A 3-D supramolecular compound based on Keggin-type polyoxometalates and potassium-sulfanilamide

A Keggin-type polyoxometalate and potassium-sulfanilamide complex, [{K(C6H10N2O2S)(2) (H2O)}(2)(SiW12O40)(2)]center dot 2H(3)O(+)center dot 10H(2)O (1), has been synthesized and characterized by elemental analyses, IR, TG, and single-crystal X-ray diffraction. Compound 1 exhibits infinite 1-D dimer chains which are constructed from Keggin units [alpha-SiW12O40](4-) bridged by potassium-sulfanilamide fragments. These 1-D chains are linked via pi-pi interactions between benzene rings of the sulfanilamides to form 2-D layers, which are further packed into 3-D supramolecular assemblies through hydrogen bonds. The electrochemical and electrocatalytic behaviors of 1 have been studied in detail.