Single Molecule Magnets

这个奖项在无机，生物无机和有机化学计划支持研究教授大卫N。亨德里克森更好地控制单分子磁体（SMM）的量子特性。 本研究将探讨在室温下，以溶液化学合成法所制备的具有明确结构的单分散奈米磁体，其磁化强度的量子隧穿现象。 将通过灵敏的电子顺磁共振方法、核磁共振（NMR）和磁力测量技术对SMM进行表征。本论文的主要研究内容包括：（1）合成新的自组装磁性分子，以调节控制磁性动力学性质的各种因素;（2）研究磁性共振量子隧穿（QTM）的机制;（3）研究分子间磁交换作用对QTM的影响;（4）研究磁性共振量子隧穿的机理。（4）研究SMM从具有相对大自旋（如S = 13）的分子到具有小自旋（如S = 4）的分子的性质如何变化;（5）详细检查半整数所表现出的自旋宇称效应（例如，S = 9/2、13/2等）自旋SMM;（6）制备和表征具有输运性质的新型SMM;（7）将SMM附着到功能化金属表面或聚合物上;（8）开发具有光子可及性的SMM;（9）制备掺杂S = 0反铁磁环和多核络合物的非补偿自旋SMM;以及（10）发现为什么某些Mn 12 SMM表现出具有其它Mn 12 SMM的一半激活能的磁化隧穿。单分子磁体为纳米级数据存储和其他应用提供了潜力。 这项研究旨在开发新型单分子磁体，并研究它们所呈现的新量子效应。 合作涉及三个不同国家的物理组和几个化学组，这将加强研究生和本科生的多样化群体的研究培训。

This award in the Inorganic, Bioinorganic and Organometallic Chemistry program supports research by Professor David N. Hendrickson to better control the quantum properties of single-molecule magnets (SMMs). The quantum tunneling of magnetization in monodisperse nanomagnets with well-defined structures prepared by chemical synthesis in solution at ambient temperatures will be investigated. The SMMs will be characterized by sensitive electron paramagnetic resonance methods, nuclear magnetic resonance (NMR) and magnetometry techniques. Goals of this research include: 1) synthesizing new SMMs in order to adjust the various factors controlling the nature of magnetization dynamics; (2) investigating the mechanism for the resonant quantum tunneling of magnetization (QTM); (3) pursuing the influence of intermolecular magnetic exchange interactions on QTM; (4) studying how the properties of SMMs change going from a molecule with a relatively large spin such as S = 13 to one with a small spin such as S = 4; (5) examining in detail spin parity effects exhibited by half-integer (e.g., S = 9/2, 13/2, etc.) spin SMMs; (6) preparing and characterizing new SMMs with transport properties; (7) attaching SMMs to functionalized metal surfaces or to polymers; (8) developing SMMs with photon accessibility; (9) preparing non-compensated spin SMMs doping S = 0 antiferromagnetic rings and polynuclear complexes; and (10) discovering why certain Mn12 SMMs exhibit magnetization tunneling with one-half the activation energy of other Mn12 SMMs. Single molecule magnets offer the potential for data storage on the nanoscale and other applications. This research is to develop new types of single molecule magnets and study the new quantum effects they present. Collaborations involve physics groups in three different countries and several chemistry groups, which will enhance the research training of a diverse group of graduate and undergraduate students.