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

合成了一系列通式为[{M(O2NR2)n}m](M=d-或f-块金属，nkleiner 1；mkleiner als2，R=吡啶)的新型含自旋氨基甲酸酯金属配合物。首次系统地研究了此类化合物的磁交换作用。除了得到的氨基甲酸酯金属络合物外，相关的µ-OH衍生物应该可以通过受控的水解反应来获得。后一类化合物显示出与磁性研究得很好的大的µ-OH团簇的强烈结构相似，这些大的µ-OH团簇具有非常高的基态自旋，产生于顺磁中心的铁磁相互作用。在相当低的温度下，由于量子隧道弛豫，这类分子中的某些成员表现为“单分子磁体”(SMM)。因此，为了了解导致高自旋基态和磁各向异性的因素，我们将研究新合成的氨基甲酸酯金属络合物及其µ-OH衍生物的磁结构性质关联。对一类新化合物的这种关联将在定向寻找新的分子基磁体方面做出重要贡献。

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.