Hydrothermal synthesis and characterization of the tri-capped and mono-supported pseudo-Keggin-type tungstovanadophosphate: {PW4VIW5VV3IVO40(VIVO)3[Cu(en)2]}6−

A novel polyoxometalate [Cu(phen)2]3{PW4VIW5VV3IVO40(VIVO)3[Cu(en)2]}⋅4H2O 1 (en=ethylenediamine, phen=1,10-phenanthroline) has been synthesized hydrothermally and characterized by elemental analysis, IR, XPS, TG, EPR and single-crystal X-ray diffraction analysis. The crystal structure analysis shows that compound 1 contains a novel highly reduced tri-capped and mono-supported pseudo-Keggin-type heteropolyanion, {PW4VIW5VV3IVO40(VIVO)3[Cu(en)2]}6−, three [Cu(phen)2]2+ cations and four lattice water molecules. They are further linked to form three-dimensional supramolecular networks through extensive hydrogen bonding and π–π stacking interactions. Interestingly, the water dimer and terminal oxygen of the cluster polyanion constitute a beautiful supramolecular helix chain. The heteropolyanion is the first example of tri-capped and mono-supported pseudo-Keggin-type tungstovanadophosphate and the pH value is crucial for obtaining compound 1 in synthetic procedure.

A novel complex [Cu(phen)2]3{PW4VIW5VV3IVO40(VIVO)3[Cu(en)2]}⋅4H2O, the first example of tri-capped and mono-supported highly reduced pseudo-Keggin-type tungstovanadophosphate was synthesized under hydrothermal condition. And the heteropolyanions are linked by water dimer and cation [Cu(phen)2]2+ through the hydrogen bond forming a three-dimensional (3D) supramolecular network. Interestingly, the water dimer and terminal oxygen of the polyanion cluster constitute a beautiful supramolecular helix chain.Figure optionsDownload as PowerPoint slide