title: (η(4)-Butadiene)Sn(0) Complexes: A New Approach for Zero-Valent p-Block Elements Utilizing a Butadiene as a 4π-Electron Donor.
abstract: Research on zero-valent p-block elements is a recent hot topic in synthetic and theoretical chemistry because of their novel electronic states having two lone pairs in both the s- and p-orbitals. It is considered that σ-donating ligands bearing large substituents are essential to stabilize these species. Herein, we propose a new approach using butadiene as a 4π-electron donor to stabilize zero-valent group 14 elements. During our study to explore the coordination chemistry of stannacyclopentadienyl ligands, unexpected products, in which the tin atom is coordinated by a butadiene in a η(4)-fashion, were obtained. Because butadiene is a neutral 4π-electron donating ligand, the formal oxidation number of the tin atoms of the products should be zero, which is supported by X-ray diffraction analysis and theoretical calculations. A mechanism for the formation of the products is also described.
authors: Department of Chemistry, Graduate School of Science and Engineering, Saitama University , Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan.
authors: Takuya
authors: T
authors: Kuwabara
authors: Department of Chemistry, Graduate School of Science and Engineering, Saitama University , Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan.
authors: Marisa
authors: M
authors: Nakada
authors: Department of Chemistry, Graduate School of Science and Engineering, Saitama University , Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan.
authors: Jumpei
authors: J
authors: Hamada
authors: Fukui Institute for Fundamental Chemistry, Kyoto University , Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan.
authors: Jing Dong
authors: JD
authors: Guo
authors: Fukui Institute for Fundamental Chemistry, Kyoto University , Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan.
authors: Shigeru
authors: S
authors: Nagase
authors: Department of Chemistry, Graduate School of Science and Engineering, Saitama University , Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan.
authors: Masaichi
authors: M
authors: Saito