Synthesis and Magnetic Investigations of New My-Carbamato-Metal Complexes and of Derived My-OH Compounds Using Directing Ligands

使用定向配体合成和磁性研究新型 My-Carbamato-金属配合物和衍生的 My-OH 化合物

• 批准号: 5369261
• 负责人: Professor Dr. Mario Ruben
• 金额: --
• 依托单位: Institut für Nanotechnologie (INT)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2003-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5369261?language=en
• 关键词: Synthesis; Magnetic; Investigations; New; My

A series of new spin bearing carbamato-metal complexes of the general formula [{M(O2NR2)n}m] (M = d- or f- block metals, nkleiner als1; mkleiner als2, R= pyridyl) will be synthesized using new sec.-amine ligands with directing groups R. The magnetic exchange interactions of this class of compounds will be investigated for the first time systematically. Departing from the obtained carbamato-metal complexes, the related µ-OH derivatives should be accessible by controlled hydrolysis reactions. This latter class of compounds exhibits strong structural similarity to the magnetically well-investigated class of large µ-OH clusters possessing a very high ground state spin arising from ferromagnetic interactions of the paramagnetic centres. Certain members of that class behave as "single molecular magnets" (SMM's) due to quantum tunnelling relaxation at rather low temperatures. Thus, magneto-structural property correlations of the newly synthesized carbamato-metal complexes and of their µ-OH derivatives will be studied in order to understand the factors that lead to high-spin ground states and magnetic anisotropy. Such correlations for a new class of compounds will be an essential contribution in the directed search for new molecule based magnets.

利用新的合成方法，合成了一系列新的具有自旋的氨基甲酸根-金属配合物[{M（O_2NR_2）_n}_m]（M = d-或f-区金属，nkleiner_als_1; mkleiner_als_2，R=吡啶基）。具有导向基团R的胺配体。这类化合物的磁交换相互作用将首次得到系统的研究。与所获得的氨基甲酸根合金属络合物不同，相关的µ-OH衍生物应可通过受控的水解反应获得。后一类化合物与磁性研究充分的大µ-OH簇具有很强的结构相似性，这些大µ-OH簇具有由顺磁中心的铁磁相互作用产生的非常高的基态自旋。由于在相当低的温度下量子隧穿弛豫，该类的某些成员表现为“单分子磁体”（SMM）。因此，将研究新合成的氨基甲酸根合金属络合物及其µ-OH衍生物的磁结构性质相关性，以了解导致高自旋基态和磁各向异性的因素。这类新化合物的相关性将是定向寻找新分子磁体的重要贡献。