Structures and Mössbauer spectra of phosphido-bridged heterobimetallic complexes CpFe(CO)2(μ-PPh2)W(CO)5 and CpFe(CO)(μ-CO)(μ-PPh2)W(CO)4

Structures of non metal-metal bonded phosphido-bridged heterobimetallic complexes, including CpFe(CO)₂(μ-PPh₂)W(CO)₅ (1-W) and metal-metal bonded CpFe(CO)(μ-CO)(μ-PPh₂)W(CO)₄ (2), were determined by a single crystal X-ray diffraction study. In 1-W, the long distance between Fe and W indicates no metal-metal bond to exist. In 2, a Fe---W bond with bond length 2.851 Å and a semibridging carbonyl with W---C---O angle 153° were observed. Mössbauer spectra of 1-W and 2 were taken at 77 K. Isomer shifts of 1-W and 2 were − 0.0203 mm s⁻¹ and 0. 1917 mm s⁻¹ respectively.