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.

中文翻译：

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具有取代的2,6-双（吡唑-3-基）吡啶的新型铁（III）氧配合物

摘要

一种新的双核铁（III）氧络合物[（L）FeOFe（L）]（PO 2 F 2）4（1）与PO ₂ ˚F ₂ ^-抗衡离子导致从六氟磷酸根阴离子已被制备的铁的氧化的氧化（II ）与三齿配体2,6-双（5-（4-氟苯基）-1 H-吡唑-3-基）吡啶（L）形成复合物。根据X射线衍射研究，铁（III）离子采用高自旋态，如先前描述的具有叔丁基取代的双（吡唑-3-基）吡啶的铁（III）氧配合物。同时，存在芳族对-氟苯基取代基和\（{\ text {P}} {{{\ text {O}}} _ {2}} {\ text {F}} _ {2} ^ {-} \）抗氧剂1降低了双（吡唑-3-基）吡啶配体相对于彼此的扭曲，因此确保了该络合物的较小的分子几何形状。