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 language | English |
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Pages (from-to) | 1238-1241 |
Number of pages | 4 |
Journal | Inorganic Chemistry Communications |
Volume | 7 |
Issue number | 11 |
DOIs | |
State | Published - 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