• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Lanthanide-supported molybdenum-vanadium oxide clusters: syntheses, structures and catalytic properties
【24h】

Lanthanide-supported molybdenum-vanadium oxide clusters: syntheses, structures and catalytic properties

机译：镧系元素负载的钼-钒氧化物簇：合成，结构和催化性能

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

Three new lanthanide-supported molybdovanadates [Ln(H2O)(5)](2)Mo6V2O26 center dot 8H(2)O (Ln - La 1; Ce 2; Nd 3) have been synthesized by the reaction of the [Mo6V2O26](6-) anion with Ln(NO3)(3) in aqueous solution and characterized by elemental analysis, IR, solid state UV-vis spectroscopy, thermal gravimetric analysis, powder X-ray diffraction and single-crystal X-ray diffraction. Compounds 1-3 are obtained at the same pH value (3.0) and have similar structural units which consist of one molybdovanadate unit supported by two lanthanide cations. Then, these bi-supporting subunits are joined together by strong hydrogen-bonding interactions between polyoxoanions and coordinated water molecules to form a 3D supramolecular framework. To the best of our knowledge, they represent the first examples of inorganic species constructed from molybdenum-vanadium polyoxometalates and lanthanides. The UV-vis diffuse reflectivity spectra of 1-3 show that they can be regarded as a wide gap semiconductor. Photocatalytic studies indicate that compounds 1-3 are not only active photocatalysts for degradation of rhodamine B, but very stable and easily separated from the photocatalytic system for reuse as well. Moreover, the new materials were tested as catalysts in cyanosilylation reactions of aldehydes under solvent-free conditions. The experimental results indicate that all three compounds 1-3 can act as Lewis acid-base catalysts through a heterogeneous manner to prompt cyanosilylation with good efficiency.
机译：通过[Mo6V2O26]的反应合成了三种新的镧系元素负载的钼钒酸盐[Ln（H2O）（5）]（2）Mo6V2O26中心点8H（2）O（Ln-La 1; Ce 2; Nd 3） 6-）在水溶液中具有Ln（NO3）（3）的阴离子，并通过元素分析，IR，固态UV-可见光谱，热重量分析，粉末X射线衍射和单晶X射线衍射进行表征。在相同的pH值（3.0）下获得化合物1-3，并具有相似的结构单元，该结构单元由一个由两个镧系元素阳离子负载的钼钒酸盐单元组成。然后，这些双支撑亚基通过聚氧阴离子和配位水分子之间的强氢键相互作用结合在一起，形成3D超分子框架。据我们所知，它们代表了由钼-钒多金属氧酸盐和镧系元素构成的无机物种的第一个实例。 1-3的紫外可见漫反射光谱表明，它们可以被视为宽间隙半导体。光催化研究表明，化合物1-3不仅是用于降解若丹明B的活性光催化剂，而且非常稳定，也很容易从光催化体系中分离出来再利用。此外，在无溶剂条件下，将新材料作为醛在醛的氰基硅烷化反应中的催化剂进行了测试。实验结果表明，三种化合物1-3均可通过非均相方式起到路易斯酸碱催化剂的作用，以促进氰基甲硅烷基化反应。

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