New Iron(III) Oxo Complex with Substituted 2,6-Bis(Pyrazol-3-yl)Pyridine

Abstract

A new binuclear iron(III) oxo complex [(L)FeOFe(L)](PO2F2)4 (1) with PO2F2– counterions resulted from the oxidation of the hexafluorophosphate anion has been prepared by oxidation of an iron(II) complex with the tridentate ligand 2,6-bis(5-(4-fluorophenyl)-1H-pyrazol-3-yl)pyridine (L). According to X-ray diffraction studies, the iron(III) ions adopt the high-spin state, as in the previously described iron(III) oxo complex with tert-butyl substituted bis(pyrazol-3-yl)pyridine. At the same time, the presence of aromatic para-fluorophenyl substituents and $${\text{P}}{{{\text{O}}}_{2}}{\text{F}}_{2}^{ - }$$ counterions in oxo complex 1 decreases the twisting of bis(pyrazol-3-yl)pyridine ligands relative to each other, thus ensuring a less distorted molecular geometry of this complex.