Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

Abstract

Among the metal-based nanoparticles, silver nanoparticles catalysis has been of great interest in organic synthesis and has expanded rapidly in the past ten years because of nanosilver catalysts' unique reactivity and selectivity, stability, as well as recyclability in catalytic reactions. As can be seen from the research results reported in this critical review, the application of heterogeneous silver-based nanoparticles to general organic reactions has proved to be an effective strategy in the development of highly efficient organic transformations in term of efficiency and selectivity. In particular, this review revealed the powerful potential of nanosilver catalysis in total synthesis of natural products and pharmaceutical molecules.

Ag Nanoparticles-Based Zinc Hydroxide-Layered Hybrids as Novel and Efficient Catalysts for Reduction of 4-Nitrophenol to 4-Aminophenol

“…4,8,9,14 Moreover, the color of the AgNPs/ZHL hybrids is yellow-green, which is different to that of the pure ZHL compound (see the inset of Figure 1b). They are similar to those reported in the literature, 5,9,16 indicating the existence of AgNPs in AgNPs/ZHL hybrids. The content of Ag nanoparticles on the ZHL host is about 0.7 and 1.8 wt.% for the AgNPs(1)/ZHL and AgNPs(2)/ZHL hybrids, respectively, investigated by X-ray photoemission (see below).…”

“…Ag nanoparticles were chosen because they were cheaper as compared to other noble metal catalysts such as Au and Pt. 1,2,5,9,10 Finally, the catalytic activities of AgNPs/ZHL hybrids were investigated for the reduction of 4-nitrophenol to 4-aminophenol in presence of NaBH 4 . These materials exhibited high catalytic activity and they could be easily reused several times.…”

“…1,3,4 In special, silver nanoparticles (AgNPs) have become a central topic of academic and industrial interest as a promising candidate for next-generation nanocatalysts. 5 AgNPs were the first one of metal nanocatalysts to be employed for the reduction of 4-NP to 4-AP in presence of NaBH 4 . 6 However, metal NPs are generally unstable due to their large active surface areas, so preventing their selfaggregation, which causes a huge drop in a catalytic activity, is critical for practical use.…”

“…[1][2][3] Among them, the borohydride reduction of 4-NP to 4-AP by metal nanoparticles such as Ag, Au, Pt and Cu is particularly attractive because this reaction can be performed in aqueous solution under mild condition. [1][2][3][4][5][6][7][8][9][10] Metal nanoparticles (NPs) have a variety of interesting properties, which enable them to play significant roles in a broad range of optic-electronic, biochemical and catalytic applications. 1,3,4 In special, silver nanoparticles (AgNPs) have become a central topic of academic and industrial interest as a promising candidate for next-generation nanocatalysts.…”

Continuous synthesis of tuneable sized silver nanoparticles via a tandem seed-mediated method in coiled flow inverter reactors

“…8 In addition, silver nanoparticles are particularly attractive as industrial catalysts due to their relatively low price, approximately 1/50 of the price of gold or platinum and 1/25 of the price of palladium. 9 Size-controlled silver nanoparticles is usually difficult to achieve in batch synthetic systems due to the simultaneous agglomeration taking place. 10 Due to this reason, most synthetic procedures include the addition of steric stabilizing agents, such as polyvinylpyrrolidone (PVP) or polyvinyl alcohol (PVA) which avoids the agglomeration of the particles but at the same time limits the controlled variability of the size.…”