Irreversible solid-state metal ion exchange in cobalt(II) metal–organic nanocapsules synthesized by green mechanochemical process

Abstract

Irreversible solid-state conversion of Co(II) metal–organic nanocapsule [Co2(bda)2(bpy)2] (1), [bda2− = 2,2′-biphenyl dicarboxylate and bpy = 2,2′-bipyridine], prepared by mechanochemical procedure with empty pore and lozenge-shaped microcube morphology similar to [Cu2(bda)2(bpy)2]∙4H2O (2) analogue with agglomerated nanostructure morphology was studied. The structure of 1 is exactly the same as 2 and the metal ion has distorted octahedral coordination in both of them. In addition to the same structures of 1 and 2, the similar crystal data of them also approved that this reaction can occur in solid state by cation exchange process. Solid-state cation exchange processes of these metal–organic nanocapsules were studied by IR spectroscopy, X-ray powder diffraction (XRD) and scanning electron microscopy (SEM).