Local structural changes at the formation of fluoride sols and gels:: A mechanistic study by multinuclear NMR spectroscopy

被引：15

作者：

Koenig, R. ^{[1
]}

Scholz, G. ^{[1
]}

Thong, N. H. ^{[1
]}

Kemnitz, E. ^{[1
]}

机构：

[1] Humboldt Univ, Inst Chem, D-12489 Berlin, Germany

来源：

CHEMISTRY OF MATERIALS | 2007年 / 19卷 / 09期

关键词：

D O I：

10.1021/cm0700293

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：

A multinuclear NMR study using Al-27, F-19, C-13, and H-1 as spin probes was performed (i) to address local structures in solutions of Al(OiPr)(3) in isopropanol and (ii) to monitor the fluorination process passing sols and ending up with wet fluoride gels. On the basis of these findings, a possible reaction pathway could be derived for the sol-gel fluorination process: the first step of the synthesis of X-ray amorphous "high surface" (HS) AlF3. The mechanistic studies performed here give for the first time insights into the formation and changes of local structures of aluminum alkoxide fluoride sols and gels as necessary precursors for the new amorphous fluoride materials.

引用

页码：2229 / 2237

页数：9

共 29 条

[1] Application of an alkoxide sol-gel route for the preparation of complex fluorides of the MAlF4 (M = K, Cs), M3AlF6 (M = Li, Na, K), and Na5Al3Fl4 type [J].