High-valent iron halide corroles were examined to determine their reactivity with carbon radicals and their ability to undergo radical rebound-like processes. Beginning with Fe(Cl)-(ttppc) (1) (ttppc = 5,10,15-tris(2,4,6-triphenylphenyl)corrolato 3− ), the new iron corroles Fe(OTf)(ttppc) (2), Fe(OTf)-(ttppc)(AgOTf) (3), and Fe(F)(ttppc) (4) were synthesized. Complexes 3 and 4 are the first iron triflate and iron fluoride corroles to be structurally characterized by single crystal X-ray diffraction. The structure of 3 reveals an Ag I −pyrrole (η 2 −π) interaction. The Fe(Cl)(ttppc) and Fe(F)(ttppc) complexes undergo halogen transfer to triarylmethyl radicals, and kinetic analysis of the reaction between (p-OMe-C 6 H 4 ) 3 C• and 1 gave k = 1.34(3) × 10 3 M −1 s −1 at 23 °C and 2.2(2) M −1 s −1 at −60 °C, ΔH ⧧ = +9.8(3) kcal mol −1 , and ΔS ⧧ = −14(1) cal mol −1 K −1 through an Eyring analysis. Complex 4 is significantly more reactive, giving k = 1.16(6) × 10 5 M −1 s −1 at 23 °C. The data point to a concerted mechanism and show the trend X = F − > Cl − > OH − for Fe(X)(ttppc). This study provides mechanistic insights into halogen rebound for an iron porphyrinoid complex.
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