Linker functionalisation triggers an alternative 3D-topology for Zn-isophthalate-4,4′-bipyridine frameworks

Abstract

A series of four Zn²⁺ metal–organic frameworks containing functionalised isophthalate linkers and 4,4′-bipyridine pillars have been prepared and characterised. Isophthalates which contain –OC₃H_2n+1 alkoxy side chains (with n = 1, 2 or 3) form frameworks with a 3D pillared-layer topology instead of the typical 2D layer topology of the renowned coordination polymers with an interdigitated structure (CIDs), which is found for shorter –OC₂H₅ side chains. The gas adsorption properties of the materials were analysed using N₂, CO₂ and O₂ adsorption measurements at low temperatures.