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.

国家科学基金会的大分子，超分子和纳米化学计划支持南卡罗来纳大学的琳达·辛祖（Linda Shimizu）的工作，该教授调查了功能性多孔晶体的实用性，以吸收，运输和组织客人并组织并促进其后续光疗法。这些多孔晶体是由双卵形大环的自组装成柱状结构的。 柱子封闭在一起，以均匀的通道为晶体，直径为1 nm或更小。 客人通过圆柱体（如纳米通道）的迁移率是通道的尺寸（大小，形状）和内部特性（极性）的函数。 Shimizu组研究了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，以测试限制对反应的影响。对吸收，扩散和储存过程的汇总理解在细小的稻草样通道中，直径为1 nm或更少，在分离和催化中具有实际应用。最终，对反应机制的更好理解有助于开发有机合成的更安全，更环保和经济的试剂。这项研究为有机和材料化学的本科生和研究生提供了培训。此外，该奖项还支持一个化学演示计划的延续，该计划将化学家带入南卡罗来纳州K-12教室，以展示科学方法并促进对化学和自然科学的兴趣。