Spectroscopic and electrochemical characterization of solutions and films of a new redox couple: Co(II)/Co(III) N-confused porphyrin

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17 Scopus citations

Abstract

The films of Co(II) N-confused tetraphenylporphyrin are stable in aqueous base, insensitive to air and show a relatively high oxidation potential attributed to the Co(II)/Co(III)NCTPP couple: 0.025 V vs. Ag/AgCl/KCl (satd.) in 1 M NaOH. Co(II) ion was introduced in N-confused tetraphenylporphyrin (NCTPP) as evidenced by ESR and UV-Vis spectroscopy as well as electrochemical methods. The Co(II)NCTPP complex shows a typical ESR spectrum of a high spin 3d 7 Co(II) ion, Soret bands at 460 and 445 nm in CH 2Cl 2 and CH 3CN, respectively, and oxidation potential of +0.55 V vs. Ag/AgCl/KCl (satd.). Adsorbed films of Co(II)NCTPP on glassy carbon electrodes are stable and show reversible redox waves in aqueous basic solutions attributed to the Co(II)/Co(III)NCTPP couple with E 1/2 = +0.025 V at pH 14. It is also shown that NCTPP can be electropolymerized and the films readily metallate with Co(II) ions.

Original languageEnglish
Pages (from-to)1238-1241
Number of pages4
JournalInorganic Chemistry Communication
Volume7
Issue number11
DOIs
StatePublished - 1 Nov 2004

Keywords

  • Co(II) complex
  • Electropolymerization
  • N-confused porphyrins
  • Redox
  • Spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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