Crystal structure of a mixed-valence μ-oxide Sn12 cluster.

Abstract

The mixed-valence μ-oxide Sn12 cluster, deca­carbonyl­tetra-μ4-oxido-hexa-μ3-oxido-tetra­kis­[μ-2,2′-(pyridine-2,6-di­yl)bis(1,1-di­phenyl­ethano­lato)]deca­tin(II)ditin(IV)dimolyb­denum(O)(2 Mo—Sn) toluene hepta­solvate, [Mo2Sn12(C33H27NO2)4O10(CO)10]·7C7H8, has a crystallographically imposed inversion centre. The asymmetric unit also contains three and a half toluene solvent mol­ecules, one of which is disordered about a centre of symmetry. The complex mol­ecule comprises six distinct Sn atom species with four different coordination numbers, namely 3, 4, 5, and 6. The SnII atoms forming the central Sn10O10 core adopt distorted trigonal–pyramidal, square-pyramidal and octa­hedral coordination geometries provided by the μ-oxide atoms and by the O- and N-donor atoms of two pyridinedi­ethano­late ligands. The terminal SnIV atoms have distorted trigonal–bipyramidal coordination geometries, with a μ4-oxide atom and the N atom of a pyridinedi­ethano­late ligand occupying the axial positions, and the Mo atom of a Mo(CO)5 group and the alk­oxy O atoms of a ligand forming the equatorial plane. In the crystal, weak intra- and inter­molecular C—H⋯O hydrogen bonds are observed.