Three pure inorganic materials based on Strandberg-type phosphomolybdate and different transition metal linkers

Abstract

Three inorganic materials based on Strandberg polyoxoanion, Na10[Ag(P2Mo5O23)]2·8H2O (1), Na8[{Cu(H2O)4}(HP2Mo5O23)2]·8H2O (2), and Na8[{Co(H2O)4}(HP2Mo5O23)2]·6H2O (3), were hydrothermally synthesized and characterized by elemental analyses, IR, TG, and single crystal X-ray diffraction analyses. The compounds are based on the [P2Mo5O23]6− cluster and transition metal linkers. Compound 1 is a 1-D wave-like chain connected by Ag+ bridges. Compounds 2 and 3 are isostructural dimers bonded by {Cu(H2O)4} or {Co(H2O)4} linkers. The 1-D chain and dimeric clusters of 1-3 are further extended to 3-D supramolecular networks via hydrogen bonds and supramolecular interactions. Channels with different sizes are observed in 1-3, in which isolated Na+ and lattice water molecule fill the channels via intermolecular interactions. Weak interactions play important roles in stabilizing the three 3-D networks. Electrochemical and electrocatalytic properties of 1-3 have been investigated.