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In the title 2:1 adduct, [Sn2W2(C10H13NO2)2(CO)10]2[W(CO)6], the complete hexa­carbonyl­tungsten mol­ecule is generated by a crystallographic inversion centre. The heterometallic mol­ecule features a central Sn2O2 core with essentially equal Sn—Oeth­oxy bond lengths. The second eth­oxy O and amine N atoms of each N,O,O′-tridentate ligand coordinate to one Sn atom only. The NO3 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.
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