We demonstrated the construction of binary phase diagrams of coordination polymer crystals by using their reversible solid–liquid transition (melting and crystallization) behaviors. Three types of binary phase diagrams of Ag⁺-based coordination polymers were made and the origins of each diagram formation were investigated. All diagrams showed eutectic phenomena induced by ligand exchange reactions at the interface of the two constituents. Solid solution formation was observed when we used two crystals with similar structures and coordination geometries, and the reaction was driven by both the anion and ligand exchange processes. The optimal binary compounds found in the phase diagrams were applicable as a latent heat storage material working at 100 °C with high energy recovery efficiency, stability in phase-transition cycles, and large hysteresis of melting/crystallization.

中文翻译：

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具有共晶行为的配位聚合物的二元相图


我们通过使用配位聚合物晶体的可逆固液转变（熔化和结晶）行为来演示配位聚合物晶体的二元相图的构建。制作了三种类型的 Ag⁺ 基配位聚合物的二元相图，并研究了每种图形成的起源。所有图表都显示了两种成分界面处配体交换反应诱导的共晶现象。当我们使用两个具有相似结构和配位几何形状的晶体时，观察到固溶体的形成，并且反应是由阴离子和配体交换过程驱动的。相图中发现的最优二元化合物适用于在 100 °C 下工作的潜热储存材料，能量回收效率高，在相变循环中保持稳定性，并且熔化/结晶滞后性大。