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Hexacoordinate Silicon(IV) Complexes with Si O 6 Skeletons and Multidentate Ligands Derived from Citric Acid or Malic Acid
Author(s) -
Tacke Reinhold,
Bertermann Rüdiger,
Burschka Christian,
Dragota Simona
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400237
Subject(s) - hexacoordinate , chemistry , malic acid , denticity , citric acid , tris , amine gas treating , inorganic chemistry , ammonium , silicate , nuclear chemistry , silicon , medicinal chemistry , crystal structure , crystallography , organic chemistry , biochemistry
Morpholinium meso ‐bis[citrato(3‐)‐ O 1 , O 3 , O 6 ]silicate ( meso ‐ 5 ) and racemic morpholinium bis[citrato(4‐)‐ O 1 , O 3 , O 6 ]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‐)‐ O 1 , O 2 ]silicate (( Λ , S , S , S )‐ mer ‐ 7 ) and tri( n ‐butyl)ammonium ( Λ , S , S , S )‐ mer ‐tris[malato(2‐)‐ O 1 , O 2 ]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 ( 13 C, 15 N, 29 Si). Upon dissolution in water at 20 °C, spontaneous hydrolysis of the λ 6 Si ‐silicate anions was observed.