecond transient absorption measurements of the porphyrin-linked CCG revealed a short-lived porphyrin singlet excited state (38 ps) without yielding the porphyrin radical cation, thereby substantiating the occurrence of energy transfer from the porphyrin excited state to the CCG and subsequent rapid decay of the CCG excited state to the ground state. Consistently, the photocurrent action spectrum of a photoelectrochemical device with a SnO _2 electrode coated with the porphyrin-linked CCG exhibited no photocurrent response from the porphyrin absorption. The results obtained here provide deep insight into the interaction between graphenes and π-conjugated systems in the excited and ground states.
机译：已通过碘苯基官能化CCG与卟啉硼酸酯之间的Suzuki偶联反应制备了与卟啉共价连接的化学转化石墨烯（CCG）。共价连接的CCG-卟啉复合物被设计为在卟啉和CCG之间具有一个短的刚性亚苯基间隔基。该复合材料在DMF中形成稳定的分散体，并通过光谱，热学和显微镜测量对结构进行了表征。在稳态光致发光光谱中，相对于卟啉参比，与CCG连接的卟啉的发射被强烈淬灭。卟啉连接的CCG的荧光寿命和飞秒瞬态吸收测量显示，卟啉单重态激发态很短（38 ps），而没有产生卟啉自由基阳离子，从而证实了从卟啉激发态到CCG以及随后的能量转移的发生。 CCG激发态迅速衰减到基态。一致地，具有涂覆有卟啉连接的CCG的SnO _2电极的光电化学装置的光电流作用谱没有显示出来自卟啉吸收的光电流响应。此处获得的结果为深入了解石墨烯与π共轭体系在激发态和基态之间的相互作用提供了深刻的见识。

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