Very High-Spin Polyradicals and Chiral pi-Conjugated Systems

有机化学和高分子化学项目继续支持内布拉斯加州大学林肯分校化学系Andrzej Rajca教授的工作。这一研究将拓展PI对高自旋多自由基和手性共轭PI体系的研究。在多自由基方面，PI将合成具有多个未配对电子的分子，预计这些分子在环境温度下是稳定的。通过使用氮氧化物作为电子自旋的载体，稳定性将得到提高。这些材料将具有高自旋电子基态，表现出强烈的铁磁耦合，使它们有可能作为有机磁体发挥作用。在手性共轭体系方面，PI将合成具有7个以上稠合芳环的对映体螺烯，以了解强手性有机材料的合理设计原理，这些多学科的研究将为开发轻质有机磁体和具有新的光学和电子性能的手性材料提供重要的基础信息。此外，该研究还将为学生提供物理有机化学、有机合成、固态化学和磁学方面的多样化培训。

With this renewal award, the Organic and Macromolecular Chemistry Program continues its support of the work of Professor Andrzej Rajca of the Department of Chemistry at the University of Nebraska, Lincoln, NE. The research will extend the PI's research on high-spin polyradicals and chiral conjugated pi-systems. In the area of polyradicals, the PI will synthesize molecules having multiple unpaired electrons that are expected to be stable at ambient temperatures. Stability will be enhanced through the use of nitroxides as carriers of electron spin. These will be materials with high-spin electronic ground states that exhibit strong ferromagnetic coupling, giving them the potential to function as organic magnets. In the area of chiral conjugated systems, the PI will synthesize enantiopure helicenes with more than seven fused aromatic rings in order to understand the principles governing the rational design of strongly chiral organic materials.These multidisciplinary studies are expected to provide important fundamental information that will contribute to the development of lightweight organic magnets and of chiral materials with novel optical and electronic properties. In addition, the research will provide students with diverse training in physical organic chemistry, organic synthesis, solid-state chemistry, and magnetism.