Tuning the Topology from fcu to pcu: Synthesis and Magnetocaloric Effect of Metal–Organic Frameworks Based on a Hexanuclear Gd(III)-Hydroxy Cluster,Crystal Growth & Design

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Tuning the Topology from fcu to pcu: Synthesis and Magnetocaloric Effect of Metal–Organic Frameworks Based on a Hexanuclear Gd(III)-Hydroxy Cluster
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2018-12-06 00:00:00 , DOI: 10.1021/acs.cgd.8b01566
Wei Wei _{1,

2} , Xue Wang ₃ , Kai Zhang _{1,

2} , Chong-Bin Tian ₁ , Shao-Wu Du ₄

Affiliation

Two polynuclear, cluster-based metal–organic frameworks (MOFs), formulated as {H₂[Gd₆(OH)₈(H₂O)₆(p-BDC-F₄)₆]·3(2,2′-bpy)·6H₂O} (1) and {H₂[Gd₆(OH)₈(H₂O)₆(m-BDC-F₄)₆]·3(4,4′-bpy)·6H₂O} (2) (p-BDC-F₄ = tetrafluoroterephthalic acid, m-BDC-F₄ = tetrafluoroisophthalic acid), are synthesized by hydrothermal reactions of Gd^III ions with perfluorinated benzenedicarboxylate. Structure analysis illustrates that both 1 and 2 are constructed by the hexanuclear Gd^III-hydroxy cluster molecular building block {Gd₆(OH)₈(COO)₁₂(H₂O)₆}, generating a 12-connected fcu-MOF and a 6-connected pcu-MOF, respectively. Compounds 1 and 2 are stable in some refluxing organic solvents, boiling water, and aqueous solutions in the pH range of 2–11. Notably, magnetic investigation indicates that 1 and 2 display a significant magnetocaloric effect.

中文翻译：

从fcu到pcu调整拓扑：基于六核Gd（III）-羟基簇的金属-有机骨架的合成和磁热效应

两个多核，基于簇的金属有机框架（MOF），公式为{H ₂ [Gd ₆（OH）₈（H ₂ O）₆（p -BDC-F ₄）₆ ]·3（2,2'- bpy）·6H ₂ O}（1）和{H ₂ [Gd ₆（OH）₈（H ₂ O）₆（m -BDC-F ₄）₆ ]·3（4,4'-bpy）·6H ₂ O}（2）（p -BDC-F ₄ =四氟对苯二甲酸，m -BDC-F₄ =四氟间苯二甲酸）是通过Gd ^III离子与全氟化苯二甲酸酯的水热反应合成的。结构分析表明1和2均由六核Gd ^III-羟基簇分子构建模块{Gd ₆（OH）₈（COO）₁₂（H ₂ O）₆ }构成，生成了12个连接的fcu-MOF和一个6个连接的pcu-MOF。化合物1和2在某些回流的有机溶剂，沸水和pH范围为2-11的水溶液中稳定。值得注意的是，磁查表明图1和2显示出显着的磁热效应。

更新日期：2018-12-06

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