首页 | 本学科首页   官方微博 | 高级检索  
     


Trapping Aluminum Hydroxide Clusters with Trisilanols during Speciation in Aluminum(III)–Water Systems: Reproducible,Large Scale Access to Molecular Aluminate Models
Authors:Dr. Kapil Shyam Lokare  Nicolas Frank  Dr. Beatrice Braun‐Cula  Dr. Itziar Goikoetxea  Prof. Dr. Joachim Sauer  Prof. Dr. Christian Limberg
Affiliation:1. http://www2.hu‐berlin.de/chemie/aglimberg/;2. Humboldt-Universit?t zu Berlin, Institut für Chemie, Berlin, Germany
Abstract:To gain molecular level insights into the properties of certain functions and units of extended oxides/hydroxides, suitable molecular model compounds are needed. As an attractive route to access such compounds the trapping of early intermediates during the hydrolysis of suitable precursor compounds with the aid of stabilizing ligands is conceivable, which was tested for the aluminum(III)/water system. Indeed, trisilanols proved suitable trapping reagents: their presence during the hydrolysis of AliBu2H in dependence on the amount of water used allowed for the isolation of tri‐ and octanuclear aluminum hydroxide cluster complexes [Al32‐OH)3(THF)3(PhSi(OSiPh2O)3)2] ( 1 ) and [Al83‐OH)22‐OH)10(THF)3(p‐anisylSi(OSiPh2O)3)4] ( 2 ). 1 can be regarded as the Al(OH)3 cyclic trimer, where six protons have been replaced by silyl residues. While 2 features a unique [Al83‐OH)22‐OH)10]12+ core. In contrast to most other known aggregates of this type, 1 and 2 can be readily prepared at reasonable scales, dissolve in common solvents, and retain an intact framework even in the presence of excessive amounts of water. This finding paves the way to future research addressing the reactivity of the individual functional groups.
Keywords:aluminum  aluminosilicates  clusters  hydrolysis  siloxides
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号