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

预组织双金属和三金属配合物作为构建块，用于通过磁有序控制扩展配位化合物的组装

基本信息

批准号：
5368638
负责人：
Professor Dr. Franc Meyer
金额：
--
依托单位：
Institut für Anorganische Chemie
依托单位国家：
德国
项目类别：
Priority Programmes
财政年份：
2002
资助国家：
德国
起止时间：
2001-12-31 至 2008-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/5368638?language=en
关键词：
Preorganized bi trimetallic complexes building

项目摘要

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.

该项目有助于回答一个基本问题：如何以可预测的方式在叠氮桥配位框架中实现长程磁有序？以下是两条相互交织的研究路线：（i）一组双核吡唑酯配体用于新型叠氮化物桥接的 1D J-交替链化合物的受控组装。在预组织的双金属构件中，叠氮化物辅助配体的结合模式由配体支架的特征预先确定。这种模块化方法还能够明确分配两个不同的偶联常数，因为代表延伸交替链片段的寡核物质可以由不对称双核配体选择性地制备。 (ii) 研究了具有不寻常叠氮桥的新型寡核配合物的磁性，其中每个叠氮离子分别连接三个或四个金属离子。对这种多重桥配体介导的磁性超交换的了解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，探讨这些叠氮键用于组装具有长程磁有序的 2D 和 3D 扩展配位网络。