Donor-Acceptor Interactions and Their Relationship to Molecular Electronics and Excited State Processes.

供体-受体相互作用及其与分子电子和激发态过程的关系。

• 批准号: 1565930
• 负责人: Martin Kirk
• 金额: $ 43.5万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1565930&HistoricalAwards=false
• 关键词: Donor; Acceptor; Interactions; Their; Relationship

In this project funded by the Chemical Structure, Dynamics and Mechanism B Program of the Chemistry Division, Professor Martin L. Kirk of the Department of Chemistry and Chemical Biology at the University of New Mexico is studying how electronically active molecules can be used in molecular electronics and other molecule-based technologies. Prof. Kirk is studying (1) how electrons flow through the molecules and can be controlled, (2) how the structures of the molecules affect their absorption of light, and (3) the nature of the molecules' excited states after light has been absorbed. The research is interdisciplinary and positioned at the interface of organic, inorganic, and physical chemistry and is providing enhanced opportunities for the education and training of next generation scientists. Professor Kirk is involved in teaching, training and mentoring student researchers, including those from underrepresented groups. He is also participating in outreach projects in New Mexico including those associated with the Albuquerque Explora! Museum and NanoDays.The project goals focus on using creatively designed magnetic exchange coupled Donor-Bridge-Acceptor biradical systems to explore (1) molecular quantum interference and molecular rectification, (2) anisotropic covalency induced spin orbit coupling contributions to excited state lifetimes, and (3) how excited state magnetic exchange interactions affect magneto-optical activity, spin polarization, and excited state relaxation pathways. The project utilizes a combined spectroscopic approach augmented by theory and computations to address these problems. Regarding molecular electron transport phenomena, Donor-Bridge-Acceptor electronic coupling in the context of molecular conductance is studied in order to test recent theoretical hypotheses and compare results to those that have been obtained under device conditions. This work could directly impact the molecular electronics field. Modulation of spin orbit coupling through anisotropic covalency impacts the ability to control relaxation rates and pathways in photoexcited states. Work using magnetic circular dichroism and transient spectroscopies reveals the nature of complex multi-spin excited state magnetic exchange interactions that derive from photoexcitation. The research contributes to a greater understanding of excited state magnetism, exciton-polaron coupling, and solar energy conversion. The project advances knowledge and understanding in the field of donor-acceptor interactions and contribute substantially to the understanding of molecular electronics, atom level control of excited state lifetimes, and spin effects on excited state processes.

新墨西哥大学化学系和化学生物学系的Martin L. Kirk教授在化学结构、动力学和机理B项目资助的这个项目中，正在研究如何将电子活性分子用于分子电子学和其他基于分子的技术。柯克教授正在研究(1)电子如何在分子中流动并如何被控制，(2)分子的结构如何影响它们对光的吸收，以及(3)光被吸收后分子激发态的性质。该研究是跨学科的，定位于有机，无机和物理化学的界面，并为下一代科学家的教育和培训提供了更多的机会。柯克教授参与教学、培训和指导学生研究人员，包括那些来自代表性不足群体的研究人员。他还参与了新墨西哥州的外展项目，包括与阿尔伯克基探索！博物馆和纳米日。该项目的目标是利用创造性设计的磁交换耦合供体-桥-受体双基体系来探索(1)分子量子干涉和分子整流，(2)各向异性共价诱导的自旋轨道耦合对激发态寿命的贡献，以及(3)激发态磁交换相互作用如何影响磁光活性、自旋极化和激发态弛豫途径。该项目利用理论和计算相结合的光谱方法来解决这些问题。关于分子电子传递现象，研究了分子电导背景下的施主-桥-受体电子耦合，以检验最近的理论假设，并将结果与在器件条件下获得的结果进行比较。这项工作将直接影响分子电子学领域。通过各向异性共价调制自旋轨道耦合影响光激发态弛豫速率和路径的控制能力。利用磁圆二色性和瞬态光谱的工作揭示了由光激发产生的复杂的多自旋激发态磁交换相互作用的本质。该研究有助于更好地理解激发态磁，激子-极化子耦合和太阳能转换。该项目推进了供体-受体相互作用领域的知识和理解，并对分子电子学，激发态寿命的原子水平控制以及激发态过程的自旋效应的理解做出了重大贡献。