Abstract
AbstractMorpholinium meso‐bis[citrato(3‐)‐O1, O3, O6]silicate (meso‐5) and racemic morpholinium bis[citrato(4‐)‐O1, O3, O6]silicate (rac‐6) were synthesized by treatment of tetramethoxysilane with citric acid and morpholine (molar ratio 1:2:2 and 1:2:4, respectively). Treatment of tetramethoxysilane with (S)‐malic acid and tri(n‐propyl)amine or tri(n‐butyl)amine (molar ratio 1:3:2) yielded tri(n‐propyl)ammonium (Λ, S, S, S)‐mer‐tris[malato(2‐)‐O1, O2]silicate ((Λ, S, S, S)‐mer‐7) and tri(n‐butyl)ammonium (Λ, S, S, S)‐mer‐tris[malato(2‐)‐O1, O2]silicate ((Λ, S, S, S)‐mer‐8). The hexacoordinate silicon compounds meso‐5·2MeOH, rac‐6·1.73MeOH, (Λ, S, S, S)‐mer‐7, and (Λ, S, S, S)‐mer‐8·2MeCN were structurally characterized in the solid state by single‐crystal X‐ray diffraction and VACP/MAS NMR spectroscopy (13C, 15N, 29Si). Upon dissolution in water at 20 °C, spontaneous hydrolysis of the λ6Si‐silicate anions was observed.
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