...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Single molecule study of samarium oxide nanoparticles as a purely heterogeneous catalyst for one-pot aldehyde chemistry
【24h】

Single molecule study of samarium oxide nanoparticles as a purely heterogeneous catalyst for one-pot aldehyde chemistry

机译：单分子研究氧化钐纳米粒子作为一个纯粹的非均相催化剂锅醛化学

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

Heterogeneous catalysis holds distinct advantages over homogeneous catalysis; however, it is only truly advantageous if unaffected by metal ion leaching or in situ formation of a soluble catalytically active species. Herein, samarium oxide nanoparticles (Sm2O3NP) were employed as a redox catalyst for the first time, providing a generally applicable route to performing one-pot aldehyde chemistry beginning with an inexpensive and more readily-prepared starting material - an alcohol. The reaction is efficient under mild conditions and does not suffer from over-oxidation of the starting material to its corresponding carboxylic acid. This key asset of the Sm2O3NP catalyst hinges upon a lack of release of free aldehyde into the system. Single molecule fluorescence microscopy revealed that catalysis is restricted to the surfaces of small nanoparticles in a polydisperse nanomaterial, where the product of the oxidative process can be selectively revealed via a subsequent coupling reaction, which occurs without the intermediacy of a free aldehyde. Instead the catalytically active particles act as docking stations, holding the pre-aldehyde until intercepted by a second reagent to complete the oxidation and subsequent reaction in a single step. Coupling this supramolecular strategy to our single molecule approach revealed the interesting nature of the catalytic mechanism and demonstrated that the catalysis is a purely heterogeneous process. Samarium is quite abundant relative to many transition metals (e.g. Ru, Ir, Pt) and thus Sm2O3NP-based nanomaterials may present an opportunity to develop more sustainable catalysts for common organic transformations.
机译：多相催化拥有明显的优势在均相催化;如果不受金属离子影响真正的优势浸出或原位形成的可溶性催化地活跃的物种。氧化物纳米颗粒(Sm2O3NP)被作为一个氧化还原催化剂首次提供普遍适用的路线执行锅醛化学开始一个便宜的和随时准备材料——一个开始酒精。条件和不遭受over-oxidation的起始物料相应的羧酸。取决于缺乏Sm2O3NP催化剂发布免费的醛到系统中。分子荧光显微镜显示催化仅限于表面的小纳米粒子在多分散的纳米材料,的产物氧化过程可以在哪里有选择地显示通过随后的耦合发生反应,而独到自由的醛。活性粒子作为停靠点,pre-aldehyde直到拦截了试剂完成氧化和后续反应在一个单一的步骤。我们的单分子的超分子战略方法揭示了有趣的性质催化机制,证明了催化是一个纯粹的异构的过程。相对于许多钐是相当丰富的过渡金属(如俄罗斯,红外,Pt),因此Sm2O3NP-based纳米材料可能存在一个机会发展更可持续的催化剂常见的有机转换。

著录项

相似文献

  • 外文文献
  • 中文文献
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