Photophysics of Mono-Disperse Metal-Organic Oligomers

无机，生物无机和有机化学计划的这项资助支持了Kirk S博士对金属有机π共轭聚合物光学性质的研究。佛罗里达大学化学系的尚泽说。 几个同源系列的单分散，金属-有机π共轭低聚物的物理性质将被确定为更高分子量的聚合物对应物的模型。 待研究的特定化合物是单分散的亚苯基乙炔基和亚苯基乙烯基型低聚物，其含有可以结合多种过渡金属离子，特别是钌（I）和钌（II）的联吡啶单元。 在这些化合物中观察到了整个低聚物上离域的低位金属-配体电荷转移（MLCT）激发态。 除了金属中心对光学性质的影响外，还将研究低聚物拓扑结构、共轭长度和带隙对MLCT激发态性质的影响。 一些铂乙炔低聚物也将进行研究。 光物理研究将利用吸收、光致发光、光诱导吸收、瞬态FT-IR和FT-EPR光谱以及光声量热法。金属有机聚合物表现出金属和有机组分预期的性质的组合。 由于这个原因，它们有可能用于需要电致变色或光致变色活性的电子器件或用于金属离子的特异性检测。 参与本项目的研究生和本科生将获得许多合成技术和使用复杂仪器的经验。

This grant in the Inorganic, Bioinorganic, and Organometallic Chemistry Program supports research on the optical properties of metal-organic pi-conjugated polymers by Dr. Kirk S. Schanze of the Department of Chemistry, University of Florida. The photophysical properties of several homologous series of mono-disperse, metal-organic pi-conjugated oligomers will be determined as models for higher molecular weight polymeric counterparts. The specifc compounds to be studied are mono-disperse phenyleneethynylene and phenylenevinylene type oligomers that contain bipyridine units that can bind a variety of transition metal ions, particularly rhenium (I) and ruthenium (II). Low-lying metal to ligand charge transfer (MLCT) excited states delocalized over the entire oligomer are observed in these compounds. In addition to the impact of the metal center on optical properties, the effects of oligomer topology, conjugation length and bandgap on the properties of the MLCT excited states will be investigated. Some platinum-acetylide oligomers will also be studied. Photophysical investigation will utilize absorption, photoluminescence, photoinduced absorption, transient FT-IR and FT-EPR spectroscopies and photoacoustic calorimetry.Metal-organic polymers exhibit properties that are a combination of those expected for the metal and organic components. For this reason, they have potential for use in electronic devices that require electrochromism or photorefractivity or in specific detection of metal ions. Graduate and undergraduate students involved in this project will gain experience in many synthetic techniques and use of sophisticated instrumentation.