Crystal Structure and Characterization of a Novel 2D Layered Compound Assembled from Paradodecatungstate Clusters

A novel 2D layered compound (H4HMTA)2(H3O)2{Na2(H2O)6(H2W12O42)}Cl2·11H2O(HMTA = hexamethylenetetraamine) has been synthesized and characterized by elemental analyses, IR, UV-Vis and X-ray diffraction. C12H74C12N8Na2O61W12 (Mr = 3629.87) crystallizes in the triclinic system, space group P1 with a = 10.5518(2), b = 12.1837(2), c = 14.3088(2) A, α = μ(MoKα) = 21.705 mm-1, F(000) = 1634, the final R = 0.0287 and wR = 0.0686 for 5846 observed reflections with I ＞ 2σ(I). The 2D layered network is assembled from paradodecatungstate clusters linked by simple sodium-oxo bridging groups. The compound exhibits electrocatalytic activities toward both reduction and oxidation of nitrite.