Iron Tetrakis Research Articles

Electrochemistry of various substituted aminophenyl iron porphyrins

Abstract The redox properties of dissolved, adsorbed and electropolymerized films of iron(III) tetrakis( o -aminophenyl)porphyrin (Fe(III) ( o -NH 2 )TPP), iron(III) tetrakis( p -aminophenyl)porphyrin (Fe(III) ( p -NH 2 )TPP) and iron(III) tetrakis( p - N, N ' -dimethylaminophenyl)porphyrin (Fe(III) ( p -NMe 2 TPP) have been studied in aqueous solutions. Cyclic voltammetry at glassy carbon electrodes for the complexes dissolved in 1 M HCl showed two Fe(III)/Fe(II) waves with cathodic peak potentials of −0.14 and −0.38 V for Fe( o -NH 2 )TPP, −0.15 and −0.36 V for Fe( p -NH 2 )TPP, and −0.17 and −0.45 V for Fe( p -NMe 2 )TPP. Differential pulse voltammetry also revealed two reduction waves for Fe( o -NH 2 )TPP adsorbed on a glassy carbon electrode (−0.16 and +0.08 V) and only one reduction process for Fe( p -NH 2 )TPP (−0.24 V) and Fe(NMe 2 )TPP (−0.25 V). The reduction peak potentials for the polymeric films at pH 3.2 ±0.2 are −0.22 and +0.12 V for poly[Fe( o -NH 2 )TPP], −0.22 and -0.07 V for poly[Fe( p -NH 2 )TPP and −0.18 and −0.02 V for poly[Fe( p -NMe 2 )TPP]. Thin-layer spectroelectrochemical techniques for the dissolved iron porphyrins and cyclic voltammetry for the polymeric films in strong acidic solutions indicated irreversible changes resulting from a demetallation process occurring upon reduction. The demetallation rate for the Fe(II) ( p -NMe 2 TPP compound (8×10 −4 s −1 ) was about 20-fold smaller than that of the Fe(II) ( p -NH 2 )TPP complex. In contrast, the polymeric films showed high stability at pH > 3: the cyclic voltammetric peak currents decreased by only 2% after 100 subsequent cycles in the potential range +0.4 to −0.8 V.

ChemInform Abstract: Resonance Raman and Surface‐Enhanced Resonance Raman Scattering Studies on Electrochemical Redox Processes of Iron Tetrakis(N‐methyl‐4‐pyridiniumyl)porphine.

Chemischer InformationsdienstVolume 17, Issue 14 Physical Organic Chemistry ChemInform Abstract: Resonance Raman and Surface-Enhanced Resonance Raman Scattering Studies on Electrochemical Redox Processes of Iron Tetrakis(N-methyl-4-pyridiniumyl)porphine. T. KOYAMA, T. KOYAMASearch for more papers by this authorM. YAMAGA, M. YAMAGASearch for more papers by this authorM. KIM, M. KIMSearch for more papers by this authorK. ITOH, K. ITOHSearch for more papers by this author T. KOYAMA, T. KOYAMASearch for more papers by this authorM. YAMAGA, M. YAMAGASearch for more papers by this authorM. KIM, M. KIMSearch for more papers by this authorK. ITOH, K. ITOHSearch for more papers by this author First published: April 8, 1986 https://doi.org/10.1002/chin.198614043AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume17, Issue14April 8, 1986 RelatedInformation

Resonance Raman and surface-enhanced resonance Raman scattering studies on electrochemical redox processes of iron tetrakis(N-methyl-4-pyridiniumyl)porphine

Resonance Raman and surface-enhanced resonance Raman scattering studies on electrochemical redox processes of iron tetrakis(N-methyl-4-pyridiniumyl)porphine

Chemical properties of water-soluble porphyrins. 1. Equilibriums between some ligands and iron(III) tetrakis(4-N-methylpyridyl)porphyrin

Chemical properties of water-soluble porphyrins. 1. Equilibriums between some ligands and iron(III) tetrakis(4-N-methylpyridyl)porphyrin

Chemical properties of water-soluble porphyrins. 2. The reaction of iron(III) tetrakis(4-N-methylpyridyl)porphyrin with the superoxide radical dioxygen couple

Chemical properties of water-soluble porphyrins. 2. The reaction of iron(III) tetrakis(4-N-methylpyridyl)porphyrin with the superoxide radical dioxygen couple

Electrochemical and spectral speciation of iron tetrakis(N-methyl-4-pyridyl)porphyrin in aqueous media

Electrochemical and spectral speciation of iron tetrakis(N-methyl-4-pyridyl)porphyrin in aqueous media