Nanohoops as Modular Building Blocks to Molecular Cylinders and Machines

纳米箍作为分子筒和机器的模块化构建块

• 批准号: 1808791
• 负责人: Ramesh Jasti
• 金额: $ 24万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1808791&HistoricalAwards=false
• 关键词: Nanohoops; Modular; Building; Blocks; Molecular

Professor Ramesh Jasti at the University of Oregon is supported by the Macromolecular, Supramolecular, and Nanochemistry (MSN) Program of the Division of Chemistry to develop general methods to use nanohoop molecules as building blocks to self-assemble into precise nanoscale materials with controlled shape and function. Two forms of structures are envisioned: nanotubes and interlocked structures. Novel synthetic approaches are explored to achieve these objectives. The desired products are expected to have structural stability and unique size-dependent optoelectronic properties. The products are rationally designed to perform specific functions in gas adsorption, filtration, mass transport, and molecular switching and sensing. Nanotubes with controlled geometry and diameter are used to prepare one-dimensional materials from fullerenes (soccer-like) carbon-based molecules. Students involved in the project are trained in an interdisciplinary environment and acquire experience in organic synthesis, supramolecular chemistry, and nanoscience. A partnership with the University of Oregon Summer Science Program provides hands-on science experience to groups of students who are traditionally underrepresented in the state of Oregon. The assembly of molecular building blocks into precise nanoscale materials with novel function is a grand challenge at the interfaces of materials science, supramolecular chemistry, and synthesis. While synthetic approaches for the preparation of nanohoops have been developed in the last decade, the self-assembly of these nanohoops into nanoscale materials with controlled shape and function is relatively unexplored. In the first aim of this project, the Jasti research team is exploring weak aryl fluorine interactions as means to guide the self-assembly of carbon nanohoops into noncovalent nanotubes. The nanotubes are used to self-assemble fullerenes into 1D channels, which can then undergo a polymerization reaction to lead to a host of new 1D fullerene nanomaterials. In the second aim of the project, the Jasti group is exploring nitrogen-doped nanohoop analogues and metal-coordination strategies to prepare catenane structures, which would represent simple versions of molecular machines. The Jasti group is probing these new catenane structures for novel properties such as optoelectronic communication through the mechanical bond or ultra-low friction motion on the nanoscale.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.

俄勒冈大学的Ramesh Jasti教授得到了化学系大分子、超分子和纳米化学(MSN)计划的支持，开发了利用纳米环分子作为构建块自组装成形状和功能可控的精确纳米材料的一般方法。设想了两种形式的结构：纳米管和互锁结构。为了实现这些目标，人们探索了新的综合方法。期望得到的产品具有结构稳定性和独特的尺寸依赖的光电性能。这些产品经过合理设计，可以在气体吸附、过滤、质量传输以及分子开关和传感方面执行特定的功能。具有可控几何形状和直径的纳米管被用来从富勒烯(足球状)碳基分子制备一维材料。参与该项目的学生在跨学科环境中接受培训，并获得有机合成、超分子化学和纳米科学方面的经验。与俄勒冈大学暑期科学项目合作，为俄勒冈州传统上代表性不足的学生群体提供实践科学体验。将分子构件组装成具有新功能的精密纳米材料是材料科学、超分子化学和合成领域的一项重大挑战。虽然在过去的十年里已经开发了制备纳米环的合成方法，但将这些纳米环自组装成具有可控形状和功能的纳米材料的研究相对较少。在该项目的第一个目标中，JASTI研究小组正在探索微弱的芳基氟相互作用，以此作为引导碳纳米环自组装成非共价纳米管的手段。这些纳米管被用来将富勒烯自组装成一维通道，然后进行聚合反应，得到一系列新的一维富勒烯纳米材料。在该项目的第二个目标中，Jasti小组正在探索掺氮纳米环类似物和金属配位策略，以制备连环结构，这将代表分子机器的简单版本。JASTI团队正在探索这些新的链环结构，以获得新的性能，如通过机械键或纳米尺度上的超低摩擦运动进行光电通信。这一奖项反映了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。

项目成果

Precision Nanotube Mimics via Self-Assembly of Programmed Carbon Nanohoops

通过编程碳纳米环的自组装来模拟精密纳米管

• DOI: 10.1021/acs.joc.9b02340
• 发表时间: 2019
• 期刊: The Journal of Organic Chemistry
• 作者: Van Raden, Jeff M.;Leonhardt, Erik J.;Zakharov, Lev N.;Pérez-Guardiola, A.;Pérez-Jiménez, A. J.;Marshall, Checkers R.;Brozek, Carl K.;Sancho-García, J. C.;Jasti, Ramesh
• 通讯作者: Jasti, Ramesh

A Bottom-Up Approach to Solution-Processed, Atomically Precise Graphitic Cylinders on Graphite

• DOI: 10.1021/acs.nanolett.8b03979
• 发表时间: 2018-12-01
• 期刊: NANO LETTERS
• 影响因子: 10.8
• 作者: Leonhardt, Erik J.;Van Raden, Jeff M.;Jasti, Ramesh
• 通讯作者: Jasti, Ramesh