Novel Layered Organic-Inorganic Hybrid Materials with Bridged Silsesquioxanes as Pillars

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• 作者：Urbano D&iacute ; az ; Á ; ngel Cant&iacute ; n ; Avelino Corma
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：July 24, 2007
• 年：2007
• 卷：19
• 期：15
• 页码：3686 - 3693
• 全文大小：286K
• 年卷期：v.19,no.15(July 24, 2007)
• ISSN：1520-5002

文摘

Layered organic-inorganic hybrid materials were synthesized by pillaring with viologen and nitroanilinecompounds which are intercalated between magadiite layers. The bridged silsesquioxanes, 4,4'-bis(trimethoxysilylpropyl)viologen and 4-nitro-N,N'-bis(3-trimethoxysilyl)propylaniline react with the surfacesilanol groups of the inorganic layers of silicate, bonding covalently with them. The preparation processwas followed by DRX, and the pillarization was corroborated using chemical and thermogravimetricalanalyses. The presence of viologen and nitroaniline organic linkers covalently bonded to inorganic layerswas confirmed by ¹³C and ²⁹Si NMR spectroscopy. UV-visible diffuse reflectance permitted to observethe high stabilization achieved by the intercalated organic fragments. Micro- and mesoporosity were alsogenerated because of the existence of interlayer galleries conformed by homogenously distributed organiclinkers into the interlayer space. The layered organic-inorganic hybrids exhibited a thermally stablenetwork, and the organic spacers remained after elimination of the swelling agents by acid extraction.The resultant materials can be of interest as sensors and for nonlinear optics.