RUI: An Experimental and Theoretical Study of Stannylcarbenes

RUI：锡烷基卡宾的实验和理论研究

• 批准号: 1955874
• 负责人: Dasan Thamattoor
• 金额: $ 32万
• 依托单位: Colby College
• 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: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1955874&HistoricalAwards=false
• 关键词: RUI; Experimental; Theoretical; Study; Stannylcarbenes

In this RUI project, funded by the Chemical Structure, Dynamics & Mechanism B Program of the Chemistry Division, Professor Thamattoor of the Department of Chemistry at Colby College, and his team of undergraduate students, are investigating tin-substituted carbenes by experimental and theoretical methods. Carbenes are highly reactive chemical species which feature a carbon that has only two bonds instead of the usual four. Carbenes that are coordinated with a variety of metals have played important roles in the production of commercially valuable materials. However, much less is known about carbenes in which one or both bonds of the carbon are attached to a metal. This research aims to address this gap in knowledge. This project also includes efforts to persuade high school students to consider STEM (Science, Technology, Engineering and Mathematics) disciplines in college. Professor Thamattoor provides research opportunities to high school students in the laboratory. The group also works with teachers in the local grade schools to deliver quality instruction in STEM subjects. In recognition of the importance of global scientific cooperation, undergraduate students are provided with research opportunities in international laboratories.Metal-coordinated carbene complexes are well known compounds that have had a transformative impact on synthesis and catalysis. In contrast, very little is known about uncomplexed metal-substituted carbenes, where the metal is one (or both) of the substituents on the divalent carbon. Through this RUI (Research at Undergraduate Institutions) grant, a comprehensive set of projects is being undertaken to study stannylcarbenes. These intermediates are generated photochemically from new precursors based on cyclopropanated phenanthrene and indan systems. The structure and reactivity of these tin-substitued carbenes are investigated experimentally by steady state photolysis, electron paramagnetic resonance spectroscopy, matrix isolation spectroscopy, and time-resolved laser flash photolysis, as well as by modern computational methods. In addition, several initiatives to create international research opportunities for undergraduates, and to promote high-quality STEM education for grade K -12 students in area schools are being pursued. The integrated research and outreach activities enrich the undergraduate research experience at Colby College, and also serve the local community.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.

在这个由化学系化学结构、动力学机制B计划资助的RUI项目中，科尔比学院化学系的Thamattoor教授和他的本科生团队正在通过实验和理论方法研究锡取代的卡宾。卡宾是高度反应性的化学物种，其特征在于碳只有两个键而不是通常的四个键。与多种金属配位的卡宾在生产有商业价值的材料中发挥了重要作用。然而，对于碳的一个或两个键都连接到金属上的卡宾知之甚少。这项研究旨在解决这一知识差距。该项目还包括努力说服高中生在大学中考虑STEM（科学，技术，工程和数学）学科。 Thamattoor教授在实验室为高中生提供研究机会。 该组织还与当地小学的教师合作，提供STEM科目的优质教学。为了认识到全球科学合作的重要性，本科生提供了在国际实验室的研究机会。金属配位卡宾配合物是众所周知的化合物，对合成和催化产生了变革性的影响。相比之下，对未络合的金属取代的卡宾知之甚少，其中金属是二价碳上的一个（或两个）取代基。 通过这一RUI（研究在本科院校）赠款，一套全面的项目正在进行研究锡基卡宾。 这些中间体是由基于环丙烷化菲和茚满体系的新前体光化学生成的。这些锡取代卡宾的结构和反应性的实验研究稳态光解，电子顺磁共振光谱，基质隔离光谱，时间分辨激光闪光光解，以及通过现代计算方法。此外，正在实施几项举措，为本科生创造国际研究机会，并促进地区学校K-12年级学生的高质量STEM教育。综合研究和外展活动丰富了科尔比学院的本科生研究经验，也为当地社区服务。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。