Probing the Electronic Structures of Transition Metal Clusters and Solution Anions Using Photoelectron Spectroscopy and Photoelectron Imaging

利用光电子能谱和光电子成像探测过渡金属簇和溶液阴离子的电子结构

• 批准号: 1049717
• 负责人: Lai-Sheng Wang
• 金额: $ 35万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1049717&HistoricalAwards=false
• 关键词: Probing; Electronic; Structures; Transition; Metal

In this project funded by the Chemical Structure, Dynamics and Mechanisms Program of the Division of Chemistry, Professor Lai-Sheng Wang of Brown University, together with his graduate and undergraduate student researchers, will study the structures of large gold clusters and how properties of gold clusters can be modified by dopant atoms. These clusters will be produced by laser vaporization and will be investigated through a combination of mass spectrometry and photoelectron spectroscopy aided by theoretical calculations. The ultimate goal of this research is to understanding the mechanisms of new catalytic properties discovered for gold nanoparticles. Toward this end, the Wang group will also study CO and O2 adsorbed on gold clusters, which will contribute to a molecular-level understanding of CO oxidation by gold nanoparticles.Another research direction pursued under the support of this program is to study solution phase molecules in the gas phase using electrospray ionization and photoelectron spectroscopy, a unique experimental technique developed in the Wang group. They will focus on the investigation of Au-ligand complexes, aimed at a better understanding of the chemical bonding properties of the gold atom. It has been found in prior research supported under this program that a gold atom can behave like a hydrogen atom in certain Au-containing clusters. The Wang group is interested in probing further the covalent bonding characters of Au with various chemical ligands. Gold complexes have increasingly been found to catalyze important organic transformations in solution. A deeper understanding of the chemical bonding properties of the gold atom can provide insight into the intermediates and mechanisms of homogeneous catalysis by gold complexes.Gold nanoparticles have a wide range of applications in catalysis, molecular electronics and biology. Careful studies like those of Prof. Wang and his group build a knowledge base of the electronic and chemical properties of these species which help to inform the various nanotechnology areas where these substances play a role. The students receiving research training in Prof. Wang's research group will learn to use sophisticated equipment in a unique university/national laboratory environment. Prof. Wang's gold cluster research has captured the public interest, and Prof. Wang continues to be an excellent ambassador for science.

在这个由化学系化学结构、动力学和机制计划资助的项目中，布朗大学的王来胜教授将与他的研究生和本科生研究人员一起研究大金团簇的结构以及掺杂原子如何改变金团簇的性质。 这些集群将产生激光汽化，并将通过结合质谱和光电子能谱辅助理论计算进行研究。 本研究的最终目标是了解金纳米颗粒新的催化性能的机制。 为此，研究小组还将对吸附在金团簇上的CO和O2进行研究，这将有助于从分子水平上理解金纳米颗粒氧化CO的过程。另外，研究小组还将开展利用电喷雾电离和光电子能谱技术研究气相中的溶液相分子的研究。 他们将专注于金配体络合物的研究，旨在更好地了解金原子的化学键合性质。 在该计划支持的先前研究中已经发现，在某些含Au的簇中，金原子可以表现得像氢原子。 Wang研究组对进一步探索Au与各种化学配体的共价键特征很感兴趣。 越来越多的研究发现金配合物在溶液中催化重要的有机转化。 对金原子化学键性质的深入了解，有助于了解金配合物均相催化的中间体和机理，金纳米粒子在催化、分子电子学和生物学等领域有着广泛的应用。像王教授和他的团队这样的仔细研究建立了这些物质的电子和化学性质的知识库，这有助于为这些物质发挥作用的各种纳米技术领域提供信息。在王教授的研究小组接受研究培训的学生将在独特的大学/国家实验室环境中学习使用先进的设备。王教授的金团簇研究引起了公众的兴趣，王教授继续成为一名优秀的科学大使。