Cobalt complexes tuned by Anderson-type polyoxometalates and bis-amide derivative ligands featuring a ‘V’-like connector for efficient ampere sensing and the visible-light catalytic reduction of Cr(vi)

Four cobalt( ii ) complexes assembled from two new bis-amide derivative N-donor ligands and Anderson-type polyoxometalates display excellent electrochemical sensing and photocatalytic reduction activities toward Cr( vi ) ions.