The interaction of water-soluble iron porphyrins with DNA films and the electrocatalytic properties for inorganic and organic nitro compounds |
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Authors: | Shen-Ming Chen Sz-Vin Chen |
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Affiliation: | Department of Chemical Engineering, National Taipei University of Technology, No. 1, section 3, Chung-Hsiao East Road, Taipei 10643, Taiwan, ROC |
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Abstract: | The electrochemistry of water-soluble iron porphyrins (Fe(n-TMPyP)) (where n=2 and 4) was studied as an electrochemically active film on DNA modified glassy carbon, gold, platinum, and transparent semiconductor tin oxide electrodes in solutions of various pH values. The two layers of the modified electrode containing the iron porphyrin and the DNA film were prepared by depositing the iron porphyrin on a DNA film modified electrode. The Fe(4-TMPyP)/DNA film was electrocatalytic reductive for p-nitrobenzoic acid in a weak acidic, or neutral aqueous solution through an FeII species, and the electrocatalytic reduction peak potential became more negative than the cathodic peak of the FeIII/II redox couple. The electrocatalytic reduction properties by the Fe(2-TMPyP)/DNA film as catalysts for nitrite reduction have also been determined, and shown to be active through an FeI species and to be pH-dependent. The electrocatalytic oxidation properties of nitrite by Fe(n-TMPyP)/DNA (for n=2 and 4) film have also been determined and shown to be active through an FeIV species with the electrocatalytic oxidation efficiency of NO2− with FeIV(O)(n-TMPyP) being higher than with (HO)FeIV(O)(n-TMPyP). The electrocatalytic oxidation efficiency of NO2− by iron porphyrin is pH-dependent. The electrocatalytic reduction of p-nitrophenol by Fe(2-TMPyP)/DNA film are also discussed. |
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Keywords: | Iron porphyrin DNA Film Electrocatalysis Nitrite Nitro compounds |
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