Electron Spin Resonance in the Undergraduate Curriculum

本科课程中的电子自旋共振

• 批准号: 9850991
• 负责人: David Collard
• 金额: $ 8.65万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9850991&HistoricalAwards=false
• 关键词: Electron; Spin; Resonance; Undergraduate; Curriculum

The treatment of odd-electron species in the undergraduate curriculum includes discussion of radicals in organic chemistry and transition metal-containing compounds in both the inorganic and biochemistry lecture sequences. Although discussion of inorganic compounds with unpaired electrons is a vital component of the undergraduate chemistry syllabus, radicals are often quickly dismissed in the undergraduate organic chemistry curriculum as short-lived intermediates, ignoring the existence of stable radicals, and missing the opportunity to reinforce concepts in structure and bonding. Unfortunately, direct experimental evidence for odd-electron species and their reactivity are not usually presented at all. The project will purchase an Electron Spin Resonance (ESR) spectrometer for use in the undergraduate curriculum. This will facilitate the development and demonstration of important ideas in physical chemistry (analogy between ESR and NMR), organic chemistry (interpretation of electron-nuclear spin coupling as an extension of the concept covered in discussion of NMR), materials chemistry (role and nature of unpaired electrons in conducting polymers and conducting metal oxides), inorganic chemistry (elucidation of molecular structure, bonding theory, stability and the 18 electron rule) and biochemistry (redox behavior of metalloproteins). The instrument will allow us to develop and implement new experiments that will enhance students' understanding of fundamental ideas in structure and bonding. It will be used by 300 students per year in sophomore-level synthesis laboratory course, by junior and senior chemistry majors, and for undergraduate research. New experiments for the undergraduate laboratories are being developed as part of a curriculum reform in response to a change from a quarter based system to a semester based academic calendar. Treatment of ESR in the laboratory sequence offers a unique opportunity to explore new pedagogies for the treatment of odd-electron species, an area w hich we feel is currently lacking emphasis. As experiments are developed they will be made available for adoption elsewhere.

在本科课程中奇电子物种的处理包括在无机和生物化学讲座序列中讨论有机化学中的自由基和含过渡金属的化合物。 虽然讨论具有未成对电子的无机化合物是本科化学教学大纲的重要组成部分，但在本科有机化学课程中，自由基通常很快被视为短暂的中间体，忽略了稳定自由基的存在，并错过了加强结构和键合概念的机会。 不幸的是，奇电子物种及其反应性的直接实验证据通常根本没有提出。 该项目将购买电子自旋共振（ESR）光谱仪用于本科课程。 这将促进物理化学中重要思想的发展和论证（ESR和NMR之间的类比），有机化学（将电子-核自旋耦合解释为NMR讨论中涵盖的概念的扩展），材料化学导电聚合物和导电金属氧化物中不成对电子的作用和性质（分子结构、成键理论、稳定性和18电子规则的阐明）和生物化学（金属蛋白的氧化还原行为）。 该仪器将使我们能够开发和实施新的实验，这将提高学生对结构和键合基本思想的理解。 它将用于300名学生，每年在大学生水平的综合实验室课程，由初级和高级化学专业，并为本科生的研究。 作为课程改革的一部分，正在为本科生实验室开发新的实验，以应对从季度为基础的系统到学期为基础的学术日历的变化。 在实验室序列ESR的治疗提供了一个独特的机会，探索新的治疗奇电子物种，一个领域，我们认为是目前缺乏重视。 随着实验的发展，它们将可供其他地方采用。