Bis{deca­carbonyl­bis­[μ-2,2′-(phenyl­imino)­diethano­lato]ditin(II)ditungsten(0)(2 Sn—W)} hexa­carbonyl­tungsten(0)

In the title 2:1 adduct, [Sn(2)W(2)(C(10)H(13)NO(2))(2)(CO)(10)](2)[W(CO)(6)], the complete hexa­carbonyl­tungsten mol­ecule is generated by a crystallographic inversion centre. The heterometallic mol­ecule features a central Sn(2)O(2) core with essentially equal Sn—O(eth­oxy) bond lengths. The second eth­oxy O and amine N atoms of each N,O,O′-tridentate ligand coordinate to one Sn atom only. The NO(3) donor atoms occupy basal positions and the W atom the apical position in a distorted square-pyramidal geometry for each Sn atom. The W atoms are approximately syn to each other but the central metal core is non-planar [W—Sn⋯Sn—W pseudo-torsion angle = 43.573 (16)°]. One of the carbonyl ligands in the heterometallic mol­ecule is disordered over two orientations with equal occupancies. In the crystal, the heterometallic mol­ecules associate via C—H⋯O inter­actions, forming supra­molecular layers with undulating topology in the ab plane. These stack along the c axis, defining voids which are occupied by the W(CO)(6) mol­ecules.