Systematic Modulation of Lanthanide Physical Properties Using Functionalized Metallacrowns

使用功能化金属冠系统调控镧系元素物理性质

• 批准号: 2102046
• 负责人: Vincent Pecoraro
• 金额: $ 18.7万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-05-15 至 2023-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2102046&HistoricalAwards=false
• 关键词: Systematic; Modulation; Lanthanide; Physical; Properties

In this project, funded by the Chemical Structure, Dynamics & Mechanism B Program of the Chemistry Division, Professor Vincent L. Pecoraro of the Department of Chemistry at the University of Michigan, Ann Arbor is developing a class of metallamacrocycles containing lanthanide ions. The goal of this research is to understand the electronic properties of lanthanide ions that are critical to a vast range of modern technologies such as magnetic materials, white light displays, and luminescent imaging in biological systems. In addition, these studies seek to develop the foundation to make new molecular nanothermometers that can be used over a wide temperature range for applications in both the electronics industry as well as in basic biological research or eventually clinically to measure temperatures within cell organelles or animal tissue. The project lies at the interface of organic, inorganic, materials chemistry and biological chemistry. The research is well suited for the education of scientists at all levels. Through general interest presentation, outreach to the lay public is also planned. An example is that Professor Pecoraro will give public lectures related to his research both in the United States and Europe. Professor Pecoraro has a history of supporting the education and training for students underrepresented in science and these activities will continue. Lanthanide containing metallacrowns can be exploited to understand the fundamental properties of lanthanides. Because these ions contain electrons in their f-orbitals, which are contracted within the d-orbitals, they have interesting properties related to molecular magnetism, magnetocoolants and luminescent emission. In this project, metallacrowns will be prepared to answer the following questions: (i) How does the molecular symmetry and coordination number influence the electronic structure of lanthanides that are highly emitting or display single ion slow magnetic relaxation? (ii) Can metallacrowns be used as emitting cores for the class of polymers known as dendrimers, which are being applied for a variety of advanced applications in chemistry and biology; and (iii) Can one use magnetic fields to interrogate the excited ground states of lanthanides to understand, and calculate, the extent of ground state mixing to these excited states?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.

在这个由化学部门化学结构、动力学和机理B项目资助的项目中，密歇根大学安娜堡分校化学系的Vincent L. Pecoraro教授正在开发一类含有镧系离子的金属宏环。本研究的目标是了解镧系离子的电子特性，镧系离子对磁性材料、白光显示器和生物系统中的发光成像等广泛的现代技术至关重要。此外，这些研究旨在为制造新的分子纳米温度计奠定基础，该温度计可以在广泛的温度范围内应用于电子工业以及基础生物学研究或最终临床测量细胞器或动物组织内的温度。本项目处于有机化学、无机化学、材料化学和生物化学的交叉点。这项研究非常适合各级科学家的教育。通过普遍的兴趣展示，还计划向非专业公众推广。例如，佩科拉罗教授将在美国和欧洲进行与他的研究有关的公开讲座。佩科拉罗教授一直支持在科学领域代表性不足的学生的教育和培训，这些活动将继续下去。含镧系元素的金属冕可以用来了解镧系元素的基本性质。因为这些离子在它们的f轨道上含有电子，这些电子在d轨道内收缩，它们具有与分子磁性，磁冷却剂和发光发射有关的有趣性质。在这个项目中，金属王冠的制备将回答以下问题：(i)分子对称性和配位数如何影响高发射或显示单离子慢磁弛豫的镧系元素的电子结构？金属冠能否用作被称为树突状聚合物的一类聚合物的发射核，树突状聚合物目前正用于化学和生物学的各种高级应用；（iii）是否可以利用磁场来询问镧系元素的激发态，以理解和计算基态与这些激发态混合的程度？该奖项反映了美国国家科学基金会的法定使命，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。