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Dianionic Tris[oxalato(2—)]silicate and Tris[oxalato(2—)]germanate Complexes: Synthesis, Properties, and Structural Characterization in the Solid State and in Solution

✍ Scribed by Oliver Seiler; Christian Burschka; Martin Penka; Reinhold Tacke

Publisher
John Wiley and Sons
Year
2002
Tongue
German
Weight
167 KB
Volume
628
Category
Article
ISSN
0372-7874

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✦ Synopsis

Reaction of tetramethoxysilane with three molar equivalents of oxalic acid and two molar equivalents of 1-(2-hydroxyethyl)pyrrolidine or 1-(2-hydroxyethyl)piperidine in tetrahydrofuran yielded the λ 6 Si-silicates 1-(2-hydroxyethyl)pyrrolidinium tris[oxalato(2Ϫ)]silicate (4) and 1-(2-hydroxyethyl)piperidinium tris[oxalato(2Ϫ)]silicate (5). The related germanium compounds 1-(2-hydroxyethyl)piperidinium tris[oxalato(2Ϫ)]germanate (6) and triethylammonium tris[oxalato(2Ϫ)]germanate (7) were synthesized analogously, starting from tetramethoxygermane and using three molar equivalents of oxalic acid and two molar equivalents of 1-(2-hydroxyethyl)piperidine or triethylamine. Compounds 4Ϫ7 Dianionische Tris[oxalato(2؊)]silicat-und Tris[oxalato(2؊)]germanat-Komplexe: Synthese, Eigenschaften und strukturelle Charakterisierung im Festkörper und in Lösung Inhaltsübersicht. Die Umsetzung von Tetramethoxysilan mit drei Mol-Äquivalenten Oxalsäure und zwei Mol-Äquivalenten 1-(2-Hydroxyethyl)pyrrolidin oder 1-(2-Hydroxyethyl)piperidin in Tetrahydrofuran führte zu den λ 6 Si-Silicaten 1-(2-Hydroxyethyl)pyrrolidinium-tris[oxalato(2Ϫ)]silicat (4) und 1-(2-Hydroxyethyl)piperidinium-tris[oxalato(2Ϫ)]silicat (5). Die verwandten Germanium-Verbindungen 1-(2-Hydroxyethyl)piperidinium-tris[oxalato(2Ϫ)]germanat (6) und Triethylammonium-tris[oxalato(2Ϫ)]germanat (7) wurden auf analoge Weise durch Umsetzung von Tetramethoxygerman mit drei Mol-Äquivalenten Oxalsäure und zwei Mol-Äqui-

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