Oxidase studies of some benzimidazole diamide copper(II) complexes

New bis benzimidazole diamide ligands, N,N′-bis(benzimidazolyl-2-methyl)-2,2′-thiadiethanamide, and N,N′-bis(benzimidazolyl-2-methyl)-3,3′-thiadipropanamide, have been synthesised and utilised to prepare copper(II) complexes with inner sphere ligands like Cl− and NO3−. One of the ligands, GBTAA, has been structurally characterised, while the other GBTPA is characterised via an unusual tetrabenzoate bridged dicopper polymeric structure wherein the ligand GBTPA bridges the two dicopper benzoate units. The copper(II) complexes catalyse the quenching of superoxide radical generated electrochemically.