Veisi Hojat, Farokhi Maliheh, Hamelian Mona, Hemmati Saba
Department of Chemistry, Payame Noor University Tehran Iran.
Research Center of Oils and Fats, Kermanshah University of Medical Sciences Kermanshah Iran
RSC Adv. 2018 Nov 14;8(67):38186-38195. doi: 10.1039/c8ra06819d.
High reaction rate and easy availability make green synthesis of metal nanoparticles noticeable. In the present study, gold nanoparticles with wide applications in different fields were synthesized by an ecofriendly method at room temperature using extract as the reducing agent. Properties of the synthesized gold nanoparticles (GNP) were identified by different analytical techniques including: UV-Vis absorption spectroscopy verified presence of Au NPs in the solution while functional groups of its extract and synthesized Au NPs were determined by FT-IR. Its crystalline analysis with a fcc plane was verified by X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) determined elements in the sample. Surface morphology, diverse shapes and sizes of the Au NPs were shown by scanning electron microscopy (SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). Beginning and end destruction temperatures of the Au/ NPs were determined by thermal gravimetric analysis (TGA). The Au nanoparticles were capped with extracts, preventing them from oxidation and agglomeration and were used as an efficient heterogeneous nanocatalyst for a three-component reaction of amines, aldehydes, and alkynes (A coupling). A diverse range of propargylamines were obtained in good yields. Furthermore, the separation and recycling of Au/ NPs was very simple, effective, and economical.
高反应速率和易于获得使得金属纳米颗粒的绿色合成备受关注。在本研究中，使用提取物作为还原剂，在室温下通过一种环保方法合成了在不同领域具有广泛应用的金纳米颗粒。通过不同的分析技术对合成的金纳米颗粒（GNP）的性质进行了鉴定，包括：紫外可见吸收光谱证实了溶液中存在金纳米颗粒，而其提取物和合成的金纳米颗粒的官能团通过傅里叶变换红外光谱（FT-IR）确定。通过X射线衍射（XRD）验证了其具有面心立方平面的晶体分析，能量色散光谱（EDS）确定了样品中的元素。通过扫描电子显微镜（SEM）、原子力显微镜（AFM）和透射电子显微镜（TEM）展示了金纳米颗粒的表面形态、多样的形状和尺寸。通过热重分析（TGA）确定了金纳米颗粒的起始和终止破坏温度。金纳米颗粒用提取物进行了包覆，防止它们氧化和团聚，并用作胺、醛和炔烃三组分反应（A偶联）的高效多相纳米催化剂。以良好的产率获得了多种炔丙胺。此外，金纳米颗粒的分离和回收非常简单、有效且经济。
