Two Supramolecular Microporous Metal–Organic Frameworks Templated by Keggin Polyoxometalates

Abstract

Two new Keggin polyoxometalates (POM)-templated supramolecular metal–organic frameworks (MOF) with micropores, Cu3(L)6[H3(PMo12O40)2]·6H2O (1) and Cu3(L)6[H5(SiW12O40)2]·6H2O (2) (L = 1,2-bis(imidazol-1-ylmethyl)ethane), have been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra and cyclic voltammetry. These two isostructural compounds are constructed by two distinct moieties, a Keggin polyanion and a linear [Cu(L)2]+ subunit. The [Cu(L)2]+ subunits further form a microporous MOF through supramolecular interactions. The Keggin polyanions act as templates inducing the micropores. The electrochemical and electrocatalytic behavior of compounds 1 and 2 bulk-modified carbon paste electrodes (1-, 2-CPE) was studied.