Investigation of Spin Transition Processes and Magnetic Exchange Interactions in Discrete Transition Metal Complexes

配位化合物磁性的详细研究对于理解分子磁性的基本原理是至关重要的，这是一个目前对科学和工业越来越重要的研究领域。本文描述了含有1-4个金属离子并具有不同磁中心分子拓扑结构的同核和异核配合物的制备和表征。本研究计划的目的是系统地研究磁性作为金属离子d电子构型，配体的空间和电子性质，桥接配体的类型和磁性中心的分子拓扑结构的函数。本文重点研究了d4-d6电子构型金属离子的自旋交叉特性，以及离散分子中金属离子之间以及金属离子与p自由基配体之间的磁交换相互作用。特别考虑通过改变温度或压力、光照射或改变桥接配体的氧化还原状态来切换配合物的磁性能的研究。这些化合物可以作为测试和完善当前描述这些分子磁性事实的理论概念的模型。

A detailed study of the magnetic properties of coordination compounds is crucial for understanding the underlying principles of molecular magnetism, a field of research that is currently of growing importance to science and industry. In this proposal the preparation and characterization of homo- and heteronuclear complexes, which contain 1-4 metal ions and which display distinct molecular topologies of the magnetic centers, are described. The objective of the present research proposal is a systematic study of the magnetic properties as a function of d electron configurations of the metal ions, steric and electronic properties of the ligand, type of bridging ligand, and molecular topology of the magnetic centers. In particular, this investigation focusses on the characterization of spin crossover properties of metal ions with d4-d6 electron configurations and on the magnetic exchange interactions between metal ions as well as between metal ions and p-radical ligands in discrete molecules. Special consideration is given to the study of switching the magnetic properties of the complexes by changing temperature or pressure, by irradiation of light, or by changing the redox state of the bridging ligand. The compounds serve as models for testing and refining current theoretical concepts which describe these facts of molecular magnetism.