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

本文将利用具有定向基团R的新氨基配体合成一系列具有通式[{M(O2NR2)n} M] （M = d-或f-嵌段金属，nkleiner als1; mkleiner als2， R= pyridyl）的新型自旋氨基配合物，并首次系统地研究了这类化合物的磁交换相互作用。从得到的氨基金属配合物出发，相关的µ-OH衍生物应该可以通过受控的水解反应获得。后一类化合物表现出很强的结构相似性，与磁性研究良好的一类大型μ -OH簇具有很高的基态自旋，这是由顺磁中心的铁磁相互作用产生的。由于在相当低的温度下量子隧穿弛豫，该类中的某些成员表现为“单分子磁体”（SMM's）。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碳马托金属配合物及其µ-OH衍生物的磁结构性质的相关性。这种新型化合物的相关性将对定向寻找新的分子基磁体做出重要贡献。

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.