Syntheses and Structures of [n]Cyclophenacenes and Related Carbon Nanobelts

在这个由化学学部化学合成计划资助的项目中，西弗吉尼亚大学化学系的王坤强教授正在开发有效的合成路线，利用有机反应来构建碳纳米带，作为碳纳米管的重复带状片段。目前对碳纳米带的兴趣部分是由于它们有可能用作生长碳纳米管的模板，而碳纳米管在微电子和纳米技术中具有重要意义。与现有的经验方法相比，这种合成方法在生产具有均匀直径和碳六边形取向的碳纳米管方面具有潜在的优势，这两个因素对先进制造的应用至关重要。为每位参与本研究的研究生或本科生制定了个性化的教育和指导计划。培养训练有素的合成化学家增加了化学工业的人力资源。功能化碳纳米带是生长具有均匀直径和手性的碳纳米管的潜在模板。它们也被证明具有独特的尺寸依赖的光电和氧化还原特性。Diels-Alder反应被用来制备导致碳纳米带的大环化的关键前体。Diels-Alder反应具有高立体选择性和通用性，可以很容易地获得各种带状结构。具有新的结构特征和官能团的1,4-二烷基-1,3-丁二烯的合成途径被开发出来，用于与亲二烯试剂的环加成，从而使碳纳米带的主要组分易于组装。官能团也可以作为铰链，将两个功能化碳纳米带连接在一起，形成更好地模仿碳纳米管的结构。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

In this project, funded by the Chemical Synthesis Program of the Chemistry Division, Professor Kung K. Wang of the Department of Chemistry at West Virginia University is developing efficient synthetic routes using organic reactions for the construction of carbon nanobelts as repeating belt-like segments of carbon nanotubes. The current interest in carbon nanobelts is due, in part, to the possibility of using them as templates for growing carbon nanotubes which are of significant importance in microelectronics and nanotechnology. This synthetic approach offers the potential advantage over the existing empirical methods in producing carbon nanotubes with uniform diameter and orientation of the carbon hexagons, two factors of critical importance for applications in advanced manufacturing. Personalized educational and mentoring program is developed for each graduate or undergraduate student who participates in this research. Development of well-trained synthetic chemists adds to the human resources for the chemical industry. Functionalized carbon nanobelts are potential templates for growing carbon nanotubes of a uniform diameter and chirality. They have also been shown to exhibit unique size-dependent optoelectronic and redox properties. The Diels-Alder reactions are used to prepare key precursors for macrocyclization leading to carbon nanobelts. The high stereoselectivity and versatility of the Diels-Alder reaction could provide easy access to a variety of belt-like structures. Synthetic pathways to 1,4-diaryl-1,3-butadienes with new structural features and functional groups are developed for cycloaddition with dienophiles to allow for the easy assembly of major components of carbon nanobelts. The functional groups could also serve as hinges to connect two units of functionalized carbon nanobelts together to form structures that could better mimic those of carbon nanotubes.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.