Fe(C₅H₅)₂ — an iron(II) sandwiched between two parallel cyclopentadienyl (Cp⁻) rings. Each Cp donates 6 π electrons (η⁵ binding); together with Fe(II)'s 6 d electrons, the complex is 18-electron and diamagnetic. Discovery (Pauson & Kealy…
Fe(C₅H₅)₂ — an iron(II) sandwiched between two parallel cyclopentadienyl (Cp⁻) rings. Each Cp donates 6 π electrons (η⁵ binding); together with Fe(II)'s 6 d electrons, the complex is 18-electron and diamagnetic. Discovery (Pauson & Kealy…