Stable Mg‑Metal–Organic Framework (MOF) and Unstable Zn-MOF Based on Nanosized Tris((4-carboxyl)phenylduryl)amine Ligand

By employment of a nanosized tris­[(4-carboxyl)-phenylduryl]­amine ligand (L) to assembly with the Zn2+ or Mg2+ ions, two non-interpenetrating microporous metal–organic frameworks (MOFs) constructed from chain-shaped building units are presented here. The Zn-MOF formulated as ((CH3)4N)­(Zn4L3)·28DMF (FIR-4; DMF = N,N-dimethylformamide, FIR denotes Fujian Institute of Research) is a nanoporous anionic framework, but it is unstable after the removal of guest molecules. In contrast, the Mg-MOF formulated as Mg3L2(H2O)2(DMA)2·2.5DMA (FIR-5; DMA = N,N-dimethylacetamide) features a neutral framework with (3,8)-connected tfz topology derived from kgd subnets and has high permanent porosity with a Langmuir surface area of 1457 m2·g–1.

本文采用纳米级三[(4-羧基)-苯基杜基]胺配体（L），分别与Zn²+、Mg²+离子组装，制备得到两种基于链状构筑单元的非互穿微孔金属有机框架（metal–organic frameworks, MOFs）。其中锌基MOF的化学式为((CH3)4N)(Zn4L3)·28DMF（FIR-4；DMF = N,N-二甲基甲酰胺，FIR为福建物质结构研究所（Fujian Institute of Research）的缩写），属于纳米孔阴离子框架，但脱除客体分子后稳定性较差。与之相比，镁基MOF的化学式为Mg3L2(H2O)2(DMA)2·2.5DMA（FIR-5；DMA = N,N-二甲基乙酰胺），具有中性框架结构，其拓扑为源自kgd子网的(3,8)-连接tfz拓扑，且具备高永久孔隙率，朗缪尔比表面积达1457 m²·g⁻¹。