ISSN:
0009-2940
Keywords:
Silicon, pentacoordinate
;
λ5Si-Spirosilicate, zwitterionic
;
Citrato(2-)-O3,O4 ligand
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The zwitterionic λ5Si-spirosilicate bis[citrato(2-)-O3,O4][(dimethylammonio)methyl]silicate (4) was synthesized by reaction of (MeO)3SiCH2NMe2 (3) with citric acid (molar ratio 1:2) in acetonitrile at room temperature and isolated, after crystallization from water, as the hydrate 4 . H2O (yield 81%). The crystal structure of 4 . H2O was studied by single-crystal X-ray diffraction. The alcoxide oxygen atoms and central carboxylate oxygen atoms of two citrato(2-) ligands and one carbon atom coordinate to the silicon atom of 4 . H2O. The coordination polyhedron around the pentacoordinate silicon atom (SiO4C framework) can be described as a distorted trigonal bipyramid, the two carboxylate oxygen atoms occupying the axial sites. The λ5Si-silicon(IV) complex 4 also exists in solution (DMSO, H2O).
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19941270911
Permalink