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.

在这个由化学部化学结构、动力学和机理项目资助的项目中，布朗大学王来生教授与他的研究生和本科生研究人员将研究大型金团簇的结构以及金的性质如何簇可以通过掺杂原子进行修饰。 这些团簇将通过激光汽化产生，并将通过质谱法和光电子能谱法结合理论计算进行研究。 这项研究的最终目标是了解金纳米颗粒新催化特性的机制。 为此，王教授课题组还将研究金簇上吸附的CO和O2，这将有助于从分子水平上理解金纳米颗粒对CO的氧化作用。该项目支持下的另一个研究方向是研究溶液相分子在气相中使用电喷雾电离和光电子能谱，这是王小组开发的一种独特的实验技术。 他们将重点研究金配体配合物，旨在更好地了解金原子的化学键合特性。 在该计划支持的先前研究中发现，金原子在某些含金簇中的行为可以像氢原子一样。 Wang 小组有兴趣进一步探讨 Au 与各种化学配体的共价键合特征。 人们越来越多地发现金络合物可以催化溶液中重要的有机转化。 深入了解金原子的化学键合特性，可以深入了解金配合物均相催化的中间体和机理。金纳米颗粒在催化、分子电子学和生物学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，这有助于了解这些物质发挥作用的各个纳米技术领域。在王教授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精密设备。王教授的金簇研究引起了公众的兴趣，王教授仍然是优秀的科学大使。