4.5 Article

Synthesis and Electrochemistry of Free-Base Porphyrins Bearing Trifluoromethyl meso-Substituents

Journal

CHEMELECTROCHEM
Volume 9, Issue 5, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202101604

Keywords

Electrochemistry; Electron-withdrawing group; Fluorinated substituent; Porphyrins

Funding

  1. Ecole Normale Superieure de Lyon (ENSL)
  2. Societe Chimique de France (SCF, division NanoSciences)
  3. GDR CNRS 2067 Macrocycles Pyrroliques
  4. Region Auvergne-Rhone-Alpes
  5. IDEX 2020 INTERNATIONAL Joint Research Chairs [IDEX/INT/2020/19 OPE-2020-0088]
  6. ANR [ANR-CE06-0020-01]

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CF3-substituted porphyrins have attracted increasing interest. This study reports the synthesis of a series of free base porphyrins incorporating one, two, and three CF3 substituents, including a never-before-described 5,10,15-tris(CF3) substituted porphyrin. Detailed electrochemical and spectroscopic analyses were carried out to assess the electron-withdrawing properties of CF3 substituents compared to C6F5. The study proposes an interpretation of the unusual electrochemical signature of these molecules featuring three successive one-electron reduction waves.
CF3-substituted porphyrins have attracted increasing interest over the past decade. However, the number of examples reported in the literature remains quite limited and much remains to be done to understand the properties and reactivity of these molecules. We are now reporting on the synthesis of a series of free base porphyrins incorporating one, two and three CF3 substituents, including the 5,10,15-tris(CF3) substituted porphyrin which has never been described before. We have also carried out detailed electrochemical and spectroscopic analyses aiming at assessing the electron-withdrawing properties of the CF3 substituents compared to the widely used C6F5. Our studies led us to propose an interpretation of the quite unusual electrochemical signature of these molecules featuring three successive one-electron reduction waves.

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