Self-assembled organic nanotubes from cyclic ureas

环状脲自组装有机纳米管

• 批准号: 1305136
• 负责人: Linda Shimizu
• 金额: $ 39万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1305136&HistoricalAwards=false
• 关键词: Self; assembled; organic; nanotubes; cyclic

The Macromolecular, Supramolecular and Nanochemistry Program at the National Science Foundation supports the work of Professor Linda Shimizu of the University of South Carolina that investigates the utility of functional porous crystals to absorb, transport and organize guests and to facilitate their subsequent photoreactions. These porous crystals are made by the self-assembly of bis-urea macrocycles into columnar structures. The columns pack close together to give crystals with homogeneous channels with diameters of 1 nm or less. The mobility of the guest through cylinder like nanochannels is a function of the dimensions (size, shape) and interior properties (polarity) of the channel. The Shimizu group studies photoreactions and oxidations in these small spaces. These reactions provide controlled model systems to test the effects of confinement on reactions.Fundamental understanding of the processes of absorption, diffusion, and storage in tiny straw-like channels with diameters of 1 nm or less has practical application in separations and catalysis. Ultimately, a better understanding of a reaction mechanism aids in the development of safer, more environmentally friendly and economical reagents for organic synthesis. This research provides training for undergraduates and graduate students in organic and materials chemistry. In addition, this award supports the continuation of a chemical demonstration program that brings chemists into South Carolina K-12 classrooms to showcase the scientific method and to foster interest in chemistry and in the natural sciences.

美国国家科学基金会的大分子、超分子和纳米化学项目支持南卡罗莱纳大学的Linda Shimizu教授的工作，她研究了功能性多孔晶体在吸收、运输和组织客人以及促进他们随后的光反应方面的效用。这些多孔晶体是由双尿素大环自组装成柱状结构形成的。这些柱紧密地排列在一起，使晶体具有均匀的通道，直径为1纳米或更小。客体通过圆柱形纳米通道的移动性是通道尺寸（大小、形状）和内部特性（极性）的函数。Shimizu小组研究这些小空间中的光反应和氧化。这些反应提供了受控的模型系统来测试限制对反应的影响。对直径小于等于1nm的微小吸管状通道中的吸收、扩散和储存过程的基本理解，在分离和催化方面具有实际应用价值。最终，更好地了解反应机理有助于开发更安全、更环保和更经济的有机合成试剂。本研究为有机化学与材料化学的本科生和研究生提供训练。此外，该奖项支持化学示范项目的延续，该项目将化学家带入南卡罗来纳州K-12教室，展示科学方法，培养对化学和自然科学的兴趣。