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Catalytic N-oxidation of tertiary amines on RuO2NPs anchored graphene nanoplatelets

机译:第三级胺在RUO2NPS锚定石墨烯纳米片上的催化N-氧化

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摘要

Ultrafine ruthenium oxide nanoparticles (RuO2NPs) with an average diameter of 1.3 nm were anchored on graphene nanoplatelets (GNPs) using a Ru(acac)3 precursor by a very simple dry synthesis method. The resultant material (GNPs-RuO2NPs) was used as a heterogeneous catalyst for the N-oxidation of tertiary amines for the first time. The transmission electron microscopy (TEM) images of the GNPs-RuO2NPs showed the excellent attachment of RuO2NPs on GNPs. The loading of Ru in GNPs-RuO2NPs was 2.68 wt%, as confirmed by scanning electron microscope-energy dispersive spectroscopy (SEM-EDS). The X-ray photoelectron spectrum (XPS) and the X-ray diffraction pattern (XRD) of GNPs-RuO2NPs revealed that the chemical state of Ru on GNPs was +4. After the optimization of reaction conditions for N-oxidation of triethylamine, the scope of the reaction was extended to various aliphatic, alicyclic and aromatic tertiary amines. The GNPs-RuO2NPs showed excellent catalytic activity in terms of yields even at a very low amount of Ru catalyst (0.13 mol%). The GNPs-RuO2NPs was heterogeneous in nature, chemically as well as physically, very stable and could be reused up to 5 times.
机译:通过非常简单的干燥合成方法,使用RU(ACAC)3前体锚定在石墨烯纳米片(GNP)上,将平均直径为1.3 nm的氧化芳族纳米颗粒(RUO2NP)锚定在石墨烯纳米片(GNP)上。首次将所得材料(GNPS-RUO2NP)用作非均质催化剂,以首次氧化三级胺。 GNPS-RUO2NP的透射电子显微镜(TEM)图像显示了RUO2NP在GNP上的出色附着。通过扫描电子显微镜 - 能量色散光谱(SEM-EDS)证实,GNPS-RUO2NPS中RU的负载为2.68 wt%。 GNPS-RUO2NP的X射线光电子光谱(XPS)和X射线衍射图(XRD)表明,GNPS上的RU的化学状态为+4。在优化三乙胺N氧化的反应条件后,将反应范围扩展到各种脂肪族,静脉曲气和芳香胺。 GNPS-RUO2NP即使在非常低的RU催化剂(0.13 mol%)的情况下,其产量也表现出极好的催化活性。 GNPS-RUO2NP本质上是异质的,在化学上和物理上,非常稳定,可以重复使用多达5次。

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