Abstract
Magnetic Ag-Co and Ag-Ni alloy nanoparticles were prepared through a chemical reduction method using their corresponding [Co(NH3)6]Cl3 and [Ni(C2O4)2]K2 complexes, and AgNO3. In this reaction, hydrazine monohydrate was used as reducing agent. The obtained nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). Ag-Co and Ag-Ni nanoalloys exhibited excellent catalytic performance in the preparation of 1,8-dioxooctahydroxanthenes from the reaction of 5,5-dimethyl-1,3-cycloheanedione (dimedone) with aromatic aldehydes. Catalysts were separated by an external permanent magnet and reused. Both, Ag-Co and Ag-Ni nanoalloys posess antibacterial and antioxidant properties and have no significant effect on DNA cleavage.
Highlights
Binary or multi-metal alloys have attracted growing research interest in recent years in both industrial and laboratory chemical processes due to their unique and novel optical, electrical, and catalytic properties.[1,2,3,4] Alloying two or more metals can improve the mechanical, chemical, electrical, and thermal conductivity properties of pure metals.[5]
Scanning electron microscopy (SEM) images were taken with a MIRA3 FEG-scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) analysis was studied by LEO 1455 VP microscope
The results showed that the reaction using 0.06 g of Ag–Ni nanoalloys or 0.05 g of Ag–Co nanoalloys proceeded in highest yield in ethanol at room temperature
Summary
Binary or multi-metal alloys have attracted growing research interest in recent years in both industrial and laboratory chemical processes due to their unique and novel optical, electrical, and catalytic properties.[1,2,3,4] Alloying two or more metals can improve the mechanical, chemical, electrical, and thermal conductivity properties of pure metals.[5] Among metallic alloys, nanoalloys are gaining increasing importance and have several advantages over their corresponding bulk forms. Silver nanoalloys have many specific properties that make them very attractive and valuable in biomedical areas, catalysis, and magnetic imaging purposes.[10] For instance, Ag–Ni nanoalloys have strong anti-oxidation properties[11] and have been used in the electrocatalytic reduction of benzyl chloride.[12] Ag–Co nanoalloys have the ability to catalyze the oxygen reduction reactions[13] and have been used in catalytic oxidation of formaldehyde.[14]
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