Synthesis, structure and property of a new inorganic–organic hybrid compound [Cu(phen)2][Cu(phen)H2O]2[Mo5P2O23]·3.5H2O

A new polyoxomolybdophosphate 1, formulated as [Cu(phen)2][Cu(phen)H2O]2[Mo5P2O23]·3.5H2O (phen = 1,10-phenanthroline) has been synthesized under hydrothermal conditions. Compound 1 crystallizes in the triclinic space group P-1 with a = 12.2429(5) Å, b = 14.3543(5) Å, c = 20.0814(8) Å, α = 80.023 (1)°, β = 74.283 (1)°, γ = 66.452(1)°, V = 3105.8(2) Å3, R1 = 0.0375, wR2 = 0.0885, Z = 2 and GOF = 1.009. Compound 1 is constructed from diphosphopentamolybdate clusters coordinated to Cu(II)-phen units, and free water molecules, which are connected to a three-dimensional framework via π–π stacking interactions from the phen ligands. The single-crystal X-ray diffraction, FT-IR, TG-DTA, XPS, EPR and fluorescent spectra for this compound were determined. The electrochemical properties of compound 1 are studied using cyclic voltammogram, the results indicated that the compound 1 shows good electrocatalytic activity to NO2−.

Graphical abstractA new polyoxomolybdophosphate 1, formulated as [Cu(phen)2][Cu(phen)H2O]2[Mo5P2O23]·3.5H2O (phen = 1,10-phenanthroline) has been synthesized under hydrothermal conditions. Compound 1 crystallizes in the triclinic space group P-1 with a = 12.2429(5) Å, b = 14.3543(5) Å, c = 20.0814(8) Å, α = 80.023(1)°, β = 74.283(1)°, γ = 66.452(1)°, V = 3105.8(2) Å3, R1 = 0.0375, wR2 = 0.0885, Z = 2 and GOF = 1.009. Compound 1 is constructed from diphosphopentamolybdate clusters coordinated to Cu(II)-phen units, and independent water molecules, which are connected to a three-dimensional framework via π–π stacking interactions from the phen ligands. The FT-IR, TG–DTA, XPS, EPR, fluorescent spectra and electrochemical properties for this compound were studied.Figure optionsDownload full-size imageDownload as PowerPoint slide