CAS: Achieving Long Lived Charge Separated States in Donor-Bridge-Acceptor Dyads Based on 3d Alkynyls – a Synthetic Approach

CAS：基于 3d 炔基在供体-桥-受体二元组中实现长寿命电荷分离态 — 一种合成方法

• 批准号: 2102049
• 负责人: Tong Ren
• 金额: $ 53.8万
• 依托单位: Purdue University
• 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: 2021-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2102049&HistoricalAwards=false
• 关键词: CAS; Achieving; Long; Lived; Charge

With funding from the Chemical Synthesis program in the Division of Chemistry, Professor Tong Ren at Purdue University will prepare conjugated metal complexes of interesting photo-activity based on earth abundant metals. Chemists and material scientists have made great stride in molecular photovoltaics using so called dye-sensitized solar cells. The key molecules for the initial capture of solar energy are all based on rare precious metals such as Ru and Ir. Hence, it is highly desirable to develop molecules of similar capturing capability but based on earth abundant metals such as Cr, Fe and Co. However, most of compounds based on earth abundant metals lose the captured solar energy (so called excited state) before converting it into electricity. Professor Ren and his coworkers will extend the lifetime of excited states by using a new family of macrocycles to support Fe and Co containing molecules, and hence improve the conversion efficiency of solar energy to electricity. Professor Ren will work with a group of graduate and undergraduate students from diverse backgrounds. Through Purdue Science Express, he and his students will strive to improve the high school STEM education in the rural areas in Indiana through sharing laboratory equipment sets and designing new laboratory curriculum.The chemistry of metal alkynyls is a vibrant and evolving field, on which important technological advances including photovoltaics, photo-catalysis and molecular electronic devices have been achieved. This project will seek to develop unsymmetric bis-alkynyl complexes with long lived charge separated excited states based on the combination of earth abundant 3d metals and unsaturated [14]-tetraene-N4 macrocycles. The initial effort will be directed at the identification/preparation of suitable M([14]-tetraene-N4) starting materials, where M is Co(III) or Fe(III) and L is one of the three [14]-tetraene-N4 macrocycles, HMTI, TIM and TMTI. The ensuing effort will be focused on both the development of high yield preparation of the D-B-A dyads, and the understanding of donor/acceptor properties through voltammetry, steady state emission spectroscopy and ground state DFT calculations. The later phase of the project will be focused on the dynamics of the excited states. Through collaborations, significant aspects include the temporal and spatial evolution of the MLCT states in [M(II)( [14]-tetraene-N4)] complexes will be studied using fs M-edge XANES technique and companion high level CASSCF/CASPT2 analysis; and the dynamics of photo-induced electron transfer with the D-B-A dyad using both pump-probe and time-resolved IR techniques.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.

在化学系化学合成项目的资助下，普渡大学的Tong Ren教授将基于地球丰富的金属制备具有有趣光活性的共轭金属配合物。化学家和材料科学家利用所谓的染料敏化太阳能电池在分子光化学方面取得了很大进展。最初捕获太阳能的关键分子都是基于稀有贵金属，如Ru和Ir。因此，非常希望开发具有类似捕获能力但基于地球丰富金属，如Cr，Fe和Co的分子。然而，大多数基于地球丰富金属的化合物在将其转化为电能之前会失去捕获的太阳能（所谓的激发态）。 任教授和他的同事们将通过使用一种新的大环家族来支持含Fe和Co的分子，从而延长激发态的寿命，从而提高太阳能到电能的转换效率。任教授将与一群来自不同背景的研究生和本科生合作。通过普渡科学快车，他和他的学生们将通过共享实验室设备和设计新的实验室课程，努力改善印第安纳州农村地区的高中STEM教育。金属炔基化合物化学是一个充满活力和不断发展的领域，在这一领域取得了重要的技术进步，包括光化学，光催化和分子电子器件。该项目将寻求开发基于地球丰富的3d金属和不饱和[14]-四烯-N4大环组合的具有长寿命电荷分离激发态的不对称双炔基配合物。最初的努力将针对合适的M（[14]-四烯-N4）起始材料的鉴定/制备，其中M是Co（III）或Fe（III），L是三种[14]-四烯-N4大环化合物HMTI、TIM和TMTI中的一种。随后的努力将集中在两个高产率制备的D-B-A二联体的发展，并通过伏安法，稳态发射光谱和基态DFT计算的供体/受体性质的理解。该项目的后期阶段将专注于激发态的动力学。通过合作，重要的方面包括[M（II）]中MLCT状态的时间和空间演化（[14]-tetraene-N4）]配合物将用fs M-edge XANES技术和伴随的高水平CASSCF/CASPT 2分析进行研究;以及用泵浦-探测和时间-激发两种方法研究了D-B-A二元体系的光诱导电子转移动力学。该奖项反映了NSF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。

项目成果

Phenylene as an efficient mediator for intermetallic electronic coupling

亚苯基作为金属间电子耦合的有效介体

• DOI: 10.1039/d2cc00949h
• 发表时间: 2022
• 期刊: Chemical Communications
• 影响因子: 4.9
• 作者: Miller-Clark, Lyndsy A.;Raghavan, Adharsh;Clendening, Reese A.;Ren, Tong
• 通讯作者: Ren, Tong

A Series of Mono- and Bis-Alkynyl Co(III) Complexes Supported by a Tetra-imine Macrocyclic Ligand (TIM)

• DOI: 10.1021/acs.organomet.1c00423
• 发表时间: 2021-09
• 期刊: Organometallics
• 影响因子: 2.8
• 作者: Leobardo Rodriguez Segura;Seul Ah Lee;Brandon L Mash;Ashley J. Schuman;T. Ren

Further Studies of Co III (TIM) Mono‐Alkynyl and Bis‐Alkynyl Complexes

Co III (TIM) 单炔基和双炔基配合物的进一步研究

• DOI: 10.1002/ejic.202200641
• 发表时间: 2022
• 期刊: European Journal of Inorganic Chemistry
• 影响因子: 2.3
• 作者: Rodriguez Segura, Leobardo;Cox, Kenneth E.;Samayoa‐Oviedo, Hugo Y.;Ren, Tong
• 通讯作者: Ren, Tong

Mono‐ and Bis‐Alkynyl Iron Complexes Supported by a “Softened” Tetraaza Macrocycle

“软化”四氮杂大环支持的单炔基铁配合物和双炔基铁配合物

• DOI: 10.1002/ejic.202101021
• 发表时间: 2022
• 期刊: European Journal of Inorganic Chemistry
• 影响因子: 2.3
• 作者: Clendening, Reese A.;Ren, Tong
• 通讯作者: Ren, Tong

Nanosecond Metal-to-Ligand Charge-Transfer State in an Fe(II) Chromophore: Lifetime Enhancement via Nested Potentials

Fe(II) 发色团中的纳秒金属到配体的电荷转移状态：通过嵌套电势延长寿命

• DOI: 10.1021/jacs.2c13532
• 发表时间: 2023
• 期刊: Journal of the American Chemical Society
• 影响因子: 15
• 作者: Malme, Justin T.;Clendening, Reese A.;Ash, Ryan;Curry, Taylor;Ren, Tong;Vura-Weis, Josh
• 通讯作者: Vura-Weis, Josh