Two novel one-dimensional inorganic-organic hybrids constructed from [H2W12O40]6- clusters and lanthanide-organic complexes:: [(C5H5N-CO2)2Ln(H2O)3]2[H2W12O40]•nH2O (C5H5N-CO2 = pyridine-4-carboxylate; Ln = La3+, n=5; Ce3+, n=7)

Two novel polyoxotungstate-based rare earth compounds, [(C5H5N-CO2)(2)Ln(H2O)(3)](2)-[H2W12O40] center dot nH(2)O (C5H5N-CO2 = pyridine-4-carboxylate; Ln = La3+ (1), n = 5; Ce3+ (2), n = 7), have been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra and TG analyses. The isostructural compounds I and 2 exhibit one-dimensional (ID) zig-zag chains, in which the dinuclear lanthanide complexes act as bridging linkers and the [H2W12O40](6-) groups serve as bidentate ligands. The results of cyclic voltammetry (CV) show that compounds 1 and 2 undergo two two-electron redox processes, similar to that of the parent (NH4)(6)[H2W12O40]center dot 3H(2)O, and also reveal that the pH of the supporting electrolytic solution has a notable effect on the electrochemical behavior of compound 2.