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

Irreversible solid-state conversion of Co(II) metal-organic nanocapsule [Co-2(bda)(2)(bpy)(2)] (1), [bda(2-)= 2,2'-biphenyl dicarboxylate and bpy=2,2'-bipyridine], prepared by mechanochemical procedure with empty pore and lozenge-shaped microcube morphology similar to [Cu-2(bda)(2)(bpy)(2)]center dot 4H(2)O (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).