Lattice Dynamics and Bistability of Electronically Labile Complexes

加州大学圣地亚哥分校的David Hendrickson在无机生物无机和有机金属化学项目的支持下，继续研究电子不稳定复合物的晶格动力学和双稳定性。研究的重点是作为单分子磁体（SMMs）的多核Mn， Fe， V和Ni配合物。钴配合物的价互变异构体也将被研究。在smm中，磁性不是来自分子之间的相互作用，而是来自每个分子具有负磁各向同性的高自旋基态的情况。本研究的主要目标是：1)确定在高温下工作的smm， 2)研究共振磁隧穿机制，3)阐明基态自旋大小的影响，4)阐明十二锰配合物异构的影响，5)研究磁性反离子的影响，6)制备半整数基态smm， 7)发现smm在表面定向的方法。另一个目标是确定钴的半醌配合物的相互转化是否涉及量子力学隧道。在此资助期间，将建立合作，以设计和制造有用的微电子设备。单分子磁体（SMMs）是分子纳米磁体。smm被广泛认为在超微电子器件的发展中具有巨大的潜力。日本和欧洲正在积极研究这一领域。在NSF之前的支持下，这个小组所做的研究已经树立了高质量和生产力的标准。这个实验室被评为世界上首屈一指的磁化学研究和教育中心。科学已经进步到这样的地步，开发出特定的有用设备似乎是可行的。

David Hendrickson of the University of California, San Diego is supported by the Inorganic Bioinorganic and Organometallic Chemistry Program in continued research on lattice dynamics and bistability of electronically labile complexes. The main focus of the research is on polynuclear Mn, Fe, V, and Ni complexes that function as single molecule magnets (SMMs). Valence tautomers of cobalt complexes will also be investigated. In SMMs, magnetism does not arise from interactions between molecules but from the circumstance that each individual molecule has a high-spin ground state with negative magnetoanisometry. The major goals of the research are: 1) to identify SMMs that operate at higher temperatures, 2) investigate the mechanism of resonant magnetism tunneling, 3) clarify the influence of the magnitude of ground state spin, 4) elucidate the influence of isomerism of duodecamanganese complexes, 5) investigate the influence of magnetic counterions, 6) prepare half-integer ground state SMMs, 7) discover ways to orient SMMs on a surface. An additional goal is to determine whether interconversion of semiquinone complexes of cobalt involve quantum mechanical tunneling. During the period of this grant, collaborations will be established in order to design and fabricate useful microelectronic devices. Single molecule magnets (SMMs) are molecular nanomagnets. SMMs are widely recognized as having great potential in the development of devices useful in ultra-micro electronics. This field is being actively investigated in Japan and Europe. Research produced by this group under prior NSF support has set a high standard of quality and productivity. This laboratory is ranked as the world's premier center of research and education in magnetochemistry. The science has progressed to the point that development of specific useful devices seems feasible.