Synthesis, X-ray crystal structure and magnetic properties of the six-coordinated intermediate-spin iron(II) complex [Fe(η5-C5Me5)(η2-Ph2PCH2CH2PPh2)(σ-OCMe2]+CF3SO3–

Abstract

The σ-acetone complex [Fe(η⁵-C₅Me₅)(η²-dppe)(σ-OCMe₂)]⁺ OSO₂CF₃^–, (2 dppe = Ph₂PCH₂CH₂PPh₂) is cleanly synthesised by treatment of the hydride compound [Fe(η⁵-C₅Me₅)(η²-dppe)H]1 with MeOSO₂CF₃ in Et₂O followed by crystallization from acetone–pentane; this compound, characterized by a single crystal X-ray diffraction, exhibits unexpected paramagnetic behaviour for a six-coordinated 18-electron iron(II) organometallic species.