Supramolecular-Surface Photochemistry: Exploring the Excited state Behavior of Confined Molecules Organized on Surfaces

超分子表面光化学：探索表面组织的限域分子的激发态行为

• 批准号: 1411458
• 负责人: Vaidhyanathan Ramamurthy
• 金额: $ 43.5万
• 依托单位: University of Miami
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1411458&HistoricalAwards=false
• 关键词: Supramolecular; Surface; Photochemistry; Exploring; Excited

Light induced chemical processes play important roles in biological systems (such as vision of animals and photosynthesis for the conversion of sunlight to chemical energy stored in plants) and have potential applications in the capture and conversion of light energy to other forms of energy in solar energy devices. The understanding of the fundamentals of light induced chemical processes will help towards efficient utilization of light for beneficial purposes. To this end, Prof. V. Ramamurthy of University of Miami aims to gain a fundamental understanding of the light induced energy and electron transfer processes of small molecules confined in molecular containers on different types of material surface. This interdisciplinary research project, which involves US and international collaborations, provides a unique environment for training graduate and undergraduate students on different aspects of photochemistry, supramolecular chemistry, and surface chemistry. In addition, Prof. Rammamurthy develops special general lectures to help students and young researchers recognize the important role of basic science in everyday life. In this project, supported by the Macromolecular, Supramolecular and Nanochemistry Program of the Division of Chemistry, Prof. V. Ramamurthy investigates the excited state behavior of supramolecular structures assembled on solid surfaces. The specific objectives of this project are: 1) to study photoinduced energy transfer between organic donor and acceptor molecules which are separated and encapsulated in cavitands aligned on passive surfaces (e.g., saponite clay, alpha-zirconium (IV) phosphate and layered double hydroxide); 2) to investigate photoinduced electron transfer across the cavitand wall between an encapsulated organic molecule (as donor) and TiO2 (as acceptor) on which the cavitand container is anchored; and 3) to explore the use of gold clusters and nanoparticles as electron transfer sensitizers in triggering photochemical reactions of small organic molecules encapsulated in cavitands attached to the gold clusters and nanoparticles.

光诱导的化学过程在生物系统中发挥着重要作用（例如动物的视觉和将阳光转化为植物中储存的化学能的光合作用），并且在太阳能设备中捕获光能并将其转化为其他形式的能量方面具有潜在的应用。 了解光诱导化学过程的基本原理将有助于有效利用光来达到有益的目的。 为此，迈阿密大学的V. Ramamurthy教授旨在对限制在不同类型材料表面的分子容器中的小分子的光诱导能量和电子转移过程有一个基本的了解。 这个跨学科研究项目涉及美国和国际合作，为在光化学、超分子化学和表面化学的不同方面培训研究生和本科生提供了独特的环境。 此外，Rammamurthy 教授还开设了特别的普通讲座，帮助学生和年轻研究人员认识基础科学在日常生活中的重要作用。 在该项目中，在化学系高分子、超分子和纳米化学项目的支持下，V. Ramamurthy 教授研究了在固体表面组装的超分子结构的激发态行为。 该项目的具体目标是：1）研究有机供体和受体分子之间的光致能量转移，这些分子被分离并封装在钝化表面（例如皂石粘土、α-磷酸锆（IV）和层状双氢氧化物）上排列的空配体中； 2) 研究封装的有机分子（作为供体）和固定空穴容器的 TiO2（作为受体）之间穿过空穴壁的光诱导电子转移； 3) 探索使用金簇和纳米颗粒作为电子转移敏化剂来触发封装在附着在金簇和纳米颗粒上的空配体中的有机小分子的光化学反应。