Electrochemical behavior and luminescent properties of a multilayer film containing mixed-addenda polyoxometalates K10H3[Eu(SiMo9W2O39)2] and tris(2,2′-bipyridine)ruthenium(II)

Inorganic–organic composite films containing the mixed-addenda heteropolytungsto-molybdate K10H3[Eu(SiMo9W2O39)2]⋅xH2O (abbreviated as EuSiMo9W2) and tris(2,2′-bipyridine)ruthenium(II) Ru(bpy)2+3 (abbreviated as Ru(bpy)3) were fabricated by the layer-by-layer self-assembly method. UV–vis spectroscopy shows that the absorbance values at characteristic peaks increase linearly with the number of EuSiMo9W2/Ru(bpy)3 bilayers, suggesting that the deposition process is linear and highly reproducible from layer to layer. The composition of the multilayer film was measured by X-ray photoelectron spectra. Atomic force microscopy presented a correspondingly uniform surface morphology and a homogeneity of the multilayer films. The film exhibited photoluminescence arising from the d–π∗d–π∗ metal-to-ligand transition of Ru2+, and 5D0 metastable state to terminate levels in the 7FJ (J=0–4J=0–4) ground-state multiplet transitions of Eu3+. The film also exhibited catalytic activities toward the reduction of IO−3, H2O2, BrO−3, NO−2 and the oxidation of C2O2−4. It may provide a novel material as bifunctional electrocatalysts and fluorescence probes in biochemistry, luminescence sensors, electroluminescent optical devices, and so on.

An inorganic–organic composite film containing the mixed-addenda heteropolytungsto-molybdate K10H3[Eu(SiMo9W2O39)2]⋅xH2O and tris(2,2′-bipyridine)ruthenium(II) Ru(bpy)2+3 was fabricated by the layer-by-layer self-assembly method. The film exhibited photoluminescence arising from d–π∗d–π∗ metal-to-ligand transition of Ru2+, and 5D0 metastable state to terminate levels in the 7FJ (J=0–4J=0–4) ground-state multiplet transitions of Eu3+. The film also exhibited catalytic activities towards the reduction of IO−3, H2O2, BrO−3, NO−2 and the oxidation of C2O2−4.Figure optionsDownload as PowerPoint slide