Highly chemoselective hydrogenation of nitroarenes catalyzed by 3,6-di(pyridin-2-yl)-1,2,4,5-s-tetrazine capped‑silver nanoparticles in aqueous medium at room temperature

2019 ◽  
Vol 119 ◽  
pp. 62-66 ◽  
Author(s):  
Shounak Ray ◽  
Papu Biswas
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Medium ◽  
Room Temperature ◽  
Chemoselective Hydrogenation

RhNPs/SBA-NH2: a high-performance catalyst for aqueous phase reduction of nitroarenes to aminoarenes at room temperature

2014 ◽  
Vol 4 (6) ◽  
pp. 1813-1819 ◽  
Author(s):  
Saidulu Ganji ◽  
Siva Sankar Enumula ◽  
Ravi Kumar Marella ◽  
Kamaraju Seetha Rama Rao ◽  
David Raju Burri
Keyword(s):  
Aqueous Medium ◽  
Aqueous Phase ◽  
High Performance ◽  
Room Temperature ◽  
Phase Reduction ◽  
Chemoselective Hydrogenation

A RhNPs/SBA-NH2 catalyst with <3 nm sized nanoparticles has been synthesized and used in the chemoselective hydrogenation of nitroarenes at room temperature in aqueous medium with N2H4·H2O with high TOF.

scholarly journals Silver Nanoparticles Catalyzed Synthesis and Antimicrobial Activity of 2-Amino-4H-Chromenes

2021 ◽  
Vol 10 (4) ◽  
pp. 2715-2721
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antifungal Activity ◽  
Aqueous Medium ◽  
Alternaria Alternata ◽  
Room Temperature ◽  
One Pot ◽  
Environment Friendly ◽  
Green Approach ◽  
Operational Simplicity

A simple and one-pot protocol has been developed to synthesize bioactive 2-amino-4H-chromenes by using silver nanoparticles (AgNp) as a catalyst at room temperature in an aqueous medium. This method provides operational simplicity and an environment-friendly green approach. All the synthesized compounds were evaluated for antifungal activity against Alternaria alternata.

scholarly journals Green Biosynthesis of Silver Nanoparticles Using Leaf Extract of Carissa carandas L. and Their Antioxidant and Antimicrobial Activity against Human Pathogenic Bacteria

Biomolecules ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 299
Author(s):  
Reetika Singh ◽  
Christophe Hano ◽  
Gopal Nath ◽  
Bechan Sharma
Keyword(s):  
Silver Nanoparticles ◽  
Pathogenic Bacteria ◽  
Leaf Extract ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Antibacterial Activities ◽  
Effect Of Temperature ◽  
Human Pathogenic Bacteria ◽  
Carissa Carandas ◽  
Antioxidant And Antimicrobial Activity

Carissa carandas L. is traditionally used as antibacterial medicine and accumulates many antioxidant phytochemicals. Here, we expand this traditional usage with the green biosynthesis of silver nanoparticles (AgNPs) achieved using a Carissa carandas L. leaf extract as a reducing and capping agent. The green synthesis of AgNPs reaction was carried out using 1mM silver nitrate and leaf extract. The effect of temperature on the synthesis of AgNPs was examined using room temperature (25 °C) and 60 °C. The silver nanoparticles were formed in one hour by stirring at room temperature. In this case, a yellowish brown colour was developed. The successful formation of silver nanoparticles was confirmed by UV–Vis, Fourier transform infrared (FT-IR) and X-ray diffraction (XRD) analysis. The characteristic peaks of the UV-vis spectrum and XRD confirmed the synthesis of AgNPs. The biosynthesised AgNPs showed potential antioxidant activity through DPPH assay. These AgNPs also exhibited potential antibacterial activity against human pathogenic bacteria. The results were compared with the antioxidant and antibacterial activities of the plant extract, and clearly suggest that the green biosynthesized AgNPs can constitute an effective antioxidant and antibacterial agent.

scholarly journals One-pot green synthesis of gold and silver nanoparticles using Rosa canina L. extract

RSC Advances ◽  
2021 ◽  
Vol 11 (24) ◽  
pp. 14624-14631
Author(s):  
Pablo Eduardo Cardoso-Avila ◽  
Rita Patakfalvi ◽  
Carlos Rodríguez-Pedroza ◽  
Xochitl Aparicio-Fernández ◽  
Sofía Loza-Cornejo ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Aqueous Extract ◽  
Room Temperature ◽  
One Pot ◽  
Gold And Silver Nanoparticles ◽  
Rosa Canina ◽  
Capping Agents

Gold and silver nanoparticles were synthesized at room temperature using an aqueous extract from dried rosehips acting as reducing and capping agents with no other chemicals involved.

Room temperature selective oxidation of aniline to azoxybenzene over a silver supported tungsten oxide nanostructured catalyst

2015 ◽  
Vol 17 (3) ◽  
pp. 1867-1876 ◽  
Author(s):  
Shilpi Ghosh ◽  
Shankha S. Acharyya ◽  
Takehiko Sasaki ◽  
Rajaram Bal
Keyword(s):  
Silver Nanoparticles ◽  
Tungsten Oxide ◽  
Selective Oxidation ◽  
Oxidative Coupling ◽  
Room Temperature ◽  
Heterogeneous Catalysts ◽  
Nanostructured Catalyst ◽  
Important Chemical

Heterogeneous catalysts comprising silver nanoparticles supported on nanostructured tungsten oxide were applied for room temperature oxidative coupling of aniline to azoxybenzene, an important chemical intermediate and a chemical of industrial interest.

Green synthesis of silver nanoparticles using aqueous extract of dried Juglans regia green husk and examination of its biological properties

2017 ◽  
Vol 6 (5) ◽  
Author(s):  
Zahra Abbasi ◽  
Sholeh Feizi ◽  
Elham Taghipour ◽  
Parinaz Ghadam
Keyword(s):  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Aqueous Extract ◽  
Plant Extract ◽  
Room Temperature ◽  
Juglans Regia ◽  
Biological Properties ◽  
Rapid Process

AbstractSilver nanoparticles (AgNPs) have widespread applications. Recently, the synthesis of NPs using plant extract has attracted much attention. In this study, with an easy and rapid process at room temperature, AgNPs were produced by the aqueous extract of dried

Synthesis of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones catalyzed by graphene oxide nanosheets in an aqueous medium: “on-water” synthesis accompanied by carbocatalysis and selective C–C bond cleavage

RSC Advances ◽  
2016 ◽  
Vol 6 (27) ◽  
pp. 22320-22330 ◽  
Author(s):  
Nazia Kausar ◽  
Indranil Roy ◽  
Dipankar Chattopadhyay ◽  
Asish R. Das
Keyword(s):  
Graphene Oxide ◽  
Aqueous Medium ◽  
Room Temperature ◽  
Bond Cleavage ◽  
Graphene Oxide Nanosheets ◽  
Graphene Oxide Nanosheet

Graphene oxide nanosheet catalyzed strategies for construction of 2,3-dihydroquinazolinones and quinazolin-4(3H)-ones starting from anthranilamide and an aldehyde/ketone in aqueous medium at room temperature have been realized.

scholarly journals A Novel Photosynthesis of Carboxymethyl Starch-Stabilized Silver Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
M. A. El-Sheikh
Keyword(s):  
Silver Nanoparticles ◽  
Room Temperature ◽  
Colloidal Solution ◽  
Synthesis Method ◽  
Silver Ions ◽  
Water Soluble ◽  
Synthesis Process ◽  
Carboxymethyl Starch ◽  
Round Shape ◽  
First Time

The water soluble photoinitiator (PI) 4-(trimethyl ammonium methyl) benzophenone chloride is used for the first time in the synthesis of silver nanoparticles (AgNPs). A new green synthesis method involves using PI/UV system, carboxymethyl starch (CMS), silver nitrate, and water. A mechanism of the reduction of silver ions to AgNPs by PI/UV system as well as by the newly born aldehydic groups was proposed. The synthesis process was assessed by UV-vis spectra and TEM of AgNPs colloidal solution. The highest absorbance was obtained using CMS, PI and AgNO3concentrations of 10 g/L, 1 g/L, and 1 g/L, respectively; 40°C; 60 min; pH 7; and a material : liquor ratio 1 : 20. AgNPs so-obtained were stable in aqueous solution over a period of three weeks at room temperature (~25°C) and have round shape morphology. The sizes of synthesized AgNPs were in the range of 1–21 nm and the highest counts % of these particles were for particles of 6–10 and 1–3 nm, respectively.

pH‐Transformed ZnO‐NPs /NaPTS: The First Room‐Temperature Brisk Synthesis of Flavanones in Aqueous Medium

2018 ◽  
Vol 3 (46) ◽  
pp. 13197-13206 ◽  
Author(s):  
Bipin Shinde ◽  
Santosh B. Kamble ◽  
Dattaprasad M. Pore ◽  
Prasad Gosavi ◽  
Amol Gaikwad ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Room Temperature ◽  
Zno Nps
Sign in / Sign up

Export Citation Format

Share Document