Gas Conversion Department, Faculty of Petrochemicals, Iran Polymer and Petrochemicals Institute, PO Box 14975-112, Tehran, Iran.
Department of Chemistry, School of Science, Alzahra University, PO Box 1993891176, Vanak, Tehran, Iran.
Carbohydr Polym. 2018 Apr 15;186:25-34. doi: 10.1016/j.carbpol.2018.01.023. Epub 2018 Jan 12.
For the first time, a ternary hybrid system composed of halloysite nanotubes, HNTs, cyclodextrin nanosponges, CDNS, and g-CN is prepared and used for immobilization of Pd(0) nanoparticles and development of a heterogeneous catalyst, Pd@HNTs-CDNS-g-CN for promoting ligand and copper-free Sonogashira and Heck coupling reactions in aqueous media. HNT as a porous tubular clay with outstanding thermal, mechanical and textural properties can act as a support for immobilizing Pd nanoparticles. The role of CDNS can be explained on the base of its capability to form inclusion complexe with substrates and bringing them in the vicinity of the catalytic active sites. Regarding the role of g-CN in catalysis, it is proved that its presence can suppress the Pd leaching dramatically. The contribution of each component as well as synergistic effect between them results in high catalytic activity and recyclability (up to 10 reaction runs) of the catalyst.
首次制备了由埃洛石纳米管（HNTs）、环糊精纳米海绵（CDNS）和 g-CN 组成的三元杂化体系，并将其用于固定 Pd(0)纳米粒子和开发用于促进配体和无铜 Sonogashira 和 Heck 偶联反应的非均相催化剂 Pd@HNTs-CDNS-g-CN 在水介质中。HNT 作为一种具有出色热、机械和结构性能的多孔管状粘土，可用作固定 Pd 纳米粒子的载体。CDNS 的作用可以基于其与底物形成包合物的能力以及将它们带到催化活性位点附近来解释。关于 g-CN 在催化中的作用，已证明其存在可以显著抑制 Pd 的浸出。各组分的贡献以及它们之间的协同作用导致催化剂具有高催化活性和可循环使用性（多达 10 次反应）。
