Photophysics, Exciton and Charge Transport in Conjugated Organometallic Oligomers and Aggregates

共轭有机金属低聚物和聚集体中的光物理学、激子和电荷传输

• 批准号: 0515066
• 负责人: Kirk Schanze
• 金额: $ 39万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2012-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0515066&HistoricalAwards=false
• 关键词: Photophysics; Exciton; Charge; Transport; Conjugated

This award by the Inorganic, Bioinorganic and Organometallic Chemistry program supports research by Professor Kirk S. Schanze of the University of Florida to pursue studies on the "Photophysics, Exciton and Charge Transport in Conjugated Organometallic Oligomers and Aggregates." Excited-state properties along with charge and exciton transport in metal-containing pi-conjugated oligomers and supramolecular assemblies will be examined. The overall objectives are to develop a clear understanding of excited state delocalization, energy, and charge transport within isolated single chains of organometallic pi-conjugated systems (molecular wires) and within supramolecular aggregates produced by self-assembly of pi-conjugated monomers. Several molecular systems will be studied. 1) A family of metal-acetylide oligomers that contain repeat units consisting of trans-(Ar-C=C-)2M(P-P)2 moieties (M = Ru and Os, and P-P is a diphosphine) will be investigated in order to determine the factors that control excited state delocalization in organometallic pi-conjugated systems. 2) The nature of the triplet excited state will be probed in a series of platinum(II)-capped polyynes of the type, trans,trans-Ar(P)2Pt-(C=C)n-Pt(P)2Ar in order to define the relationship between excited state properties and carbon chain length. 3) A series of long-chain, monodisperse Pt-acetylide oligomers will be studied to determine the rates of triplet exciton and negative polaron transport through single organometallic conjugated chains. 4) Photophysical and exciton transport studies will be extended to well-defined supramolecular aggregates formed by self-assembly of a) pi-conjugated rigid-rod Pt-acetylide oligomers capped with one or more long alkyl chains, or b) hexabenzocoronenes functionalized with metal complex chromophores. The objective of this work will be to determine the effect of aggregation on the properties of the triplet state and to study triplet exciton migration in well defined supramolecular aggregates.This investigation is directly relevant to emerging technologies that have a significant potential to benefit society, the economy, and improve the nation's defense capabilities. Specifically, the materials that are the focuses of this work have applications in opto-electronic devices such as visible and near infrared light emitting diodes (novel light sources), photovoltaic cells (light to electrical energy conversion), non-linear optics (laser protection and color shifting) and sensors (chemical- and bio-agent detection). This program also serves as the primary research training conduit for undergraduate and graduate students. The broader impacts of this project are augmented by the Light and Matter Outreach program at the University of Florida, through which PI, graduate students and undergraduate students will bring photochemistry related scientific demonstrations to middle schools in the North Florida region.

该奖项由佛罗里达大学的柯克·S·Schanze（Kirk S. Schanze）教授的研究颁发，该奖项旨在研究“光体物理学，激子和电荷运输在共轭器官分解的金属寡聚物和聚集体中”。将检查激发状态的特性以及含金属偶联的寡聚物和超分子组件中的电荷和激子传输。总体目标是对激发态到达的态定位，能量和电荷转运的清晰了解，内部有机金属链偶联系统（分子线）以及由PI结合单体自组成产生的超分子聚集体中的孤立单链。将研究几个分子系统。 1）将研究一个由反式（AR-C = C-）2M（P-P）2个部分组成的重复单位的金属 - 乙酰化寡聚物（M = RU和OS，P-P是二磷蛋白），以确定控制有机pi-Pi-jugugated系统中激发状态脱位的因素。 2）三胞胎激发态的性质将在一系列铂（II）封闭的Polyynes中进行探测，trans，trans-ar（p）2pt-（c = c）n-pt（p）2AR，以定义激发态性质与碳链长度之间的关系。 3）将研究一系列长链单分散的PT-乙酰基寡聚物，以确定三胞胎激子和负极分解的速率通过单个有机金属共轭链。 4）光物理和激子传输研究将扩展到由A）Pi结合的刚性刚性PT-乙酰基寡聚的自组装形成的明确定义的超分子聚集体，该凝胶蛋白限制了一个或多个长烷基链，或者是一个或多个长的烷基链，或B）甲状腺素二烯烯，可与金属复合物功能功能。这项工作的目的是确定聚集对三胞胎状态的特性的影响，并在定义明确的超分子骨料中研究三重态激子迁移。这项研究与具有巨大潜力有利于社会，经济和改善国家的国防能力的新兴技术直接相关。具体而言，这项工作重点的材料在光电设备中具有应用，例如可见和近红外光发射二极管（新的光源），光伏电池（光电电源转换），非线性光学，非线性光学器件（激光器保护和颜色转换）和传感器和传感器（化学 - 和Bio-and和Bio-Agent和Bio-Adectect）。该计划还可以作为本科和研究生的主要研究培训指导。佛罗里达大学的《光和物质外展计划》增强了该项目的更广泛影响，PI，研究生和本科生将通过该计划将相关的科学演示带到北佛罗里达州的中学。