New polynucleating ligands and their metal complexes with spin crossover activity

补贴应允许根据Jäger教授研究小组使用的配体系统合成和表征新的多核配体及其络合物。在Freistaat Thüringen(1996-1999)创立的“MagnetMaterial für Komomikation stechnik and Sensorik Auf BASE分子配位和Verbindungen”项目的框架内，合成了大量的单核和一些双核的铁、铜、钴配合物，并对其进行了磁性表征。特别是一些单核铁络合物表现出有趣的磁性行为，如低温自发磁化、超磁和各种自旋交叉现象。所获得的关于外围取代基对赤道配体以及轴向配体对配位场强度的影响从而对金属中心的磁性的影响的知识是有目的地合成多核配体及其金属络合物的极好的库。这些络合物提供了研究金属中心之间具有铁磁或亚铁磁性相互作用的系统以及耦合自旋交叉现象的可能性。

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.