By introducing a new "V"-like semirigid bisimidazole-bis-amide ligand, 4,4'-bis(1H-imidazole-4carboxamide)phenylmethane (L), into a reaction system containing Anderson-type polyoxoanions, three polyoxometalate-based metal-organic complexes (POMOCs) with different metal ions were successfully synthesized under solvothermal conditions. The as-prepared POMOCs5H 2 O (3) show sandwich-like supramolecular structures. Complexes 2 and 3 are isostructural, having two [ML(H 2 O) 2 ] 2+ chains with [AlMo 6 (OH) 6 O 18 ] 3− polyoxoanions as pendants arranged in an interdigital mode to construct the sandwich-like architecture, whereas in complex 1 the anionic [Zn(H 2 O) 2 (TeMo 6 O 24 )] 4− chain is sandwiched by two cationic [ZnL(H 2 O) 2 ] 2+ chains to generate the supramolecular structure. POMOCs 1-3 display excellent electrochemical sensing behavior for Cr(VI), Fe(III), BrO 3 − , and NO 2 − ions and efficient catalytic performance in sulfide oxidation. The effect of the central metal on the electrochemical sensing and sulfide oxidation performance and that of the special architecture of 1 on the detection ability are discussed.