Lattice Dynamics and Bistability of Electronically Labile Complexes

电子不稳定配合物的晶格动力学和双稳定性

• 批准号: 0095031
• 负责人: David Hendrickson
• 金额: $ 39.7万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-01 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0095031&HistoricalAwards=false
• 关键词: Lattice; Dynamics; Bistability; Electronically; Labile

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.

加州大学圣地亚哥分校的大卫亨德里克森得到了无机生物无机和有机化学项目的支持，继续研究电子不稳定复合物的晶格动力学和双稳态。研究的主要重点是多核Mn，Fe，V和Ni配合物，作为单分子磁体（SMM）。钴配合物的价态互变异构体也将被研究。在SMM中，磁性不是由分子之间的相互作用产生的，而是由每个分子都具有负磁各向异性的高自旋基态的情况产生的。研究的主要目标是：1）鉴定在较高温度下操作的SMM，2）研究共振磁隧穿的机制，3）阐明基态自旋的大小的影响，4）阐明十二锰配合物的异构性的影响，5）研究磁性抗衡离子的影响，6）制备半整数基态SMM，7）发现在表面上定向SMM的方法。另一个目标是确定钴的半醌络合物的相互转化是否涉及量子力学隧穿。在此期间，将建立合作，以设计和制造有用的微电子器件。单分子磁体（SMM）是分子纳米磁体。SMM被广泛认为在超微电子器件的开发中具有巨大的潜力。 日本和欧洲正在积极研究这一领域。该小组在先前NSF支持下进行的研究设定了高质量和生产力标准。这个实验室被列为世界上首屈一指的研究和教育中心的磁性化学。科学已经发展到这样一个地步，即开发特定的有用设备似乎是可行的。