title: Crystal structure of a mixed-valence μ-oxide Sn12 cluster.
abstract: The mixed-valence μ-oxide Sn12 cluster, deca-carbonyl-tetra-μ4-oxido-hexa-μ3-oxido-tetra-kis-[μ-2,2'-(pyridine-2,6-di-yl)bis(1,1-di-phenyl-ethano-lato)]deca-tin(II)ditin(IV)dimolyb-denum(O)(2 Mo-Sn) toluene hepta-solvate, [Mo2Sn12(C33H27NO2)4O10(CO)10]·7C7H8, has a crystallographically imposed inversion centre. The asymmetric unit also contains three and a half toluene solvent mol-ecules, one of which is disordered about a centre of symmetry. The complex mol-ecule comprises six distinct Sn atom species with four different coordination numbers, namely 3, 4, 5, and 6. The Sn(II) atoms forming the central Sn10O10 core adopt distorted trigonal-pyramidal, square-pyramidal and octa-hedral coordination geometries provided by the μ-oxide atoms and by the O- and N-donor atoms of two pyridinedi-ethano-late ligands. The terminal Sn(IV) atoms have distorted trigonal-bipyramidal coordination geometries, with a μ4-oxide atom and the N atom of a pyridinedi-ethano-late ligand occupying the axial positions, and the Mo atom of a Mo(CO)5 group and the alk-oxy O atoms of a ligand forming the equatorial plane. In the crystal, weak intra- and inter-molecular C-H⋯O hydrogen bonds are observed.
authors.affiliation: Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russian Federation.
authors.forename: Marina M
authors.initials: MM
authors.lastname: Kireenko
authors.affiliation: Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russian Federation.
authors.forename: Kirill V
authors.initials: KV
authors.lastname: Zaitsev
authors.affiliation: Department of Chemistry, M.V. Lomonosov Moscow State University, Leninskie Gory 1/3, Moscow 119991, Russian Federation.
authors.forename: Sergey S
authors.initials: SS
authors.lastname: Karlov
authors.affiliation: N.D. Zelinsky Institute of Organic Chemistry, Leninsky Prospekt 47, Moscow 119991, Russian Federation.
authors.forename: Mikhail P
authors.initials: MP
authors.lastname: Egorov
authors.affiliation: Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii Prospekt 31, Moscow 119991, Russian Federation.
authors.forename: Andrei V
authors.initials: AV
authors.lastname: Churakov
keywords: S12 cluster; carbonyls; crystal structure; stannylenes