title: The synthesis and structure of a dianionic species with a bond between pentacoordinated tin atoms: bonding properties of the tin-tin bond.
abstract: The first dianionic compound bearing a bond between two pentacoordinated tin atoms, a distannate, was synthesized in a stable form by using two sets of an electron-withdrawing C,O-bidentate ligand on each tin atom. The structure of the distannate was determined by NMR spectroscopy and X-ray crystallographic analysis. The Sn-Sn bond of the distannate was shown to be a single bond featuring high s-character. The1J(Sn-Sn) coupling constant was larger than that of Sn(sp3)-Sn(sp3) bonds found in most hexaorganodistannanes. This bond feature was also supported by computational studies. The Sn-Sn bond was cleaved by treatment with hydrochloric acid, which shows a different reactivity to the homonuclear bonds of pentacoordinated disilicates and digermanates.
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. kano@chem.s.u-tokyo.ac.jp takayuki@chem.s.u-tokyo.ac.jp.
authors.forename: Satoru
authors.initials: S
authors.lastname: Tsukada
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. kano@chem.s.u-tokyo.ac.jp takayuki@chem.s.u-tokyo.ac.jp.
authors.forename: Nathan J
authors.initials: NJ
authors.lastname: O'Brien
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. kano@chem.s.u-tokyo.ac.jp takayuki@chem.s.u-tokyo.ac.jp.
authors.forename: Naokazu
authors.initials: N
authors.lastname: Kano
authors.affiliation: Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. kano@chem.s.u-tokyo.ac.jp takayuki@chem.s.u-tokyo.ac.jp.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kawashima
authors.affiliation: Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan.
authors.forename: Jing-Dong
authors.initials: JD
authors.lastname: Guo
authors.affiliation: Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nagase