(Schiff Base) Divalent Group 14 Element Species: Manganese and Iron Complexes (Salen)MMn(CO)₂(η⁵-C₅H₅) (M₁₄ = Ge, Sn, Pb) and (Salen)SnFe(CO)₄

Syntheses of the (divalent group 14 species)dicarbonyl(cyclopentadienyl)manganese (Salen)MMn(CO)2(η5-C5H5) [M = Ge (1), Sn (2), Pb (3)] and [(Salen)tin(II)]tetracarbonyliron (Salen)SnFe(CO)4 (4) are reported. The structures of 2 and 4 were determined by X-ray crystallography. The observed Sn−Mn bond length, 2.4428(7) Å, is the shortest distance observed for this type of bond and corresponds to considerable multiple bonding between these atoms. In complex 4, the iron atom has a slightly distorted trigonal-bipyramidal coordination sphere; the (Salen)tin(II) ligand occupies an axial site, indicating that it functions in this complex as a strong σ-donor and weak π-acceptor ligand. Crystal data for 2: orthorhombic, P212121, a = 6.972(1) Å, b = 15.678(2) Å, c = 19.032(2) Å, α = β = γ = 90°, V = 2080.3(5) Å3, T = 173(2) K, Z = 4. Crystal data for 4: triclinic, P , a = 8.465(2) Å, b = 9.795(3) Å, c = 13.213(4) Å, α = 105.55(3)°, β = 105.15(3)°, γ = 100.84(3)°, V = 978.7(5) Å3, T = 173(2) K, Z = 2.