Assembly of three supramolecular compounds based on [P₂Mo₅O₂₃]⁶⁻ and Ni(II) complexes

Abstract

Three supramolecular compounds based on [P₂Mo₅O₂₃]⁶⁻ and Ni(II)–bim, [Ni(bim)₃]₃[P₂Mo₅O₂₃]·2H₂O (1), [Ni(Hbim)(bim)₂]₄[P₂Mo₅O₂₃]₂·3H₂O (2), and [Ni(bim)(Hbim)(phen)]₂[P₂Mo₅O₂₃]·7H₂O (3) (bim = 2,2′-biimidazole, phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions and characterized by elemental analysis, single-crystal X-ray diffraction, IR, and TG. All the compounds show 3-D supramolecular networks constructed from weak interactions among free Ni(II) complex, water, and oxygens of [P₂Mo₅O₂₃]⁶⁻. Compound 3 represents the first supramolecular example integrating {Ni(bim)(Hbim)(phen)} with Strandberg-type phosphomolybdate. The compounds display good electrocatalytic activity to reduce hydrogen peroxide and intense fluorescence properties in solution at room temperature.

Graphical Abstract

Three 3-D supramolecular networks constructed from weak interactions among free Ni(II) complex, water molecule, and oxygen atoms of [P₂Mo₅O₂₃]⁶⁻ polyanions have been synthesized. The compounds display good electrocatalytic activity to reduce hydrogen peroxide and intensive fluorescent properties in the solution at room temperature.

Keywords:

• Supramolecular compounds
• [P₂Mo₅O₂₃]⁶⁻ unit
• Ni(II) complex
• Electrocatalytic activity
• Fluorescent properties

Funding

This work is supported by the National Natural Science Foundation of China [grant number 21271056], [grant number 21371042]; Specialized Research Fund for the Doctoral Program of Higher Education [grant number 20122329110001]; the Natural Science Foundation of Heilongjiang Province [grant number B201216]; Doctoral Initiation Foundation of Harbin Normal University [grant number KGB201214]; and Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University); Ministry of Education; Program for Scientific and Technological Innovation Team Construction in Universities of Heilongjiang Province [grant number 2011TD010].