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.