SI-29 MAS NMR OF ALUMINOSILICATE SODALITES - CORRELATIONS BETWEEN CHEMICAL-SHIFTS AND STRUCTURE PARAMETERS

被引：46

作者：

ENGELHARDT, G

LUGER, S

BUHL, JC

FELSCHE, J

机构：

[1] Univ of Konstanz, Germany

来源：

ZEOLITES | 1989年 / 9卷 / 03期

关键词：

Zeolites--Structure;

D O I：

10.1016/0144-2449(89)90023-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The 29Si n.m.r. chemical shifts of 16 sodalites of the general composition M6+x[SiAlO4]6Ax&middotnH2O (M=alkali metal cation, A=OHMIN, anion) cover a range of more than 20 ppm and show linear correlations with the Si-O-Al bond angles and the lattice constants. As a result of the different steric and coordination requirements of the various nonframework constituents, bond-angle variations between 126 and 160° occur, and these can be calculated directly from the chemical shift data. The 29Si chemical shifts and the average Si-O-Al bond angles of Si(4Al) environments in several other zeolites also fit the same type of correlation that has been established here for the sodalites.

引用

页码：182 / 186

页数：5

共 21 条

[1] THE CRYSTAL-STRUCTURES OF ALUMINOSILICATE SODALITES - X-RAY-DIFFRACTION STUDIES AND COMPUTER MODELING [J].