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Synthesis and comparative study of catalytic activity between Pd-metallodendrimer and Pd/Cu-bimetallodendrimer nanoparticle-based on triazine
Journal of Saudi Chemical Society ( IF 5.8 ) Pub Date : 2019-09-26 , DOI: 10.1016/j.jscs.2019.09.008
Sayedul Islam , Wahab Khan

Triazine-based heterogeneous Pd/Cu-bimetallodendrimer Nanoparticle (Pd/Cu-BMDNP) has been synthesized by sequential loading method from palladium containing metallodendrimer (Pd-MD) which was prepared by the reaction of 2,4,6-Triamine-1,3,5-triazine (melamine) with substituted benzoyl chloride using (Ph3P)2PdCl2 in DMSO at 90 °C. SEM and EDX of Pd/Cu-BMDNP showed the nanosized aggregated spherical surface morphology and the presence of Palladium and copper of the NP. Also, the phase was detected as Face Centered Cubic (FCC) structure by XRD analysis. In addition, the average particle size of Pd/Cu bimetallic catalyst was identified as 12–13 nm by TEM investigation. Greater thermal stability of Pd/Cu-BMDNP than Pd-MD was detected from TG and DSC experiments. The Pd-metallodendrimer has been also characterized by IR, 1H NMR, 13C NMR, SEM, EDX, Mass, TG and DSC techniques. The simple recoverability, high reusability, low amount of catalyst loading, negligible amount of catalyst leaching of the heterogeneous Pd/Cu-BMDNP have made more effective catalyst than homogeneous Pd-metallodendrimer for the C–C cross-coupling reaction such as Heck, Glaser, Sonogashira and Suzuki-Miyaura in excellent yields.



中文翻译:

基于三嗪的Pd-金属树枝状大分子与Pd / Cu-双金属树枝状大分子纳米粒子的合成及催化活性的比较研究

通过顺序加载法,由含钯的金属树枝状大分子(Pd-MD)通过2,4,6-三胺-1的反应制备了三嗪基异质Pd / Cu-双金属树枝状大分子纳米粒子(Pd / Cu-BMDNP),使用(Ph 3 P)2 PdCl 2的3,5-三嗪(三聚氰胺)与取代的苯甲酰氯在90°C下于DMSO中溶解。Pd / Cu-BMDNP的SEM和EDX显示出纳米级聚集的球形表面形态以及NP中钯和铜的存在。此外,通过XRD分析将该相检测为面心立方(FCC)结构。此外,通过TEM研究确定Pd / Cu双金属催化剂的平均粒径为12-13 nm。从TG和DSC实验中发现,Pd / Cu-BMDNP的热稳定性高于Pd-MD。Pd-金属树枝状大分子的特征还在于IR,1 H NMR,13C NMR,SEM,EDX,Mass,TG和DSC技术。简单的可回收性,高可重复使用性,低催化剂负载量,可忽略的异质Pd / Cu-BMDNP催化剂浸出量使H-Cla,Glaser等C-C交叉偶联反应比均相Pd-金属树枝状大分子更有效,Sonogashira和Suzuki-Miyaura的产量很高。

更新日期:2019-09-26
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