Structural characterization of two lanthanide complexes attached to [H 2 W 12 O 40 ] 6−

In this article, two compounds [H 2 bpy][Ln(DMF) 4 (H 2 O) 3 (Hbpy)][H 2 W 12 O 40 ] (Ln = La,Ce; DMF = N , N -dimethylformamide, bpy = 4,4′-bipyridine) have been synthesized and characterized by single-crystal X-ray diffraction, IR spectra, and TG analysis. X-Ray analysis showed that the [Ln(DMF) 4 (H 2 O) 3 (Hbpy)] 4+ unit is supported on the α-Keggin polyoxoanion [H 2 W 12 O 40 ] 6− via the surface bridging oxygen atom. The [H 2 bpy][Ln(DMF) 4 (H 2 O) 3 (Hbpy)][H 2 W 12 O 40 ] entity is further extended into 2D supramolecular networks with 1-D channels by hydrogen-bonding interactions, in which 4,4′-bipy ligands reside. To the best of our knowledge, these complexes represent the first examples of rare earth metal-organic complex-decorated α-metatungstate clusters. Furthermore, the electrochemical properties of these compounds have been studied via the method of bulk-modified carbon paste electrodes.