SI-29 NMR-STUDIES OF TETRAALKYLAMMONIUM SILICATE SOLUTIONS - 1 - EQUILIBRIA, SI-29 CHEMICAL-SHIFTS, AND SI-29 RELAXATION

Authors
KINRADE SD KNIGHT CTG POLE DL SYVITSKI RT
Citation
Sd. Kinrade et al., SI-29 NMR-STUDIES OF TETRAALKYLAMMONIUM SILICATE SOLUTIONS - 1 - EQUILIBRIA, SI-29 CHEMICAL-SHIFTS, AND SI-29 RELAXATION, Inorganic chemistry, 37(17), 1998, pp. 4272-4277
Citations number
45
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Inorganic chemistry → ACNP
ISSN journal
00201669
Volume
37
Issue
17
Year of publication
1998
Pages
4272 - 4277
Database
ISI
SICI code
0020-1669(1998)37:17<4272:SNOTSS>2.0.ZU;2-D
Abstract
The addition of tetraalkylammonium cations to aqueous silicate solutio ns enhances the abundance of symmetric, cagelike, polysilicate anions including the cubic octamer, Si8O208-. The equilibrium ratio of tetram ethylammonium (TMA) cations to the octameric silicate anion is 8:1 for solutions with a concentration ratio [OH-]:[Si] greater than or equal to 1:1. Evidence indicates that organocations directly associate with cagelike polyanions to form a protective shell of hydrophobic hydrati on that impedes hydrolysis of the central anion.