Tris(trimethylsilyl)stannyl alkali derivatives: Syntheses and NMR spectroscopic properties |
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Authors: | Roland Fischer Judith Baumgartner Christoph Marschner Frank Uhlig |
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Institution: | Institut für Anorganische Chemie, Technische Universität Graz, Stremayrgasse 16, A-8010 Graz, Austria |
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Abstract: | Starting from tetrakis(trimethylsilyl)stannane, the tris(trimethylsilyl)stannyl alkali derivatives (Me3Si)3SnM, (M = Li, Na, K, Rb, Cs) were prepared in excellent yields. Reaction with MgBr2 · Et2O afforded bistris(trimethylsilyl)stannyl]magnesium. Reaction products were investigated by means of multinuclear NMR spectroscopy. At low temperatures, coupling of 7Li and 119Sn between (Me3Si)3Sn]− and Li · 3THF]+ (337 Hz) or Li · 12Cr4]+ (275 Hz), was observed. NMR chemical shifts and coupling constants of the stannyl anions exhibit a strong dependency on the nature of the cation, solvent system, concentration and temperature. In addition, the molecular structure of tris(trimethylsilyl)stannyl sodium · 15Cr5 was determined by X-ray crystallography. The Na · 15Cr5]+ and (Me3Si)3Sn]− units are joined by a direct Sn-Na contact, 3.0775(18) Å in length. |
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Keywords: | X-ray crystal structures NMR spectroscopy Alkali stannides Preparation |
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