Photoinduced Electron and Energy Transfer in Molecular Assemblies

该奖项在无机，生物无机和有机化学 该计划支持托马斯J. 北卡罗来纳州查珀尔大学化学系的迈耶说， 之丘 金属-配体电荷转移（MLCT）激发态 将研究分子组装体中的多吡啶络合物， 更好地理解光生电子的一般现象， 能量转移 发色团猝灭剂和配体桥接的组装体将 合成。 这些新组件将专为 研究以下内容：（a）新的物理现象 特别是在Marcus倒置区域，包括分子内 竞争，时间延迟和多光子效应;（B）新的 结构基序，基于顺/反异构不对称 取代的联吡啶配体;（c）光化学的长寿命储存 通过使用桥接电子转移配体的氧化还原等价物; 和（d）光化学能量转换。 光谱参数将是 用于计算电子转移速率常数。 大分子电子性质的研究 分子的结合，或组装，最终的目的是 分子级电子器件的发展。 本研究是 与光化学能量转换和信息存储相关的 颜色的变化。 为了发展这项技术，电子在 必须更好地理解长距离和长时间尺度。

This award in the Inorganic, Bioinorganic, and Organometallic Chemistry Program supports research on electron transfer reactions by Dr. Thomas J. Meyer of the Chemistry Department, University of North Carolina at Chapel Hill. Metal-to-ligand charge transfer (MLCT) excited states of polypyridyl complexes in molecular assemblies will be studied in order to better understand the general phenomenon of photoinduced electron and energy transfer. Chromophore-quencher and ligand-bridged assemblies will be synthesized. These new assemblies will be designed for the investigation of the following: (a) novel photophysical phenomena particularly in the Marcus inverted region, including intramolecular competition, time delays, and multi-photon effects; (b) the role of new structural motifs, based on cis/trans isomerism at unsymmetrically substituted bipyridine ligands; (c) long-lived storage of photochemical redox equivalents through the use of bridging electron transfer ligands; and (d) photchemical energy conversion. Spectroscopic parameters will be used to calculate electron transfer rate constants. Investigation of the electronic properties of large molecules and associations of molecules, or assemblies, is ultimately aimed at development of molecular-level electronic devices. This research is relevant to photochemical energy conversion and information storage based on color changes. To develop this technology, movement of electrons over long distances and over long time scales must be better understood.