Syntheses, characterizations, and crystal structures of organotin(IV) chloride complexes with 4,4′-bipyridine

The organotin(IV) chlorides R,,SnCl,(n = 3, R = Ph, PhCH2, n-Bu; and n = 2, R = n-Bu, Ph, PhCH2) react with 4,4'-bipyridine (4'4-bpy) to give [(Ph3SnCl)(2)(4,4'-bpy)(1.5)(C6H6)(0.5)] (1), [(PhCH2)(3)-SnCl](2) (4,4'-bpy) (2), [(n-Bu)(3)SnCl](2)(4,4'-bpy) (3), [(n-Bu)(2)SnCl2(4,4'-bpy)] (4), [Ph2SnCl2(4,4'-bpy)] (5), and [(PhCH2)(2)SnCl2(4,4'-bpy)] (6). The new complexes have been characterized by elemental analyses, IR, H-1, C-13, Sn-119 NMR spectroscopy. The structures of (1), (2), (4), and (6) have been determined by X-ray crystallography. Crystal structures of (1) and (2) show that the coordination number of tin is five. In complex (1), two different molecules exist: one is a binuclear molecule bridged by 4,4'-bpy and another is a mononuclear one, only one N of 4,4'-bpy coordinate to tin. Complex (2) contains an infinite 1-D polymeric binuclear chain by weak Sn...Cl intermolecular interactions with neighboring molecules. in the complexes (4) and (6), the tin is six-coordinate, and the 4,4'-bpy moieties bridge adjacent dialkyltin(IV)dichloride molecules to form a linear chain. (C) 2004 Wiley Periodicals, Inc.