• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Modular Thiol-Ene Chemistry Approach towards Mesoporous Silica Monoliths with Organically Modified Pore Walls
【24h】

Modular Thiol-Ene Chemistry Approach towards Mesoporous Silica Monoliths with Organically Modified Pore Walls

机译：有机修饰的孔壁介孔二氧化硅整体的模块化硫醇-烯化学方法

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The surface modification of mesoporous silica monoliths through thiol-ene chemistry is reported. First, mesoporous silica monoliths with vinyl, allyl, and thiol groups were synthesized through a sol-gel hydrolysis-poly-condensation reaction from tetramethyl orthosilicate (TMOS) and vinyltriethoxysilane, allyltriethoxysilane, and (3-mercaptopropyl) trimethoxysilane, respectively. By variation of the molar ratio of the comonomers TMOS and functional silane, mesoporous silica objects containing different amounts of vinyl, allyl, and thiol groups were obtained. These intermediates can subsequently be derivatized through radical photoaddition reactions either with a thiol or an olefin, depending on the initial pore wall functionality, to yield silica monoliths with different pore-wall chemistries. Nitrogen sorption, small-angle X-ray scattering, solid-state NMR spectroscopy, elemental analysis, thermogravimetric analysis, and redox titration demonstrate that the synthetic pathway influences the morphology and pore characteristics of the resulting monoliths and also plays a significant role in the efficiency of functionalization. Moreover, the different reactivity of the vinyl and allyl groups on the pore wall affects the addition reaction, and hence, the degree of the pore-wall functionalization. This report demonstrates that thiol-ene photoaddition reactions are a versatile platform for the generation of a large variety of organically modified silica monoliths with different pore surfaces.
机译：据报道，通过硫醇-烯化学方法对介孔二氧化硅整体进行表面改性。首先，分别通过原硅酸四甲酯（TMOS）和乙烯基三乙氧基硅烷，烯丙基三乙氧基硅烷和（3-巯基丙基）三甲氧基硅烷通过溶胶-凝胶水解-缩聚反应合成具有乙烯基，烯丙基和硫醇基的介孔二氧化硅整体。通过改变共聚单体TMOS和官能硅烷的摩尔比，获得了包含不同量的乙烯基，烯丙基和硫醇基的中孔二氧化硅物体。这些中间体随后可以根据自由基的孔壁官能度，通过与硫醇或烯烃的自由基光加成反应进行衍生化，以生成具有不同孔壁化学性质的二氧化硅单块。氮吸附，小角X射线散射，固态NMR光谱，元素分析，热重分析和氧化还原滴定表明，合成途径会影响所得整料的形态和孔特征，并且在效率上也起着重要作用功能化。此外，孔壁上乙烯基和烯丙基的不同反应性影响加成反应，因此影响孔壁官能化程度。该报告表明，硫醇-烯光加成反应是用于生成各种具有不同孔表面的有机改性二氧化硅整体的通用平台。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号