Very High Spin Organic Polyradicals

合成并表征了一系列具有明显三维形状的高自旋多自由基分子。多自由基的形状是由位阻（树突状分子）或共价键网络（笼状分子）决定的。磁性分析将利用SQUID、NMR和ESR技术来完成。开发和研究由高自旋多自由基组成的分子固体，并论证制备超高自旋多自由基的可行性。这项研究将提供一个电子自旋排序作为距离和未成对电子数的函数的一般模型。这项来自有机动力学项目的资助支持了内布拉斯加州大学的Andrzej Rajca教授在合成和表征具有几个不成对电子的高自旋有机分子方面的工作。典型有机分子中的电子是成对的，因此没有磁性，而目标分子将成为新型有机磁体的原型构建块。这项研究将为在分子水平上为影响电子和通信领域的各种技术和科学应用生产磁体提供所需的基本信息。

A series of high spin polyradical molecules with distinct three-dimensional shapes will be synthesized and characterized. The polyradical shapes will be imposed by either steric hindrance (dendrimers) or covalent bond networks (cages). Magnetic analysis will be accomplished by utilizing SQUID, NMR, and ESR techniques. Molecular solids comprised of high spin polyradicals will be developed and investigated, and the feasibility of making ultra high spin polyradicals will be demonstrated. The investigation will provide a general model for electron spin ordering as a function of distance and number of unpaired electrons. %%% This grant from the Organic Dynamics Program supports the work of Professor Andrzej Rajca at the University of Nebraska on the synthesis and characterization of high spin organic molecules that possess several unpaired electrons. Electrons in typical organic molecules are paired and thus have no magnetic properties, whereas the target molecules will be prototype building blocks for novel organic magnets. This investigation should provide basic information required to produce magnets on a molecular level for a variety of technical and scientific applications impacting on the electronics and communications fields.