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首页> 外文期刊>RSC Advances >Nickel nanoparticles supported on reduced graphene oxide sheets: a phosphine free, magnetically recoverable and cost effective catalyst for Sonogashira cross-coupling reactions
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Nickel nanoparticles supported on reduced graphene oxide sheets: a phosphine free, magnetically recoverable and cost effective catalyst for Sonogashira cross-coupling reactions

机译：镍纳米粒子在还原的石墨烯片上载体：Sonogashira交叉偶联反应的自由，磁性可回收和成本效果催化剂

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摘要

In this study, we have developed a cost effective and one-pot strategy for the synthesis of a heterogeneous catalyst consisting of a Ni nanoparticle-reduced graphene oxide composite for Sonogashira cross-coupling reactions. Several characterization tools were employed to characterize the Ni nanoparticle-reduced graphene oxide composite, which indicated that magnetic Ni nanoparticles of a size range of 1-4 nm were uniformly anchored on the reduced graphene oxide nanosheets without using any surfactant or stabilizing agent. Different types of aryl halides and phenylacetylenes were coupled under the optimized reaction conditions with excellent yields to give biphenylacetylenes. The ferromagnetic behaviour of the Ni nanoparticle-graphene composite resulted in it being easily separable from the reaction mixture and the composite was reusable, up to six times, without losing its catalytic activity. The fresh as well as the reused catalyst for the Sonogashira cross-coupling reaction was well characterized using analytical techniques which showed that the Ni nanoparticles were well dispersed on the reduced graphene oxide nanosheets without agglomeration, and the size and morphology of the catalyst remained unchanged after use in the catalytic reaction.
机译：在这项研究中，我们开发了一种成本效益和单罐的合成，用于合成由Ni纳米粒子 - 还原的石墨烯氧化物复合物用于Sonogashira交联反应组成的非均相催化剂。使用几种表征工具表征Ni纳米颗粒 - 还原的石墨烯氧化物复合材料，表明尺寸范围为1-4nm的磁性Ni纳米颗粒在不使用任何表面活性剂或稳定剂的情况下均匀地固定在还原的氧化烯氧化物纳米晶片上。在优化的反应条件下偶联不同类型的芳基卤化物和苯乙炔，得到优异的产率，得到联苯基乙炔。 Ni纳米粒子 - 石墨烯复合材料的铁磁性行为导致其容易从反应混合物中可分离，复合材料可重复使用，最多可在不损失其催化活性的情况下进行可重复使用。利用分析技术，清新的Sonogashira交叉偶联反应的REE使用的催化剂的特征在于，所述分析技术表明Ni纳米颗粒很好地分散在还原的石墨烯氧化物纳米晶片上而无附聚，并且在催化剂的尺寸和形态之后保持不变用于催化反应。

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  • 来源
    《RSC Advances》 |2015年第125期|共11页
  • 作者

    Hussain Najrul; Gogoi Pranjal; Khare Puja; Das Manash R.;

  • 作者单位

    North East Inst Sci &

    Technol CSIR Div Mat Sci Jorhat 785006 Assam India;

    North East Inst Sci &

    Technol CSIR Div Med Chem Jorhat 785006 Assam India;

    Cent Inst Med &

    Aromat Plants CSIR Agron &

    Soil Sci Div Lucknow 226015 Uttar Pradesh India;

    North East Inst Sci &

    Technol CSIR Div Mat Sci Jorhat 785006 Assam India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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