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.

Graphical Abstract

Keywords:

• Hydrothermal synthesis
• Strandberg-type POMs
• electrocatalytic characters
• phosphomolybdate

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by Science and technology research project of Heilongjiang Provincial Department of Education (12531193), the National Natural Science Foundation of China (grant nos. 21771046 and 21571044), and the Natural Science Foundation of Heilongjiang Province (JC2016001, ZD2015001, and B2017007).