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首页> 外文期刊>RSC Advances >Ultrafine Pt nanoparticles supported on a dendrimer containing thiol groups: an efficient catalyst for the synthesis of benzimidazoles and benzothiazoles from benzyl alcohol derivatives in water
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Ultrafine Pt nanoparticles supported on a dendrimer containing thiol groups: an efficient catalyst for the synthesis of benzimidazoles and benzothiazoles from benzyl alcohol derivatives in water

机译：支持含有硫醇组的树枝状聚合物上的超细Pt纳米颗粒：用于合成苯并咪唑和来自苄醇衍生物在水中的苯并咪唑和苯并噻唑的有效催化剂

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摘要

A novel and unique platform was prepared based on a dendrimer containing thiol groups supported on nanosilica (nSTDP), and ultrafine platinum nanoparticles were synthesized and immobilized on the thiol decorated branches of nSTPD. The new catalyst, (Pt-np@nSTDP), was characterized by different techniques such as FE-SEM, TEM, ICP, XPS and DR UV-vis. This heterogeneous catalyst presented an outstanding performance for the synthesis of benzimidazole and benzothiazole derivatives through a reaction between benzyl alcohol derivatives and 2-aminothiophenol or 1,2-phenylenediamine. No requirement for the pre-reduction of catalysts and using water as a green solvent make it an individual catalyst for these reactions. Furthermore, the catalyst can be easily recovered and reused five consecutive times in the production of benzimidazoles and benzothiazoles without significant leaching of Pt and loss of its activity which illustrated the chemical stability of the catalyst during the reaction.
机译：基于含有纳米硅藻（NSTDP）的硫醇基团的树枝状聚合物制备了一种新颖和独特的平台，并在NSTPD的硫醇装饰的硫醇上合成并固定超细铂纳米粒子。 新型催化剂（PT-NP @ NSTDP）的特征在于FE-SEM，TEM，ICP，XPS和UV-VIS等不同的技术。 该非均相催化剂通过苄醇衍生物和2-氨基酚酚或1,2-苯二胺之间的反应呈现了合成苯并咪唑和苯并噻唑衍生物的突出性能。 不需要催化剂的预减，以及使用水作为绿色溶剂，使其成为这些反应的个体催化剂。 此外，催化剂可以容易地回收并在苯并咪唑和苯并噻唑的生产中连续5次重复使用，而不明显浸出Pt和其活性的丧失，其说明了反应过程中催化剂的化学稳定性。

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