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首页> 外文期刊>RSC Advances >Green synthesis of graphene oxide (GO)-anchored Pd/Cu bimetallic nanoparticles using Ocimum sanctum as bio-reductant: an efficient heterogeneous catalyst for the Sonogashira cross-coupling reaction
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Green synthesis of graphene oxide (GO)-anchored Pd/Cu bimetallic nanoparticles using Ocimum sanctum as bio-reductant: an efficient heterogeneous catalyst for the Sonogashira cross-coupling reaction

机译：使用Eximum Sanctum作为生物还原剂的石墨烯氧化物（GO）氧化物（GO）氧化物（GO）-Achione的Gimetallic纳米粒子：Sonogashira交叉偶联反应的有效异质催化剂

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To explore the synergism between two metal centers we have synthesized graphene oxide (GO) supported Pd/Cu@GO, Pd@GO and Cu@GO nanoparticles through bio-reduction of Pd(NO _(3) ) _(2) and CuSO _(4) ·5H _(2) O using Tulsi ( Ocimum sanctum ) leaf extract as the reducing and stabilizing agent. The graphene oxide (GO) was obtained by oxidation of graphite following a simplified Hummer's method. The as-prepared nanomaterials have been extensively characterized by FTIR, powder X-ray diffraction (PXRD), HRTEM, TEM-EDS, XPS, ICP-AES and BET surface area measurement techniques. The morphological study of Pd/Cu@GO revealed that crystalline bimetallic alloy type particles were dispersed on the GO layer. The activity of Pd@GO, Cu@GO and Pd/Cu@GO as catalysts for the Sonogashira cross-coupling reaction have been investigated and it was found that the Pd/Cu@GO nanostructure showed highly superior catalytic activity over its monometallic counterparts, substantiating the cooperative influence of the two metals. The inter-atom Pd/Cu transmetalation between surfaces was thought to be responsible for its synergistic activity. The catalyst showed higher selectivity towards coupling of aryl iodides with both aliphatic and aryl alkynes resulting in moderate to excellent isolated yield of the desired products (45–99%). The products have been characterized by GC-MS and ~(1) H-NMR spectroscopic techniques and compared with authentic samples. The Pd/Cu@GO catalyst could be easily isolated from the reaction products and reused for up to at least ten successive runs effectively.
机译：为了探讨两种金属中心之间的协同作用，我们已经合成了石墨烯氧化物（GO）PD / Cu @ Go，Pd @ Go和Cu @ Go anoparticly通过生物减少PD（No _（3））_（2）和cuso _（4）·5H _（2）o使用Tulsi（Ocimum Sanctum）叶提取物作为还原和稳定剂。通过在简化的悍马方法之后通过氧化石墨来获得石墨烯（GO）。由FTIR，粉末X射线衍射（PXRD），HRTEM，TEM-EDS，XPS，ICP-AES和BET表面积测量技术进行了广泛的表征。 PD / Cu @的形态学研究显示，将结晶双金属合金型颗粒分散在GO层上。 PD @ Go，Cu @ Go和Pd / Cu @的活性已经研究了Sonogashira交叉偶联反应的催化剂，发现Pd / Cu @ Go纳米结构在其单一的单金属对应物上显示出高度优异的催化活性，确保两种金属的合作影响。表面之间的原子间Pd / Cu传递被认为是其协同活动的原因。催化剂对芳族碘化物与脂族和芳基炔烃偶联的选择性更高，导致所需产物的中等至优异的分离产率（45-99％）。该产品的特征在于GC-MS和〜（1）H-NMR光谱技术，并与真实样品进行比较。 PD / Cu @ Go催化剂可以容易地从反应产物中分离出来，并重复使用至少十个连续运行。

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