Silicon-29 NMR studies of tetraalkylammonium silicate solutions.: 1.: Equilibria, 29Si chemical shifts, and 29Si relaxation

被引：98

作者：

Kinrade, SD ^{[1
]}

Knight, CTG

Pole, DL

Syvitski, RT

机构：

[1] Lakehead Univ, Dept Chem, Thunder Bay, ON P7B 5E1, Canada

[2] Univ Illinois, Sch Chem Sci, Urbana, IL 61801 USA

来源：

INORGANIC CHEMISTRY | 1998年 / 37卷 / 17期

关键词：

D O I：

10.1021/ic971629e

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The addition of tetraalkylammonium cations to aqueous silicate solutions enhances the abundance of symmetric, cagelike, polysilicate anions including the cubic octamer, Si8O208-. The equilibrium ratio of tetramethylammonium (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 hydration that impedes hydrolysis of the central anion.

引用

页码：4272 / 4277

页数：6

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