Ultrafast Electron Transfer in Supramolecular Mixed Valence Complexes

超分子混合价络合物中的超快电子转移

基本信息

批准号：
1145893
负责人：
Clifford Kubiak
金额：
$ 51.6万
依托单位：
University of California-San Diego
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-07-15 至 2016-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1145893&HistoricalAwards=false
关键词：
Ultrafast Electron Transfer Supramolecular Mixed

项目摘要

This award to Professor Kubiak of the University of California, San Diego funded by the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry focuses on ultrafast chemical reactions; those that occur in one-trillionth of a second (1 picosecond) over large supramolecular structures. These reactions involve the transfer of electrons over reasonably long distances, from 1 to 4 nanometers. The project builds on (1) the observation that exchanging electrons across hydrogen bonds can increase the strength of typically weak interactions; and (2) the observation of mixed valence nanoclusters. The latter are complex molecular structures composed of ruthenium clusters which transfer charge through attached metallic and semiconducting nanoparticles. The research will be extended to more complex systems in order to elucidate how electrons and electron transfer rates respond to different types of pathways through new supramolecular materials. Given the ability to easily manipulate the chemical compositions of these complex systems synthetically, Professor Kubiak and his team are able to custom design these assemblies for a variety of applications. In order to explore these intricate structures, the researchers first aim to stabilize the complexes by increasing the strength of their weak interactions (such as hydrogen bonds) and to then analyze the ultrafast electron transfer properties in these newly stabilized complexes via spectroscopic methods designed for this purpose. The research is relevant to both the scientific and engineering communities in their quest to develop new generations of molecular electronic devices. The future of such devices is dependent on the development of molecular complexes with two or more stable states, which can be switched between these states with extremely fast reaction times.

该奖项授予加州大学圣地亚哥大学的库比亚克教授，由大分子，超分子和纳米化学计划的化学部门授予超快化学反应；那些发生在大型超分子结构上的一千万千万千万千万千万。这些反应涉及电子在相当长的距离上从1纳米转移。该项目以（1）的观察为基础，即在氢键之间交换电子可以增加通常弱相互作用的强度；（2）观察混合价纳米簇。后者是复杂的分子结构，该结构由钌簇组成，这些结构通过附着的金属和半导体纳米颗粒转移电荷。该研究将扩展到更复杂的系统，以阐明电子和电子传输速率如何通过新的超分子材料对不同类型的途径响应。鉴于能够通过合成的这些复杂系统轻松操纵这些复杂系统的化学成分，Kubiak教授及其团队能够为各种应用定制这些组件。为了探索这些复杂的结构，研究人员首先旨在通过增加其弱相互作用的强度（例如氢键）的强度来稳定复合物，然后通过为此目的而设计的光谱方法分析这些新稳定的复合物中的超快电子传递性能。这项研究与科学和工程社区有关，他们寻求开发新一代的分子电子设备。此类设备的未来取决于具有两个或多个稳定状态的分子复合物的发展，这些状态可以在这些状态之间以极快的反应时间进行切换。