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.

该奖项属于高分子、超分子和纳米化学项目，授予加州大学伯克利分校的 Jeffrey R. Long 教授，涉及许多作为单分子磁体的复合物的合成和详细表征。该项目包括以下研究：(a) 具有高各向异性铼基结构单元的新型氰基桥配位簇和链化合物的合成和表征，重点是确定哪些因素有助于高磁各向异性势垒； (b) 将已知具有自旋交叉行为的铁(II)络合物掺入此类化合物中，可能产生光可切换单分子和单链磁体的第一个例子； (c) 合成高对称性、多核咪唑酯桥团簇，其中钒(II/III)或铁(II/III)混合价态通过双交换机制导致能量良好隔离的高自旋基态； (d) 具有严格轴对称性的镧系元素和锕系元素配合物的合成，这可以提供产生大弛豫势垒的手段； (e) 操纵选定的三角锥体铁(II)配合物的配体场，从而操纵零场分裂参数。总之，龙博士和他的团队将开发合成新型单分子磁体的总体策略，这些磁体有望揭示高密度信息存储和基于自旋的分子电子学潜在兴趣的新型磁行为。这项研究的影响包括合成技术的遗产、具有潜在技术重要性的新材料的创造，以及对博士后、研究生和本科生在无机材料的合成和表征方面的教育和培训。作为一项相关的教育活动，龙博士将继续领导在加州大学伯克利分校化学系创建材料化学专业。