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Dianionic complexes with hexacoordinate silicon(IV) or germanium(IV) and three bidentate ligands of the salicylato(2–) type: Syntheses and structural characterization in the solid state and in solution

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Silicon Chemistry

Abstract

Reaction of tetramethoxysilane or tetramethoxygermane with salicylic acid and morpholine (molar ratio 1:3:2) in tetrahydrofuran yielded morpholiniummer-tris[salicylato(2–)-O1,O3]silicate(mer -5) and morpholiniummer-tris[salicylato(2–)-O1,O3]germanate (mer-8), respectively. Treatment of tetramethoxysilane with 5-chlorosalicylic acid and piperidine (molar ratio 1:3:2) in tetrahydrofuran afforded piperidinium mer-tris[5-chlorosalicylato(2–)-O1,O3]silicate–ditetrahydrofuran (mer-6·2THF). Triethylammonium mer-tris[3-methylsalicylato(2–)-O1,O3]silicate (mer-7) was obtained analogously by reaction of tetramethoxysilane with three molar equivalents of 3-methylsalicylic acid and two molar equivalents of triethylamine in dichloromethane/diethyl ether. The racemic compounds mer-5, mer-6· 2THF,mer-7, and mer-8 were characterized by elemental analyses (C, H, N), single-crystal X-ray diffraction, as well as solid-state (29Si) and solution(1H, 13C, 29Si) NMR studies. The structural characterizationwas complemented by computational studies (HF studies, TZVP level) of thefac- and mer-tris[salicylato(2–)-O1,O3]silicatedianion. In addition, the behavior of mer-7 in solution was studied by VT 1HNMR experiments.

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Authors and Affiliations

  1. Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany

    Oliver Seiler, Christian Burschka, Martin Penka & Reinhold Tacke

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  1. Oliver Seiler
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  2. Christian Burschka
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  3. Martin Penka
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  4. Reinhold Tacke
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Seiler, O., Burschka, C., Penka, M. et al. Dianionic complexes with hexacoordinate silicon(IV) or germanium(IV) and three bidentate ligands of the salicylato(2–) type: Syntheses and structural characterization in the solid state and in solution. Silicon Chemistry 1, 355–365 (2002). https://doi.org/10.1023/B:SILC.0000025573.50788.6c

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