Abstract
Three new compounds based on arsenic–vanadium clusters {[Cu(im)2]4[H2As8V14O42(SO4)]}·H2O (1) and [Cu(phen)(im)]3[Cu(phen)2][As8V14O42(H2O)] (2, 3) (im=imidazole, phen=phenanthroline) have been synthesized and characterized by IR, UV–Vis, XRD, TG analysis, elemental analysis, single-crystal X-ray diffraction analysis and catalytic properties. Crystal analysis reveals that compound 1 shows an unprecedented 3-D twofold interpenetrating network structure with each of the two interpenetrating frameworks exhibiting a novel diamondoid framework structure based on POMs and transition metal complexes. Compounds 2 and 3 are based on identical polyanions and identical transition metal complexes. However, the two compounds are not isomorphous and isostructural with each other. That is to say, the two compounds have an identical chemical formula with different structures: the two are polymorphs of each other. In addition, catalytic properties of compounds 1–3 have been studied.
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