CAS: Photoinduced Interfacial Charge Transfers with Organic Sensitizers using Low Energy Photons and Fundamental Physical Organic Design Concepts

在这个由化学部化学结构、动力学和机理B项目资助的项目中，密西西比大学化学和生物化学系的Jared Delcamp教授和Nathan Hammer教授正在开发新型有机染料分子，这些分子表现出有趣的光-物质相互作用。这项研究的目标是设计能够吸收低能量光的有机染料，以实现高性能电子设备的设计，如夜视技术、红外摄像机、安全显示技术、太阳能电池（包括可与建筑物集成的透明电池）、太阳能电池和人工光合系统。该项目依赖于有机、无机、材料和物理化学的跨学科研究。为了鼓励STEM的参与，我们计划向公众和少数族裔学生群体开展外展活动。每年的夏季研究项目将STEM学生带到校园进行与该奖项相关的独立研究。能够在金属氧化物界面上进行界面电荷分离的近红外吸收有机染料是推动许多新兴技术的必要条件。金属氧化物结合的有机染料，吸收低能量光子（800纳米），随后进行电荷分离在高量子产量是罕见的。这些区域的系统在效用上常常受到激发态和电荷分离态寿命的限制。为了合理设计使用低能光子的系统，需要对基础物理有机化学进行研究。本项目在界面上研究了四种类型的系统：(1)电子转移到金属氧化物后具有离域电荷态的染料，(2)具有激发态芳香性的染料，用于延长激发态以促进界面光诱导电荷分离的高量子产率，(3)具有低能量光子吸收的双交叉共轭染料，以及(4)具有亲芳功能的近红外吸收发色团。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

In this project, funded by the Chemical Structure, Dynamics & Mechanisms B Program of the Chemistry Division, Professors Jared Delcamp and Nathan Hammer of the Department of Chemistry and Biochemistry at the University of Mississippi are developing new classes of organic dye molecules that exhibit interesting light-matter interactions. The goal of this research is to design organic dyes that absorb low-energy light to enable the design of higher-performing electronic devices such as night vision technologies, infrared cameras, secure display technologies, solar cells including transparent ones integrable with buildings, solar batteries, and artificial photosynthetic systems. This project relies on interdisciplinary research utilizing organic, inorganic, materials, and physical chemistry. To encourage STEM involvement, outreach activities to the general public and student groups with large populations of underrepresented minorities are planned. A yearly summer research program brings STEM students onto campus to conduct independent research related to this award. Near-infrared absorbing organic dyes capable of undergoing interfacial charge separation at metal oxide interfaces are needed to advance a number of emerging technologies. Metal oxide bound organic dyes that absorb low energy photons (800 nm) and subsequently undergo charge separation in high quantum yields are rare. Systems in these regions are often limited in utility by excited-state and charge separated state lifetimes. The study of fundamental physical organic chemistry is needed to enable the rational design of systems using low energy photons. In this project, four types of systems are studied at interfaces: (1) dyes with delocalized charge states after electron transfer to metal oxides, (2) dyes with excited-state aromaticity for prolonging excited states to promote higher quantum yields of interfacial photoinduced charge separation, (3) double cross-conjugated dyes for lower energy photon absorptions, and (4) Near-infrared absorbing chromophores incorporating proaromatic functionality.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.