Europium Pyrimidine-4,6-dicarboxylate Framework with a Single-Crystal-to-Single-Crystal Transition and a Reversible Dehydration/Rehydration Process

In this paper, a novel three-dimensional (3D) porous lanthanide–organic framework, Eu2(μ4-pmdc)2(OH)2·3H2O (1), which is stable up to 400 °C, has been hydrothermally synthesized and characterized. It shows intriguing single-crystal-to-single-crystal transformation and reversible dehydration/rehydration phenomenon upon removal and rebinding of the lattice water molecules, which is supported by single-crystal X-ray diffraction, powder X-ray diffraction, and photoluminescence data.本文报道一种新型三维（3D）多孔镧系有机框架材料Eu₂(μ₄-pmdc)₂(OH)₂·3H₂O（记为化合物1），该框架热稳定性可达400℃，通过水热法合成并完成表征。该化合物展现出独特的单晶到单晶转变行为，以及在脱除与重新结合晶格水分子过程中出现的可逆脱水/复水现象，相关结论通过单晶X射线衍射、粉末X射线衍射及光致发光数据得以佐证。