Novel Exciplexes

新型激基复合物

基本信息

批准号：
1762365
负责人：
Joseph Dinnocenzo
金额：
$ 52.5万
依托单位：
University of Rochester
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-01 至 2022-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1762365&HistoricalAwards=false
关键词：
Novel Exciplexes

项目摘要

With this award, the Chemical Structure, Dynamics, and Mechanism B program supports the research of Professor Joseph P. Dinnocenzo at the University of Rochester. Professor Dinnocenzo and his students investigate novel exciplexes (excited state complexes), especially cationic (positively charged) exciplexes. The research activities provide foundational knowledge about electron transfer and new types of exciplexes. Substances which form exciplexes have potential applications as sensors, as biological probes, and in organic light emitting diodes (OLED). Due to their solubility in water, cationic exciplexes have enhanced potential for development of biological imaging applications. The research provides a rich educational experience for undergraduate, graduate, and postdoctoral students, in synthesis, electrochemistry and time-resolved spectroscopy. This research specifically engages undergraduates from the University of Guam (a minority institution in the US Territory) for summer research opportunities. This group is underrepresented in science, technology, engineering and mathematics (STEM).This project investigates two types of novel, charge transfer exciplex intermediates that were recently discovered in the Dinnocenzo laboratory. One type of exciplex is formed by reaction of cationic, excited state acceptors with neutral donors. Research objectives include determining the electronic nature of the exciplexes (e.g. electronic coupling matrix elements) through theoretical fitting of radiative lifetimes, which are determined by Time Correlated Single Photon Counting (TCSPC) and fluorescence spectra. This project expands the generality of cationic exciplexes by measuring some of their photophysical properties, examining cationic exciplexes in a variety of media (including water), and synthesizing intramolecular examples. A related project investigates examples uncovered in the Professor Dinnocenzo's lab where two exciplex emissions are observed from a single acceptor and donor. Preliminary results are consistent with dramatically different solvent reorganization energies for the two types of exciplexes, indicating major differences in their structures. In this research, students learn how to synthesize, purify, and spectroscopically characterize compounds. Students also receive training in a range of less traditional techniques including transient absorption spectroscopy (TCSPC), fluorometry, electrochemistry, and modern computational chemistry. The students trained through the research are prepared to tackle a variety of multidisciplinary problems in their professional careers.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.

有了这个奖项，化学结构，动力学和机制B计划支持罗切斯特大学的约瑟夫·迪诺科佐教授的研究。 Dinnocenzo教授和他的学生研究了新颖的动力（激发态综合体），尤其是阳离子（带正电荷）的动态。研究活动提供了有关电子传输和新型动力类型的基本知识。形成动态的物质具有潜在的应用作为传感器，作为生物探针，以及在有机光发射二极管（OLED）中。由于它们在水中的溶解度，阳离子的动力具有增强的生物成像应用开发潜力。这项研究为本科，研究生和博士后学生提供了丰富的教育经验，在综合，电化学和时间分辨光谱方面为学业提供了丰富的教育经验。这项研究专门吸引了关岛大学（美国领土上的少数族裔机构）的本科生，以获取夏季研究机会。该小组在科学，技术，工程和数学（STEM）方面的人数不足。该项目研究了最近在Dinnocenzo实验室发现的两种类型的新型，电荷转移Expiplex中间体。一种类型的动力由阳离子，激发状态受体与中性供体的反应形成。研究目标包括通过辐射寿命的理论拟合来确定Exoplexes的电子性质（例如电子耦合矩阵元件），这些寿命由时间相关的单个光子计数（TCSPC）和荧光光谱确定。该项目通过测量其某些光物理特性来扩大阳离子偏膜的一般性，从而在各种培养基（包括水）中检查阳离子分离术并合成分子内示例。一个相关的项目调查了Dinnocenzo教授实验室中发现的示例，其中从一个受体和捐助者中观察到了两次动力排放。初步结果与两种类型的动力学的溶剂重组能在明显不同的溶剂重组能量一致，表明其结构的主要差异。在这项研究中，学生学习如何合成，净化和光谱镜来表征化合物。学生还接受了一系列不太传统技术的培训，包括瞬态吸收光谱（TCSPC），荧光测定法，电化学和现代计算化学。经过研究培训的学生准备解决其职业职业中各种多学科问题的准备。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响评估标准通过评估来获得支持的。