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首页> 外文期刊>Chemistry: A European journal >Stable silanetriols that contain tert-alkoxy groups: Versatile precursors of siloxane-based nanomaterials
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Stable silanetriols that contain tert-alkoxy groups: Versatile precursors of siloxane-based nanomaterials

机译：含叔烷氧基的稳定硅烷三醇：硅氧烷基纳米材料的多功能前体

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摘要

Novel tert-alkoxysilanetriols (ROSi(OH)(3), R=adamantyl and 3-ethyl-3-pentyl) have been prepared from the corresponding tert-alkoxytrichlorosilanes and successfully used as molecular building blocks to produce ordered siloxane-based nanomaterials. Controlled hydrolysis of the alkoxytrichlorosilanes led to the formation of crystalline powders of alkoxysilanetriols that were stable under ambient conditions. Solid-state polycondensation of the alkoxysilanetriols occurred upon heating, which led to the formation of ordered silica-organic nanocomposites with laminated morphologies. On the other hand, silylation of the tert-alkoxysilanetriols with chlorotrimethoxysilane enabled us to synthesize well-defined oligomeric alkoxysilanes (ROSi[OSi(OMe)(3)](3)). Hydrolysis and polycondensation of these oligomers followed by acid treatment gave microporous silica with narrow pore size distributions. Thus, tert-alkoxy groups serve not only as protecting groups of siloxane species to regulate hydrolysis and polycondensation, but also as templates to generate micropores thereby providing unique synthetic pathways for the design of ordered silica-based materials.
机译：从相应的叔烷氧基三氯硅烷制备了新型叔烷氧基硅烷三醇（ROSi（OH）（3），R =金刚烷基和3-乙基-3-戊基），并成功地用作分子构建基来生产有序的硅氧烷基纳米材料。烷氧基三氯硅烷的受控水解导致形成在环境条件下稳定的烷氧基硅烷三醇结晶粉末。加热时发生烷氧基硅烷三醇的固态缩聚，这导致形成有层状形态的有序二氧化硅有机纳米复合材料。另一方面，叔烷氧基硅烷三醇与氯三甲氧基硅烷的甲硅烷基化使我们能够合成定义明确的低聚烷氧基硅烷（ROSi [OSi（OMe）（3）]（3））。这些低聚物的水解和缩聚，然后进行酸处理，得到孔径分布窄的微孔二氧化硅。因此，叔烷氧基不仅用作硅氧烷种类的保护基团以调节水解和缩聚反应，而且还用作产生微孔的模板，从而为设计有序的二氧化硅基材料提供了独特的合成途径。

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