Four Keggin-type polyoxometalate-based complexes derived from bis(pyrazine)–bis(amide) ligands for electrochemical sensing of multiple analytes and adsorbing dye molecules

Four new Keggin-based complexes derived from bis(pyrazine)–bis(amide) ligands are used to detect multiple analytes (BrO 3 − NO 2 − , Cr( vi ) and Fe( iii ) ions) and adsorb organic dye molecules from aqueous solution.