Electrochemical reduction of nitrite at poly-[Ru(5-NO2-phen)2Cl] tetrapyridylporphyrin glassy carbon modified electrode

► The preparation and characterization of modified electrodes with Poly-tetraruthenated porphyrin (with Ni2+, Zn2+ and metal free) is described. The polymeric film consist of tetrapyridylporphyrins coordinated to four [Ru(5-NO2-phen)2Cl]+ moieties. ► These polymeric surfaces are able to reduce NO2− from −0.3 V, and hydroxylamine was the product of higher production. ► The modified electrode with Ni2+ polymer was used as an amperometric sensor toward nitrite detection, showed a limit of detection of 9.37 × 10−6 M.