Synthesis and Characterization of Organic-based Molecular Magnetic Materials

该奖项授予马萨诸塞大学阿姆赫斯特分校的Paul Lahti教授，由化学学部的先进材料和加工项目提供支持。研究的主题是具有多个不成对电子作为磁性材料的分子有机组件的合成、表征和性能。结构改变将在聚合物阵列和固态晶体阵列中发展，以优化未配对电子自旋之间的相互作用。具体地说，将制造最大化平面性的聚合自由基系统，研究通过氢键组合相互作用的稳定自由基系统，以及研究通过金属螯合组合的自由基系统。所使用的稳定自由基类型将是硝基氮氧化物、亚硝基氮氧化物和苯硝基氮氧化物。表征将通过元素分析，ESR， NMR和GC-MS。磁性测量将通过已建立的合作进行。这项高度跨学科的研究解决了基于电子自旋远距离组装的有机铁磁性的基本机制。有机合成、稳定自由基表征和磁性测量相结合，将为学生在基础兴趣和技术相关问题方面的培训提供理想的环境。此外，许多前体和自由基所涉及的物种可能具有药用和药理活性，并将用于生物筛选。

This award to Prof. Paul Lahti at the University of Massachusetts-Amherst is supported by the Advanced Materials and Processing Program in the Chemistry Division. The theme of the research is the synthesis, characterization and performance of molecular organic assemblies with multiple unpaired electrons as magnetic materials. Structural alterations will be developed in both polymeric arrays and solid state crystalline arrays which optimize interactions among the unpaired electron spins. Specifically, polymeric free radical systems will be made which maximize planarity, stable free radicals systems which interact through hydrogen bonded assemblies will be investigated, and free radical systems that assemble through metal chelation will be studied. The stable free radical types employed will be nitronyl nitroxides, iminoyl nitroxides and benzonitroyl nitroxides. Characterization will be by elemental analysis, ESR, NMR and GC-MS. Magnetic performance measurements will be carried out through established collaborations. This highly interdisciplinary research addresses fundamental mechanisms of organic ferromagnetism based on long range assembly of electronic spins. The combination of organic synthesis, stable free radical characterization, and magnetic performance measurements will provide an ideal environment for the training of students in problems of both fundamental interest and technological relevance. Additionally, many of the precursor and free radical species involved may have medicinal and pharmacological activity and will be made available for biological screening.