Crystalline hybrid organic–inorganic alumino-silicates

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• 作者：Giuseppe Bellussi ; Angela Carati ; Eleonora Di Paola ; Roberto Millini ; Wallace O’ ; Neil Parker Jr. ; Caterina Rizzo ; Stefano Zanardi
• 关键词：Hybrid ; Alumino-silicates ; Organic– ; inorganic
• 刊名：Microporous and Mesoporous Materials
• 出版年：2008
• 出版时间：1 August 2008
• 年：2008
• 卷：113
• 期：1-3
• 页码：252-260
• 全文大小：860 K

文摘

The synthesis and the physico-chemical characterization of hybrid organic–inorganic crystalline phases referred to as ECS (Eni Carbon Silicate), constituting a new family of organic–inorganic hybrid materials, are described. ECS phases were synthesized in basic medium using 1,4-bis-(triethoxysilyl)-benzene (BTEB), 4,4′-bis-(triethoxysilyl)-biphenyl (BTEBP), 1,4-bis-(2-triethoxysilyl-ethyl)-benzene (BTEEB), 1,3-bis-(trimethoxysilyl)-propane (BTMP) as silica sources, NaAlO₂ as source of alumina and an alkali metal hydroxide (NaOH or KOH). Among the bis-silylated organic precursors, BTEB proved to be the most versatile, since three different crystalline phases (ECS-1 to ECS-3) were obtained by changing the synthesis parameters. The presence of Al is in each case critical, since no crystalline products were obtained without NaAlO₂. The solid products were deeply characterized by XRD, HRTEM, ²⁹Si, ²⁷Al and ¹³C MAS NMR, porosimetry, elemental and thermogravimetric analyses. For one of them, ECS-2, the crystal structure was determined and refined starting from the high resolution synchrotron powder diffraction data. It consists of inorganic layers linked by the phenylene groups and built up by [AlO₄] and [SiO₃C] tetrahedra.