Oligonuclear carboxylate-brigded transition metal complexes as a) heteronuclear coordination compounds, b) coordination compounds with redox non-innocent ligands, c) complexes with additional organometallic capping groups

含有多于一个金属离子的分子物种提供了金属中心之间的合作行为的可能性，这可能导致新的性质和反应性。自然界利用这种合作性质的酶催化几个不同的过程，但此外，寡金属配合物的基本兴趣领域的分子为基础的磁铁，与最彻底的研究单分子磁铁的例子是氧和羟基桥接的多金属系统。通过改变自旋系统的电子性质的系统变化将进行光谱学和磁学研究，以建立具有额外自旋携带有机单元的异金属化合物或金属络合物的磁结构关系。在该项目中，我们将使用新的合成策略从众所周知的过渡金属簇开始制备新的配位化合物。杂多核配合物和带有氧化还原活性配体的化合物将通过X射线晶体学、穆斯堡尔和紫外-可见光谱法以及磁化率测量来获得和详细研究。这项研究的成功实施将提供对包括各种自旋中心在内的新的同金属和异多金属化合物的合成策略的深刻理解。我们长期以来对具有基本羧酸基团的多核铁系统的磁结构相关性研究的兴趣和经验为我们成功开展有序多维自旋阵列项目提供了基础。

Molecular species containing more than one metal ion offer the possibility of co-operative behavior between the metal centers, which may lead to new properties and reactivity. Nature utilizes such co-operative properties in enzymes that catalyze several different processes, but moreover oligonuclear metal complexes are of fundamental interest in the field of molecule-based magnets, with the most thoroughly investigated examples of single molecule magnets being oxo- and hydroxo-bridged polymetallic systems. The systematic variation of the electronic properties by means of varying the spin system will be studied spectroscopically and magnetically in order to establish magneto-structural relationships for heterometallic compounds or metal complexes with additional spin carrying organic units. In the project we will prepare new coordination compounds starting from well-known transition metal clusters as building blocks using new synthetic strategies. Heteropolynuclear complexes and compounds bearing redox-active ligands will be obtained and studied in detail by X-ray crystallography, spectroscopic methods like Mössbauer and UV-Vis as well as magnetic susceptibility measurements. Successful performance of this research will provide a profound understanding of synthetic strategies to new homo- and heteropolymetallic compounds including various spin centers. Our long-standing interest and experience in the study of magneto-structural correlations in polynuclear iron systems with basic carboxylate groups provides us with the basis to successfully carry out the project on ordered multidimensional spin arrays.