Synthesis, Characterization, and Autoreduction of a Highly Electron-Deficient Porphycenatoiron(III) with Trifluoromethyl Substituents

Takashi Hayashi, Yuji Nakashima, Kazuyuki Ito, Takahiro Ikegami, Isao Aritome, Katsuhiro Aoyagi, Tsutomu Ando, Yoshio Hisaeda

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Abstract

The synthesis of the first fluorine-containing iron porphycenes, 2,7,12,17-tetraethyl-3,6,13,16-tetrakis(trifluoromethyl)porphycenatoiron(III) chloride [FePc(EtioCF3)]Cl and its μ-oxo dimer [FePc-(EtioCF 3)]2O and their characterizations are reported. The crystal structure of [FePc(EtioCF3)]2O displays a severe saddled distortion of the porphycene framework due to the steric and electronic effects of the CF3 substituents. The oxidation and reduction potentials for then μ-oxo dimer are significantly more positive compared to those observed for the reference μ-oxo dimer of the iron porphycenes and porphyrins having no electron-withdrawing substituent. Moreover, the 1H and 19F NMR spectra of [FePc(EtioCF3)] 2O demonstrated that the μ-oxo dimer is readily converted into the monomeric ferrous complex in pyridine-d5 through autoreduction for 1 day, although the reduction of the reference iron porphycenes and porphyrins are not observed in pyridine. These results indicate that the trifluoromethylated iron porphycene is a highly electron-deficient complex with a pyrrolic macrocycle ligand.

Original languageEnglish
Pages (from-to)7345-7347
Number of pages3
JournalInorganic chemistry
Volume42
Issue number23
DOIs
Publication statusPublished - Nov 17 2003

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All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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