NHC 聚合物颗粒通过自组装和杯[4]芳烃两亲体的点击方法获得，作为催化活性 Pd 纳米团簇的载体。

NHC Polymeric Particles Obtained by Self-Assembly and Click Approach of Calix[4]Arene Amphiphiles as Support for Catalytically Active Pd Nanoclusters.

机构信息

Alexander Butlerov Institute of Chemistry, Kazan Federal University, 18 Kremlevskaya Str., 420008 Kazan, Russia.

A.E.Arbuzov Institute of Organic & Physical Chemistry, 8 Arbuzov Str., 420008 Kazan, Russia.

出版信息

Molecules. 2021 Nov 14;26(22):6864. doi: 10.3390/molecules26226864.

A new polymeric NHC carrier was synthesized by sequential supramolecular self-assembly and copper-catalyzed azide-alkyne cycloaddition (CuAAC) of amphiphilic imidazolium calix[4]arenes with octyl lipophilic fragments. Obtained polytriazole-imidazolium particles were found as monodisperse submicron particles, with the average diameter of 236 ± 34 nm and average molecular weight of 1380 ± 96 kDa. Successful CuAAC polymerization has been proved using IR spectroscopy and high-resolution ESI mass spectrometry. Polymeric particles, as well as aggregates made from precursor macrocycles, were decorated by Pd clusters (2 nm) for further catalytic investigations. Pd nanoclusters, supported on the polymeric surface, were found highly catalytically active in the model reduction of -nitrophenol, giving reaction rates an order of magnitude higher compared to literature examples. The reaction was recycled using the same catalyst five times without any loss of activity.

一种新型的聚合型 NHC 载体是通过两亲性咪唑并[4]芳烃与辛基亲脂片段的顺序超分子自组装和铜催化的叠氮-炔环加成（CuAAC）合成的。所得到的聚三唑-咪唑离子颗粒呈单分散亚微米颗粒，平均直径为 236 ± 34nm，平均分子量为 1380 ± 96kDa。使用红外光谱和高分辨率 ESI 质谱成功证明了 CuAAC 聚合。聚合颗粒以及由前体大环形成的聚集体通过 Pd 簇（2nm）进行了修饰，以便进一步进行催化研究。在模型还原-硝基苯酚的反应中，负载在聚合体表面上的 Pd 纳米簇被发现具有很高的催化活性，反应速率比文献中的例子高一个数量级。在没有任何活性损失的情况下，该反应使用相同的催化剂进行了五次循环回收。