Chemistry of vinylidene complexes. XVI. Crystal and molecular structure of the novel tetranuclear μ2-μ3-bis-vinylidene complex (η2-dppe)PdMn(μ3-Cdouble bond; length as m-dashCHPh)PdMn(μ-Cdouble bond; length as m-dashCHPh)(CO)4Cp2

The crystal and molecular structure of the novel tetranuclear complex (η2-dppe)PdMn(μ3-Cdouble bond; length as m-dashCHPh)PdMn(μ-Cdouble bond; length as m-dashCHPh)(CO)4Cp2 (5) has been investigated. The metal core of 5 is a bent chain Pd(2)–Mn(2)–Pd(1)–Mn(1). The bond distances and angles are Mn(1)–Pd(1) 2.6025(6), Pd(1)–Mn(2) 2.8913(5), Mn(2)–Pd(2) 2.6463(4) Å, Mn(1)–Pd(1)–Mn(2) 140.2(2)°, Pd(1)–Mn(2)–Pd(2) 69.6(1)°. Complex contains two bridging vinylidene ligands coordinated to metal atoms in different ways. The Cdouble bond; length as m-dashC bond lengths are 1.347(4) and 1.372(4) Å in the μ2(η1,η1)-Cdouble bond; length as m-dashCHPh and μ3(η1,η1,η2)-Cdouble bond; length as m-dashCHPh ligands, respectively. The η2-dppe ligand is coordinated to the Pd(2) atom to form the chelate cycle. Each of Mn(1) and Mn(2) atoms is bonded with the η5-C5H5 ring and two CO groups.