2nd Generation Pyrylogen and 1st Generation Viologen Electron Transfer Catalysts

有了这个奖项，化学结构、动力学和机制项目支持怀俄明大学爱德华·l·克莱南教授的工作。本课题将重点研究第二代定向光捕获分子的合成与表征。第一代这些独特材料的高电荷框架通过抑制能量浪费来提高其作为光致电子转移（PET）敏化剂的效率。将合成的第二代敏化剂将具有提高其水解稳定性的结构特征。他们还将与一系列不同的电荷平衡反离子合作，以探索反离子对反应效率的影响。这些新材料的光物理和电化学特性将被研究，并将确定它们在几个PET反应中增加每个光子形成的产物分子数量的能力。这些新的敏化剂通过抑制链终止步骤来增加原型电子转移链反应链长的能力也将被检验。这些新的敏化剂的价值也将在几个综合有用的转换中得到证明。这些新的敏化剂将为更绿色、更环保、效率更高的光诱导电子转移反应提供途径。这些反应具有深远的影响，能够产生用其他方法难以或不可能获得的新材料。此外，这些新的敏化剂本身就是令人着迷的新材料，在分子开关、场效应晶体管、有机光伏器件和有机发光二极管（oled）等各种器件中具有潜在的用途。最后，参与这项计画的学生将会在广泛的计算和实验工具上获得宝贵的经验。

With this award, the Chemical Structure, Dynamics and Mechanisms Program supports the work of Professor Edward L. Clennan at the University of Wyoming. The research will focus on the synthesis and characterization of 2nd generation dicationic light harvesting molecules. The highly charged frameworks of the 1st generation of these unique materials were designed to improve their efficiency as photoinduced electron transfer (PET) sensitizers by inhibiting energy wasting return electron transfer. The 2nd generation sensitizers that will be synthesized will have structural features that will improve their hydrolytic stabilities. They will also be partnered with a series of different charge balancing counterions in order to probe the counterion effect on reaction efficiencies. The photophysical and electrochemical characteristics of these new materials will be investigated and their abilities to increase the number of product molecules formed per photon used in several PET reactions will be determined. The ability of these new sensitizers to increase the chain length of a prototypical electron transfer chain reaction by inhibiting the chain termination step will also be examined. The value of these new sensitizers will also be demonstrated in several synthetically useful transformations.These new sensitizers will provide access to greener, more environmentally friendly, higher efficiency photoinduced electron transfer reactions. These reactions have the far-reaching impact of being able to produce new materials that are difficult or impossible to obtain using other methods. In addition, these new sensitizers are themselves fascinating new materials that have potential uses in devices as diverse as molecular switches, field-effect transistors, organic photovoltaic devices, and organic light emitting diodes (OLEDs). Finally, the students who will work on this project will obtain valuable experience in a wide range of computational and experimental tools.