Systematic Modulation of Lanthanide Physical Properties Using Functionalized Metallacrowns

本课题由化学系化学结构、动力学机理B项目资助，由美国加州大学伯克利分校的Vincent L.位于安阿伯的密歇根大学化学系的Pecoraro正在开发一类含有镧系元素离子的金属大环化合物。 本研究的目标是了解镧系元素离子的电子性质，这些电子性质对各种现代技术至关重要，例如磁性材料，白色光显示和生物系统中的发光成像。此外，这些研究旨在为制造新的分子纳米温度计奠定基础，这些分子纳米温度计可以在电子工业和基础生物研究中的广泛温度范围内使用，或最终在临床上测量细胞器或动物组织内的温度。该项目位于有机，无机，材料化学和生物化学的界面。这项研究非常适合各级科学家的教育。 还计划通过一般性的兴趣介绍，向非专业公众进行宣传。例如，Pecoraro教授将在美国和欧洲发表与其研究有关的公开讲座。 Pecoraro教授有支持教育和培训学生在科学中代表性不足的历史，这些活动将继续下去。 含镧系元素的金属冠醚可以用来理解镧系元素的基本性质。因为这些离子在它们的f轨道中包含电子，这些电子在d轨道内收缩，所以它们具有与分子磁性，磁冷却剂和发光发射相关的有趣特性。在这个项目中，金属冠醚将准备回答以下问题：（一）分子对称性和配位数如何影响镧系元素的电子结构，是高发射或显示单离子慢磁弛豫？(ii)可以metallacrowns被用作发射核心的类聚合物称为树枝状聚合物，这是被应用于各种先进的应用在化学和生物学;和（iii）可以使用磁场来询问激发基态的镧系元素来理解，并计算，基态混合到这些激发态的程度？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知识价值和更广泛的影响审查标准进行评估的支持。

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.