• 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 and Characterization of Dinuclear Ruthenium Complexes Covalently Linked to Ru~(II)Tris-bipyridine:An Approach to Mimics of the Donor Side of Photosystem II
【24h】

Synthesis and Characterization of Dinuclear Ruthenium Complexes Covalently Linked to Ru~(II)Tris-bipyridine:An Approach to Mimics of the Donor Side of Photosystem II

机译：与Ru〜（II）Tris-联吡啶共价连接的双核钌配合物的合成与表征：光系统II供体侧的模拟方法

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

To mimic the electron-donor side of photosystem II(PSII),three tri-nuclear ruthenium complexes(2,2a,2b)were synthesized.In these complexes,a mixed-valent dinuclear Ru_2~(II,III)moiety with one phenoxy and two ace-tato bridges is covalently linked to a Ru~(II)tris-bipyridine photosensitizer.The properties and photoinduced electron/energy transfer of these complexes were studied.The results show that the Ru_2~(II,III)moieties in the complexes readily undergo reversible one-electron reduction and one-electron oxidation to give the Ru_2~(II,II)and Ru_2~(III,III)states,respectively.This could allow for photo-oxidation of the sensitizer part with an external acceptor and subsequent electron transfer from the dinuclear ruthenium moiety to regenerate the sensitizer.However,all trinuclear ruthenium complexes have a very short excited-state lifetime,in the range of a few nanoseconds to less than 100ps.Studies by femtosecond time-resolved techniques suggest that a mixture of intramolecular energy and electron transfer between the dinuclear ruthenium moiety and the excited [Ru(bpy)_3]~(2+)photosensitizer is responsible for the short lifetimes.This problem is overcome by anchoring the complexes with ester-or carboxyl-substituted bipyri-dine ligands(2a,2b)to nanocrystalline TiO_2,and the desired electron transfer from the excited state of the [Ru-(bpy)_3]~(2+)moiety to the conduction band of TiO_2 followed by intramolecular electron transfer from the dinuclear Ru_2~(II,III)moiety to photogenerated Ru~(III)was observed.The resulting long-lived Ru_2~(III,III)state decays on the millisecond timescale.
机译：为了模拟光系统II（PSII）的电子给体侧，合成了三种三核钌配合物（2,2a，2b）。在这些配合物中，混合了一个含苯氧基的二价Ru_2〜（II，III）混合部分。并通过两个ace-tato桥与Ru〜（II）tris-Bipyridine光敏剂共价连接。研究了这些配合物的性质和光致电子/能量转移。结果表明，Ru_2〜（II，III）基团配合物容易发生可逆的单电子还原和单电子氧化，分别形成Ru_2〜（II，II）和Ru_2〜（III，III）状态，这可以使增感剂部分与外部受体发生光氧化。飞秒时间分辨技术的研究表明，所有三核钌配合物的激发态寿命都非常短，在几纳秒至不到100ps的范围内。分子内能量的混合物并且双核钌部分与受激发的[Ru（bpy）_3]〜（2+）光敏剂之间的电子转移导致寿命短。通过将配合物与酯或羧基取代的联吡啶二配体锚定可以克服此问题。 （2a，2b）到纳米晶TiO_2，并且所需的电子从[Ru-（bpy）_3]〜（2+）部分的激发态转移到TiO_2的导带，然后从双核Ru_2〜分子内转移电子。观察到（II，III）部分形成光生Ru〜（III）的状态。由此产生的长寿命Ru_2〜（III，III）状态在毫秒级上衰减。

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