Ultrasound assisted synthesis of a Zn(ii) metal–organic framework with nano-plate morphology using non-linear dicarboxylate and linear N-donor ligands

Abstract

A 3D, porous Zn(II)-based metal–organic framework {[Zn₂(oba)₂(4-bpdb)]·2DMF}_n (TMU-4) with double interpenetration was prepared by using a non-linear dicarboxylate (H₂oba = 4,4′-oxybisbenzoic acid) and a linear N-donor (4-bpdb = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene) ligand. Also micro- and nano-plates of this MOF were synthesized by a sonochemical process and characterized by scanning electron microscopy, X-ray powder diffraction and IR spectroscopy. The thermal stability was studied by thermogravimetric analysis (TGA). Sonication time and concentration of initial reagents effects on the size and morphology of nano-structured MOFs, were studied. Calcination of TMU-4 at 500 °C under air atmosphere yields ZnO nanoparticles.