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Synthesis, Characterization, and Reactivity Studies of Cerium, Thorium, and Uranium-Ligand Multiple Bonds

铈、钍和铀-配体多重键的合成、表征和反应性研究

基本信息

批准号：
1955724
负责人：
Eric Schelter
金额：
$ 49.5万
依托单位：
University of Pennsylvania
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-08-01 至 2023-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1955724&HistoricalAwards=false
关键词：
Synthesis Characterization Reactivity Studies Cerium

项目摘要

With support from the Chemical Synthesis Program in the Chemistry Division, Professor Eric Schelter at the University of Pennsylvania is investigating the chemistry of cerium, thorium, and uranium compounds. His team is testing new ways that these metals form chemical bonds to nitrogen and phosphorus. The resulting compounds will be evaluated for their relevance to the production of nitrogen- and phosphorus-containing pharmaceuticals and new materials. The project is particularly focused on ways that organic scaffolds can be build to wrap around the metals in ways that stabilize new kinds of bonds. Guidance and insight into the new bonding patterns are obtained by comparing the structures of the various cerium vs thorium vs uranium compounds. Rare earth materials are used extensively in diverse applications such as catalysts, phosphors and polishing compounds as well as for illuminated screens on electronic devices and air pollution control.Professor Schelter supervises a laboratory that provides graduate and undergraduate students with both theoretical and hands-on experimental training in the synthesis and reactivity of the rare earth elements. The effort supports outreach projects for elementary and high school students; Young students are instructed about the technology and strategic importance of rare earth elements.With support from the Chemical Synthesis Program in the Chemistry Division, Professor Eric Schelter at the University of Pennsylvania leads a program aimed at understanding cerium-ligand multiple bonds. The research will establish their d/f bonding patterns and electronic structures using spectroscopy and computation. Comparative reactivity studies with 5f-element congeners will provide fundamental insights into chemical bonding. The central hypothesis is that control of the relatively large 5d- character in the bonding of cerium(IV) will enable isolation of new examples of metal-ligand multiple bonds. Cerium, thorium, and uranium-heteroatom multiple bonds such as nitrides, phosphinidines, and others will be synthesized and their electronic structures compared. Reactivity patterns for cerium-ligand multiple bonds will be established. The fundamental knowledge developed from the research is expected to demonstrate how bonding of elements at the key d-f interface of the periodic table could be understood, and how their chemical and reactivity properties can be leveraged for new applications. Rare earth materials are used extensively in diverse applications such as catalysts, phosphors and polishing compounds as well as for illuminated screens on electronic devices and air pollution control. Advancing the chemistry of rare earths and developing new and distinctive chemical reactions for thorium and uranium contributes to improving beneficiation and separations of those elements, and therefore national security as many of these elements are not mined in the US. This project supports instruction of high school students about the importance of rare earth elements.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学系化学合成项目的支持下，宾夕法尼亚大学的Eric Schelter教授正在研究铈、钍和铀化合物的化学性质。他的团队正在测试这些金属与氮和磷形成化学键的新方法。将评估所得化合物与含氮和含磷药物和新材料生产的相关性。该项目特别关注有机支架的构建方法，以稳定新型键的方式包裹金属。通过比较各种铈、钍和铀化合物的结构，获得了对新键合模式的指导和洞察。稀土材料广泛应用于催化剂、荧光粉、抛光剂、电子设备发光屏和空气污染控制等领域。Schelter教授管理的实验室为研究生和本科生提供稀土元素合成和反应性方面的理论和实践实验培训。这项工作支持面向中小学生的推广项目;向年轻学生介绍稀土元素的技术和战略重要性。在化学系化学合成项目的支持下，宾夕法尼亚大学的Eric Schelter教授领导了一个旨在理解铈配体多重键的项目。这项研究将使用光谱学和计算来建立它们的d/f键合模式和电子结构。与5 f元素同源物的比较反应性研究将为化学键合提供基本的见解。中心假设是控制铈（IV）键合中相对较大的5d-特征将能够分离金属-配体多重键的新实例。铈，钍和铀-杂原子多重键，如氮化物，膦，和其他将被合成和它们的电子结构进行比较。将建立铈-配体多重键的反应模式。从研究中发展出来的基础知识有望展示如何理解元素周期表中关键d-f界面的元素键合，以及如何利用它们的化学和反应特性来实现新的应用。稀土材料广泛应用于催化剂、磷光体和抛光化合物等各种应用，以及电子设备上的发光屏幕和空气污染控制。推进稀土化学和开发新的和独特的钍和铀的化学反应有助于改善这些元素的提纯和分离，因此国家安全，因为许多这些元素在美国没有开采。该项目支持高中生关于稀土元素重要性的教学。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Discovery and mechanistic investigation of photoinduced sp3 C–H activation of hydrocarbons by the simple anion hexachlorotitanate

DOI：
10.1016/j.checat.2022.02.013
发表时间：
2022-03
期刊：
Chem Catalysis
影响因子：
0
作者：
Grace B. Panetti;Qiaomu Yang;Michael R. Gau;P. Carroll;P. Walsh;E. Schelter
通讯作者：
Grace B. Panetti;Qiaomu Yang;Michael R. Gau;P. Carroll;P. Walsh;E. Schelter

Light-mediated aerobic oxidation of C(sp 3 )–H bonds by a Ce( iv ) hexachloride complex

六氯化物配合物光介导的 C(sp 3 )–H 键有氧氧化