New polynucleating ligands and their metal complexes with spin crossover activity

补贴应允许新的聚成核配体及其复合物的合成和表征的基础上使用的配体系统在Jäger教授的研究小组。在由德国图林根大学（Freistaat Thüringen）（1996 - 1999）创立的“磁性材料用于基础分子协调技术和传感器”项目的框架内，大量单核以及一些双核铁、铜和钴配合物已经合成并进行了磁性表征。特别是一些单核铁配合物表现出有趣的磁性行为，如低温下的自发磁化，变磁性和各种自旋交叉现象。所获得的知识的影响pheripheral取代基上的赤道配体以及轴向配体上的配体场的强度，因此对金属中心的磁性是一个很好的池，有目的地合成的聚成核配体和它们的金属配合物。这种配合物提供了可能性，以调查系统与铁或亚铁磁金属中心之间的相互作用，以及耦合自旋交叉现象。

The subsidies should allow the synthesis and characterisation of new polynucleating ligands and their complexes based on the ligand system used in the research group of Professor Jäger. In frame of the project "Magnetmaterialien für Kommunikationstechnik und Sensorik auf Basis molekularer Koordinationsverbindungen" founded by the Freistaat Thüringen (1996 - 1999), a large number of mononuclear as well as some dinuclear iron, copper and cobalt complexes have been synthesised and magnetically characterised. Especially some of the mononuclear iron complexes showed interesting magnetic behaviour as spontaneous magnetisation at low temperatures, metamagnetism and various spin crossover phenomena. The obtained knowledge about the influence of pheripheral substituends on the equatorial ligand as well as the axial ligand on the strength of the ligand field and therefore on the magnetic properties of the metal centre is an excellent pool for purposeful synthesis of polynucleating ligands and their metal complexes. This complexes offer the possibility to investigate systems with ferro- or ferrimagnetic interactions between the metal centres as well as coupled spin crossover phenomena.