Preorganized bi- and trimetallic complexes as building blocks for the controlled assembly of extended coordination compounds with magnetic ordering

该项目有助于回答的基本问题：如何才能实现长程磁有序叠氮化物桥接协调框架中以可预测的方式？两个相互交织的研究路线如下：（i）一组双核吡唑配体用于控制组装的新型叠氮桥连的1D J-交替链化合物。在预组织的双链结构单元内，叠氮化物共配体的结合模式由配体支架的特性预先确定。这种模块化的方法也使两个不同的耦合常数的明确分配，因为寡核苷酸种类，代表的片段的延伸交替链可以选择性地从不对称的双核配体制备。(ii)研究了具有特殊叠氮桥的新型寡聚配合物的磁性，其中每个叠氮离子分别连接三个或四个金属离子。由这种多重桥接配体介导的磁超交换的知识将扩展已经为更简单和更常见的叠氮化物结合模式开发的磁结构相关性。最后，这些叠氮键的组装与长程磁有序的2D和3D扩展的协调网络进行了探讨。

The project contributes to answer the basic question: how can long-range magnetic ordering be achieved in azide bridged coordination frameworks in a predictable manner? Two intertwined lines of research are followed: (i) A set of dinucleating pyrazolate ligands is used for the controlled assembly of novel azide-bridged 1D J-alternating chain compounds. Within the preorganized bimetallic building blocks, the binding mode of the azide co-ligand is predetermined by the characteristics of the ligand scaffold. Such modular approach also enables the unambiguous assignment of the two different coupling constants, since oligonuclear species that represent fragments of the extended alternating chain can be selectively prepared from unsymmetrical dinucleating ligands. (ii) The magnetic properties of novel oligonuclear complexes with unusual azide bridges are studied, in which each azide ion links three or four metal ions, respectively. Knowledge of the magnetic superexchange mediated by such multiply bridging ligands will extent the magnetostructural correlations already developed for the simpler and more common azide binding modes. Finally, these azide linkages are probed for the assembly of 2D and 3D extended coordination networks with long-range magnetic ordering.