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

在这项由化学系化学结构、动力学和机理B计划资助的项目中，密西西比大学化学和生物化学系的Jared DelCamp教授和Nathan Hammer教授正在开发具有有趣的光-物质相互作用的新型有机染料分子。这项研究的目标是设计能够吸收低能量光的有机染料，以实现更高性能的电子设备的设计，如夜视技术、红外相机、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作用系统。该项目依赖于利用有机、无机、材料和物理化学进行的跨学科研究。为了鼓励STEM的参与，计划向广大公众和少数族裔人数较少的学生群体开展外联活动。一年一度的暑期研究项目将STEM学生带入校园，进行与该奖项相关的独立研究。能够在金属氧化物界面进行界面电荷分离的近红外吸收有机染料是推动一些新兴技术发展的需要。金属氧化物结合的有机染料很少能吸收低能光子(800 Nm)，然后在高量子产率下进行电荷分离。这些区域的系统在实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体系，需要对基础物理有机化学进行研究。在这个项目中，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致电荷分离的更高量子产率，(3)用于低能光子吸收的双交叉共轭染料，以及(4)包含亲芳香族官能团的近红外吸收发色团。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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.