Lattice Dynamics and Bistability of Electronically Labile Complexes

这个无机、生物无机和有机金属化学项目的奖项支持加州大学圣地亚哥分校化学系的David N. Hendrickson博士关于含金属固体中的电子效应的研究。将对具有两个或两个以上能量接近的电子态的过渡金属配合物进行详细的研究。对于振动模式与电子模式紧密耦合的化合物，晶格参数的变化，如由溶剂或反离子修饰引起的变化，可导致自旋交叉或相变，以响应光或其他外部参数的变化。该项目的主要目标是验证和表征分子物种的磁双稳定性，特别是十二核锰化合物。光学敏感的铁配合物和电子敏感的钴配合物的研究也将继续进行。这项研究的长期目标是开发用于电子电路和设备的分子或分子集合。随着电、磁、光或热的变化而改变自旋、电子数或磁性质的纳米级器件可能对开关或信息存储有用。在这项研究中，将测试含有少量金属原子的化合物对外部物理刺激反应的敏感性和特异性。目前已知的分子中磁场随外部磁场变化而变化的例子不多，因此本研究可能开辟一个新的研究领域。

This award in the Inorganic, Bioinorganic, and Organometallic Chemistry Program supports research by Dr. David N. Hendrickson of the Chemistry Department, University of California at San Diego, on electronic effects in metal-containing solids. Detailed studies will be carried out on transition metal complexes that have two or more electronic states which are close in energy. For compounds in which vibrational modes are closely coupled with electronic modes, changes in crystal lattice parameters such as those caused by modifying solvent or counterions can result in spin-crossover or phase transitions in response to changes in light or other external parameters. The primary goal of this project is to verify and characterize magnetic bistability in a molecular species, specifically a dodecanuclear manganese compound. Investigation of optically sensitive iron complexes and electronically sensitive cobalt complexes will also continue. The long-term goal of this research is to develop molecules or collections of molecules for use in electronic circuits and devices. Nanoscale devices which change spin, number of electrons, or magnetic properties in response to electric, magnetic, optical, or thermal changes may be useful for switches or information storage. In this research, compounds containing a small number of metal atoms will be tested for sensitivity and specificity of response to external physical stimuli. Only a few examples of molecules in which the magnetic field changes in response to changes in external magnetic field are known, so this research may open a new area of investigation.