Porphyrin monolayers as platforms for the supramolecular organization of fullerenes at interfaces

卟啉单层作为富勒烯界面超分子组织的平台

• 批准号: 1611033
• 负责人: Michael Hopkins
• 金额: $ 43.5万
• 依托单位: University of Chicago
• 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: 2016-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1611033&HistoricalAwards=false
• 关键词: Porphyrin; monolayers; platforms; supramolecular; organization

The Macromolecular, Supramolecular and Nanochemistry Program of the Chemistry Division supports the project 'Porphyrin Monolayers as Platforms for the Supramolecular Organization of Fullerenes at Interfaces' by Professor Michael D. Hopkins, a faculty member in the Department of Chemistry at the University of Chicago. Fullerenes are molecules comprised of a specific number of carbon atoms (i.e., 60, 70, 84, etc.) that are widely studied for their potential technological applications, such as in electronics and solar energy conversion. The goal of this project is to develop a general method for creating specific patterns of fullerenes on flat surfaces, which will allow their technologically relevant properties to be controlled and provide a means to connect these nanometer-scale materials to conventional- scale electronics. The project provides interdisciplinary training for graduate students at the intersection of chemical synthesis, surface science, and materials science. Undergraduate students are also routinely involved in research projects in the PI's laboratory. Professor Hopkins is involved in organizing an outreach clearinghouse for doctoral students in the physical sciences at the university that will connect them with STEM-focused broader-impacts activities. An impediment to the development of technological applications of fullerenes is the lack of general methods for spatially organizing them into arrays with controllable patterns and dimensions at an addressable interface. This project investigates whether 5-coordinate gallium-porphyrin monolayers on highly oriented pyrolytic graphite will template the self- assembly of fullerenes into organized arrays at the interface. Porphyrins containing axial ligands that coordinate fullerenes via noncovalent interactions (e.g., polycyclic aromatics) are synthesized, and their surface chemistry in the absence and presence of fullerenes (especially C60) are investigated via scanning-probe microscopy. These studies aim to elucidate the fundamental relationships between fullerene patterning and: 1) the electronic and structural characteristics of the axial ligands; 2) the lattice dimensions and steric properties of the underlying porphyrin monolayers; and 3) the presence of capping porphyrins that could encapsulate the particles. These relationships will allow elucidation of design principles for this class of materials. The PI also leads the continued development of an internal portal that has proven successful in connecting physical-sciences graduate students with K-12 educational outreach opportunities in surrounding neighborhoods.

化学系的大分子、超分子和纳米化学项目支持Michael D.芝加哥大学化学系教员霍普金斯说。 富勒烯是由特定数目的碳原子组成的分子（即，60、70、84等）它们因其潜在的技术应用而被广泛研究，例如在电子和太阳能转换方面。该项目的目标是开发一种在平坦表面上创建特定富勒烯图案的通用方法，这将使其技术相关属性得到控制，并提供一种将这些纳米级材料连接到传统电子产品的方法。该项目为研究生提供化学合成，表面科学和材料科学交叉的跨学科培训。本科生也经常参与PI实验室的研究项目。教授霍普金斯参与组织在物理科学博士生在大学，将他们与STEM为重点的更广泛的影响活动连接外展交流中心。富勒烯技术应用发展的一个障碍是缺乏在可寻址界面上将它们空间组织成具有可控图案和尺寸的阵列的通用方法。本计画探讨在高定向热解石墨上的五配位镓卟啉单分子膜是否会将富勒烯自组装成有组织的阵列。含有通过非共价相互作用与富勒烯配位的轴向配体的卟啉（例如，多环芳香族化合物）的合成，并通过扫描探针显微镜研究它们的表面化学在富勒烯（特别是C60）的存在和不存在下。这些研究旨在阐明富勒烯图案化与以下因素之间的基本关系：1）轴向配体的电子和结构特征; 2）底层卟啉单层的晶格尺寸和空间性质;以及3）可以封装颗粒的帽状卟啉的存在。这些关系将允许阐明这类材料的设计原理。PI还领导了一个内部门户网站的持续发展，该门户网站已被证明成功地将物理科学研究生与周边社区的K-12教育推广机会联系起来。