In Situ XANES of an Iron Porphyrin Irreversibly Adsorbed on an Electrode Surface

Sunghyun Kim, Marnita Sandifer, Daniel Alberto Scherson, In Tae Bae, Mark R. Antonio, Philip N. Ross, Roger Carr, Joseph Woicik

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Abstract

In situ iron K-edge X-ray absorption near edge structure, XANES, has been employed to examine the axial coordination of (µ-OXO)bis [iron meso-tetrakis(4-methoxyphenyl)porphyrin] (FeTMPP) 2 O, irreversibly adsorbed on a high area carbon substrate, Black Pearl (BP), as a function of applied potential. Analysis of the XANES provides conclusive evidence that the coordination about Fe 3+ in the supported, fully oxidized macrocycle is remarkably different from that about Fe 2+ in the corresponding fully reduced macrocycle. In the adsorbed, oxidized state, (FeTMPP) 2 O retains its µ-OXO character and it undergoes a two-electron reduction to yield predominantly four-coordinate square-planar FeTMPP without axial ligation.

Original languageEnglish
Pages (from-to)9063-9066
Number of pages4
JournalJournal of the American Chemical Society
Volume113
Issue number24
DOIs
Publication statusPublished - 1991 Nov 1
Externally publishedYes

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Kim, S., Sandifer, M., Scherson, D. A., Bae, I. T., Antonio, M. R., Ross, P. N., Carr, R., & Woicik, J. (1991). In Situ XANES of an Iron Porphyrin Irreversibly Adsorbed on an Electrode Surface. Journal of the American Chemical Society, 113(24), 9063-9066. https://doi.org/10.1021/ja00024a006