Syntheses of the (divalent group 14 species)dicarbonyl(cyclopentadienyl) manganese (Salen)M=Mn(CO)(2)(eta 5-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) Angstrom, 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 a-donor and weak ct-acceptor ligand. Crystal data for 2: orthorhombic, P2(1)2(1)2(1), a = 6.972(1) Angstrom, b = 15.678(2) Angstrom, c 19.032(2) Angstrom, alpha = beta = gamma = 90 degrees, V= 2080.3(5) Angstrom (3), T = 173(2) K, Z = 4. Crystal data for 4: triclinic, P (1) over bar, a 8.465(2) Angstrom, b = 9.795(3) Angstrom, c = 13.213(4) Angstrom, alpha = 105.55(3)degrees, beta = 105.15(3)degrees, gamma = 100.84(3)degrees, V= 978.7(5) Angstrom (3), T = 173(2) K, Z = 2.