Diversified polyoxovanadate derivatives obtained by copper(i)-catalysed azide-alkyne cycloaddition reaction: their synthesis and structural characterization.

In this work, we confirmed that the copper-catalysed azide-alkyne cycloaddition (CuAAC) reaction is an effective method for the organic-functionalization of polyoxometalates (POMs). Herein, for the first time, four novel 1,2,3-triazole functionalized polyoxovanadate (POV) organic-inorganic hybrids, (Bu4N)(2)[ V6O13{(OCH2)(3)C5H6N3O}(2)]center dot 1.5CH(3)CN(2), (Bu4N)(2)[V6O13{(OCH2)(3)C7H8N3O2}(2)] center dot 2CH3CN3, (Bu4N)(2)[ V6O13{(OCH2)(3)C11H10N3}(2)] 4 and (Bu4N)(2)[V6O13{(OCH2)(3)C10H7N3Cl}(2)](5) were prepared through the CuAAC reaction using the azide functionalized hexavanadate, (Bu4N)(2)[V6O13{(OCH2)(3)CCH2N3}(2)] center dot 2.5CH(3)CN 1, as the precursor, where CuI was used as the catalyst and N, N-diisopropylethylamine (DIPEA) as a stabilizer for CuI. All the four compounds were structurally and compositionally characterized by single-crystal X-ray diffraction, elemental analyses, powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR), H-1 NMR, ESI-MS, UV-Vis and thermogravimetric analysis (TGA).