Photoisomerization: New Complexes, Circular Dichroism, and the Faraday Effect

光异构化：新配合物、圆二色性和法拉第效应

基本信息

批准号：
1856492
负责人：
Jeffrey Rack
金额：
$ 39万
依托单位：
University of New Mexico
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-08-01 至 2022-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1856492&HistoricalAwards=false
关键词：
Photoisomerization New Complexes Circular Dichroism

项目摘要

Complexes that undergo a change in color when exposed to light are termed photochromic. These types of compounds have a variety of applications in diverse settings including computing and photonic materials. This research program is dedicated to understanding how these photochromic compounds (and ultimately materials) interact with light to generate color changes. Most of the known photochromic compounds operate through a light-triggered molecular rearrangement that occurs on an ultrafast timescale (picosecond). There are many unanswered questions regarding how molecules convert light energy into potential energy to initiate molecular rearrangement. A new aspect of this research program is the development of new optical experimental techniques to monitor structural and magnetic changes in molecules on very short timescales. Professor Jeffrey Rack at the University of New Mexico is engaged in a series of outreach efforts to encourage students to pursue careers in STEM disciplines. He has a particular interest in supporting Native American students, Hispanic students, and women in their career development. The project provides experience in the design of instrumentation to address questions at the interface between chemistry and physics. The multidisciplinary nature of the project demand that the student researchers be aware of literature contributions in disparate research areas.This research award in the Chemical Structure, Dynamics and Mechanisms B Program within the Division of Chemistry at NSF supports the research efforts of Professor Jeffrey Rack at University of New Mexico to investigate a new class of transition metal complexes which change structure and color when exposed to solar radiation (light). These studies focus on discovering the kinetic and thermodynamic parameters for the action of this unique family of chromophores that utilize light to break and make bonds on a very fast timescale. The mode of action in these complexes is an excited state isomerization of the bound sulfoxide ligand. In addition, two new instrumental techniques are introduced. First, Professor Rack is studying the development of a time-resolved circular dichroism to monitor chirality changes, not only in transition metal sulfoxide complexes, but also in chiral sulfoxide compounds. Second, Professor Rack is developing a Faraday rotation spectroscopic instrument, which monitors magnetic fields in compounds and materials. This technique is used to monitor the creation and fate of triplet states in molecular photophysics. Professor Jeffrey Rack at the University of New Mexico is engaged in a series of outreach efforts to encourage students to pursue careers in STEM disciplines, and has a particular interest in supporting Native American students, Hispanic students, and women in their career development.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.

暴露于光线时会发生变化的复合物称为光致变色。这些类型的化合物在包括计算和光子材料在内的各种设置中具有多种应用。该研究计划致力于了解这些光致变色化合物（以及最终材料）如何与光相互作用以产生颜色变化。大多数已知的光致变色化合物通过在超快时间尺度（Picsecond）上发生的光触发分子重排起作用。关于分子如何将光能转化为势能以启动分子重排的问题有许多未解决的问题。该研究计划的一个新方面是开发新的光学实验技术，以监测非常短的时间尺度分子的结构和磁变化。新墨西哥大学的杰弗里·克拉克（Jeffrey Rack）教授正在进行一系列的外展工作，以鼓励学生从事STEM学科的职业。他对支持美国原住民学生，西班牙裔学生和女性在职业发展方面特别感兴趣。该项目提供了仪器设计的经验，可以解决化学与物理之间界面的问题。 The multidisciplinary nature of the project demand that the student researchers be aware of literature contributions in disparate research areas.This research award in the Chemical Structure, Dynamics and Mechanisms B Program within the Division of Chemistry at NSF supports the research efforts of Professor Jeffrey Rack at University of New Mexico to investigate a new class of transition metal complexes which change structure and color when exposed to solar radiation (light).这些研究着重于发现这种独特的发色团家族的动力学和热力学参数，这些发色团家族利用光来破坏并在非常快的时间表上建立键。这些复合物中的作用方式是固定硫氧化物配体的激发态异构化。此外，还引入了两种新的仪器技术。首先，RACK教授正在研究时间分辨的圆形二分性能的发展，以监测手性变化，不仅在过渡金属亚硫氧化物络合物中，而且在手性磺胺氧化物化合物中。其次，Rack教授正在开发Faraday旋转光谱仪器，该仪器在化合物和材料中监视磁场。该技术用于监测分子光物理学中三重态的创造和命运。新墨西哥大学的杰弗里·克拉克（Jeffrey Rack）教授从事一系列的宣传工作，以鼓励学生从事STEM学科的职业，并特别有兴趣支持美国原住民学生，西班牙裔学生和职业发展中的女性。这项奖项反映了NSF的法定任务，并通过评估基金会的智力效果和广泛的范围来反映出值得评估的支持。

项目成果

期刊论文数量（12）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Donor–Acceptor Conjugated Copolymers Containing Transition-Metal Complex: Intrachain Magnetic Exchange Interactions and Magneto-Optical Activity

DOI：
10.1021/acs.chemmater.2c01433
发表时间：
2022-06
期刊：
Chemistry of Materials
影响因子：
8.6
作者：
Xunshan Liu;Jiaze Xie;J. Niklas;Emigdio E. Turner;Dafei Yuan;John S. Anderson;J. Rack;O. Poluektov;Luping Yu
通讯作者：
Xunshan Liu;Jiaze Xie;J. Niklas;Emigdio E. Turner;Dafei Yuan;John S. Anderson;J. Rack;O. Poluektov;Luping Yu

A Future Perspective on Phototriggered Isomerizations of Transition Metal Sulfoxides and Related Complexes

过渡金属亚砜及相关配合物光引发异构化的未来展望

DOI：
10.1021/jacs.0c08820
发表时间：
2021
期刊：
Journal of the American Chemical Society
影响因子：
15
作者：
Vittardi, Sebastian B.;Thapa Magar, Rajani;Breen, Douglas J.;Rack, Jeffrey J.
通讯作者：
Rack, Jeffrey J.

Trifluoromethylated Phenanthroline Ligands Reduce Excited-State Distortion in Homoleptic Copper(I) Complexes

DOI：
10.1021/acs.inorgchem.9b03146
发表时间：
2020-03-02
期刊：
INORGANIC CHEMISTRY
影响因子：
4.6
作者：
Livshits, Maksim Y.;Reeves, Brian J.;Rack, Jeffrey J.
通讯作者：
Rack, Jeffrey J.

Finely Designed P3HT-Based Fully Conjugated Graft Polymer: Optical Measurements, Morphology, and the Faraday Effect

精心设计的基于 P3HT 的全共轭接枝聚合物：光学测量、形态学和法拉第效应

DOI：
10.1021/acsami.0c08170
发表时间：
2020
期刊：
ACS Applied Materials & Interfaces
影响因子：
9.5
作者：
Liu, Xunshan;Turner, Emigdio E.;Sharapov, Valerii;Yuan, Dafei;Awais, Mohammad A.;Rack, Jeffrey J.;Yu, Luping
通讯作者：
Yu, Luping

Manipulating Excited State Properties of Iridium Phenylpyridine Complexes with “Push–Pull” Substituents

操纵具有“推拉”取代基的铱苯基吡啶配合物的激发态性质

DOI：
10.1021/acs.inorgchem.2c02269
发表时间：
2022
期刊：
Inorganic Chemistry
影响因子：
4.6
作者：
Turner, Emigdio E.;Breen, Douglas J.;Kosgei, Gilbert;Crandall, Laura A.;Curtin, Gregory M.;Jakubikova, Elena;O’Donnell, Ryan M.;Ziegler, Christopher J.;Rack, Jeffrey J.
通讯作者：
Rack, Jeffrey J.