Understanding the magnetic properties of room temperature magnets synthesized by post-synthetic redox methodology

A new benchmark has been discovered by our team regarding molecule-based magnets with the highest ordering temperature. The post-synthetic reduction of the 2D Cr(pyz)2Cl2 (pyz = pyrazine) network generates a material showing hysteresis up to 515 K. For this, we have begun tuning the properties through the post-synthetic reductions of Cr(pyz)2I2 by replacing the chloride ligands with its larger congener iodide. Moreover, partial reduction of these systems opens a gateway to mixed-valence states. To overcome the challenges faced with these materials in correlating their properties with both the solid-state and electronic structure, this proposal aims to shed light on structure-property relationships of this system through a series of partially and fully reduced networks through the collective techniques of high-resolution powder X-ray diffraction (HR-PXRD), X-ray absorption near edge structure (XANES) and X-ray magnetic circular dichroism (XMCD).

我们团队发现了一项关于具有最高有序温度的分子基磁体（molecule-based magnets）的新基准。二维Cr(pyz)₂Cl₂（pyz=吡嗪）网络的后合成还原（post-synthetic reduction）可生成一种磁滞现象温度高达515K的材料。为此，我们已开始通过Cr(pyz)₂I₂的后合成还原调节其性质——将氯化物配体替换为更大的同类物碘化物。此外，这些体系的部分还原为混合价态（mixed-valence states）的实现开辟了途径。为克服这类材料在性质与固态及电子结构关联方面面临的挑战，本提案旨在通过高分辨率粉末X射线衍射（HR-PXRD）、X射线吸收近边结构（XANES）和X射线磁圆二色性（XMCD）等综合技术，阐明该体系中一系列部分还原及完全还原网络的构效关系。