Construction of a New 3D Zn(II) MOF with a mog Topology From 2-(Hydroxymethyl)-1H-imidazole-4,5-dicarboxylate

Abstract

A new 3D Zn(II) MOF based on 2-(hydroxymethyl)-1H-imidazole-4,5-dicarboxylic acid (H4hmIDC), formulated as {[Zn3(HhmIDC)2(H2O)2]·2H2O}n, has been successfully prepared under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction, elemental analysis and infrared spectroscopy, as well as power X-ray diffraction. It is worth noting that the unique HhmIDC3− ligand in the title compound adopts an unusual coordination mode, namely µ4-kN,O: kN′,O′: kO″,O‴: kO′′′′ to link the Zn(II) ions into an interesting 3D coordination framework. Such a 3D network can be further simplified as a binodal 4-connected mog (moganite) topology with the Schlafli symbol of (4·64·8)2(42·62·82). Moreover, the title Zn(II) MOF shows a relatively high thermal stability up to 340 °C, and exhibits an intense blue emission centered at 450 nm upon excitation at 370 nm. A new 3D microporous Zn(II) MOF with an uncommon binodal 4-connected mog topology has been constructed from 2-(hydroxymethyl)-1H-imidazole-4,5-dicarboxylic acid (H4hmIDC). Such a Zn(II) MOF displays a relatively high thermal stability and exhibits very strong blue photoluminescence with a maximum emission band at 450 nm when excited at 370 nm.