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.

在这个由化学结构，动力学和机制化学划分的项目资助的项目中，布朗大学的莱尚·王（Lai-Sheng Wang）教授以及他的毕业生和本科生研究人员将研究大型金簇的结构以及如何通过popant Atoms修改金簇的特性。 这些簇将通过激光蒸发产生，并将通过理论计算的辅助质谱和光电光谱法的结合来研究。 这项研究的最终目标是了解针对金纳米颗粒发现的新催化特性的机制。 为此，Wang组还将研究CO和O2吸附在金簇上，这将有助于分子级别对金纳米粒子对CO氧化的理解。在该程序的支持下，在该程序支持下追求的另一个研究方向是，使用电源剂量离子化和光电学光谱型组合的气体相分子研究解决方案阶段分子，这是一个独特的实验组合。 他们将重点关注对Au-crigand复合物的研究，以更好地理解黄金原子的化学键合特性。 在该计划下支持的先前研究中发现，在某些含有AU的簇中，黄金原子可以像氢原子一样行为。 王组有兴趣进一步探测AU与各种化学配体的共价键合特征。 越来越多地发现黄金复合物可以催化溶液中的重要有机转化。 对黄金原子的化学键合特性的更深入的理解可以深入了解金复合物的中间体和均质催化机制。金纳米颗粒在催化，分子电子和生物学中具有广泛的应用。像Wang教授及其小组这样的仔细研究建立了这些物种的电子和化学特性的知识基础，这些知识基础有助于告知这些物质发挥作用的各种纳米技术领域。接受Wang教授研究小组研究培训的学生将学习在独特的大学/国家实验室环境中使用复杂的设备。王教授的黄金集群研究吸引了公共利益，王教授仍然是科学的出色大使。