A Coordination Chemistry Approach to the Synthesis of Single-Molecule Magnets

合成单分子磁体的配位化学方法

• 批准号: 1111900
• 负责人: Jeffrey Long
• 金额: $ 45万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1111900&HistoricalAwards=false
• 关键词: Coordination; Chemistry; Approach; Synthesis; Single

This award in the Macromolecular, Supramolecular & Nanochemistry Program to Professor Jeffrey R. Long of the University of California, Berkeley, involves the synthesis and detailed characterization of a number of complexes as single-molecule magnets. The project consists of the following studies: (a) synthesis and characterization of new cyano-bridged coordination clusters and chain compounds featuring high-anisotropy rhenium-based building units, with emphasis on establishing what factors contribute to high magnetic anisotropy barriers; (b) incorporation of iron(II) complexes known to exhibit spin crossover behavior into such compounds, possibly leading to the first examples of photoswitchable single-molecule and single-chain magnets; (c) synthesis of high-symmetry, multinuclear imidazolate-bridged clusters in which vanadium(II/III) or iron(II/III) mixed valence leads to an energetically well-isolated high-spin ground state via a double exchange mechanism; (d) synthesis of lanthanide and actinide complexes with rigorous axial symmetry, which could provide a means of generating a large relaxation barrier; (e) manipulation of the ligand field, and consequently the zero-field splitting parameters, of selected trigonal pyramidal iron(II) complexes. In sum, Dr. Long and his group will develop general strategies for the synthesis of new single-molecule magnets that are expected to reveal new types of magnetic behavior of potential interest for high-density information storage and spin-based molecular electronics.The broader impacts of this research include a legacy of synthetic techniques, the creation of new materials of potential technological importance, and the education and training of postdoctoral, graduate, and undergraduate students in the synthesis and characterization of inorganic materials. As a related educational activity, Dr. Long will continue to lead an effort to create a materials chemistry major within the Department of Chemistry at UC Berkeley.

该奖项在加利福尼亚大学伯克利分校的杰弗里·R·朗（Jeffrey R.该项目由以下研究组成：（a）新的氰基桥式协调簇和具有高矛盾基于基于Rhenium rhenium的建筑单元的综合和表征，重点是确定哪些因素有助于高磁性各向异性障碍物； （b）将已知的旋转跨界行为的铁（II）络合物掺入到此类化合物中，可能导致了可拍摄的单分子和单链磁铁的第一个例子； （c）合成高对称性，多核咪唑酸盐桥式簇，其中钒（II/III）或铁（II/III）混合价可通过双重交换机制导致能量良好的高速固定基态； （d）用严格的轴向对称性合成灯笼和肌动剂复合物，这可以提供一种产生较大弛豫屏障的方法； （e）对选定三角锥铁（II）配合物的配体场的操纵，以及因此的零场分裂参数。总而言之，Long博士及其小组将制定一般策略来综合新的单分子磁铁，这些磁铁有望揭示新型的潜在兴趣的磁性行为，用于高密度信息存储和基于旋转的分子电子电子学的潜在兴趣。无机材料。作为一项相关的教育活动，朗博士将继续努力在加州大学伯克利分校化学系中创建材料化学专业的专业。