Dichlorido{μ3-6,6′-dieth­oxy-2,2′-[ethane-1,2-diylbis(nitrilo­methyl­idyne)]diphenolato}octa­methyldi-μ3-oxido-tetra­tin(IV)

In the title tetra­nuclear tin(IV) complex, [Sn4(CH3)8(C20H22N2O4)Cl2O2], there are three completely different tin-atom coordinations. One metal atom (site symmetry 2) adopts a distorted penta­gonal-bipyramidal SnC2N2O3 coordination arising from the N,N′,O,O′-tetra­dentate deprotonated Schiff base, two methyl groups in the axial sites and a μ3-O atom that also bonds to two further Sn atoms. Two symmetry-equivalent Sn atoms adopt very distorted SnC2O4 arrangements that could be described as penta­gonal-bipyramidal with one equatorial vertex missing and the C atoms in the axial site. The final Sn atom (site symmetry 2) adopts an SnC2Cl2O trigonal-bipyramidal arrangement, with Cl atoms in the axial sites. As well as the two Sn atoms, one O atom lies on a twofold rotation rotation axis, and another is disordered about the axis. The terminal eth­oxy group is disordered over two sets of sites with equal occupancy