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.

该奖项由无机，生物无机和有机化学计划支持柯克教授的研究。佛罗里达大学的尚泽继续研究“共轭有机低聚物和聚集体中的光物理、激子和电荷传输”。“激发态性质沿着与电荷和激子输运含金属的π共轭低聚物和超分子组件将被检查。总体目标是发展一个清晰的理解激发态离域，能量和电荷传输内孤立的单链的有机金属π共轭系统（分子线）和超分子聚集体产生的π共轭单体的自组装。将研究几种分子系统。1)为了确定控制有机金属π共轭体系中激发态离域的因素，我们研究了一类含有反式（Ar-C=C-）2 M（P-P）2（M = Ru和Os，P-P为双膦）重复单元的金属乙炔化物低聚物。2)三重激发态的性质将在一系列铂（II）封端的多炔类型，反式，反式-Ar（P）2 Pt-（C=C）n-Pt（P）2Ar中进行探测，以确定激发态性质和碳链长度之间的关系。3)一系列的长链，单分散的Pt-乙炔化物低聚物将被研究，以确定通过单个有机金属共轭链的三重态激子和负极化子传输率。4)光物理和激子输运研究将扩展到定义明确的超分子聚集体形成的自组装a）π共轭刚性棒Pt-乙炔低聚物与一个或多个长的烷基链，或B）hexabenzoconenes功能化与金属络合物发色团。本研究的目的是确定聚集对三重态性质的影响，并研究三重态激子在定义明确的超分子聚集体中的迁移。这项研究与具有巨大潜力的新兴技术直接相关，这些技术对社会、经济和提高国家的国防能力具有巨大的潜力。具体而言，这项工作的重点材料在光电器件中有应用，如可见光和近红外发光二极管（新型光源），光伏电池（光到电能转换），非线性光学（激光保护和颜色偏移）和传感器（化学和生物制剂检测）。该计划还作为本科生和研究生的主要研究培训渠道。这个项目的更广泛的影响是由光和物质外展计划在佛罗里达，通过PI，研究生和本科生将带来光化学相关的科学示范，在北佛罗里达地区的中学大学增强。