AI Article Synopsis
- The study presents the synthesis and characterization of new fluorine-containing iron porphycenes, specifically a compound with trifluoromethyl groups.
- The crystal structure of the dimer shows significant distortion due to the steric and electronic effects of these CF(3) groups.
- The new compound exhibits unique electronic properties, including altered oxidation/reduction potentials and a tendency to convert to a ferrous complex in a specific solvent, highlighting its electron-deficient nature.
Article 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(EtioCF(3))]Cl and its micro-oxo dimer [FePc(EtioCF(3))](2)O and their characterizations are reported. The crystal structure of [FePc(EtioCF(3))](2)O displays a severe saddled distortion of the porphycene framework due to the steric and electronic effects of the CF(3) substituents. The oxidation and reduction potentials for the micro-oxo dimer are significantly more positive compared to those observed for the reference micro-oxo dimer of the iron porphycenes and porphyrins having no electron-withdrawing substituent. Moreover, the (1)H and (19)F NMR spectra of [FePc(EtioCF(3))](2)O demonstrated that the micro-oxo dimer is readily converted into the monomeric ferrous complex in pyridine-d(5) 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.
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