Synthesis of Dendritic Ligand Assisted Zn/Cu Bimetallic Nanoparticles as a Highly Active Green Catalyst for Chemoselecti
- PDF / 2,472,295 Bytes
- 16 Pages / 595.276 x 790.866 pts Page_size
- 74 Downloads / 182 Views
RESEARCH ARTICLE-CHEMISTRY
Synthesis of Dendritic Ligand Assisted Zn/Cu Bimetallic Nanoparticles as a Highly Active Green Catalyst for Chemoselective Oxidation and Reduction Reaction Sayedul Islam1 · Wahab Khan1 Received: 15 May 2020 / Accepted: 19 August 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract The dendritic ligand 2, 4, 6-tris (di-4-chlorobenzamido)-1, 3, 5-triazine 3 supported Zn/Cu (1:1) 4a, 2, 4, 6-tris (di-4chlorobenzamido)-1, 3, 5-triazine 3 supported Zn/Cu (1:2) 4b, and 2, 4, 6-tris (di-4-chlorobenzamido)-1, 3, 5-triazine 3 supported Zn/Cu (2:1) 4c bimetallic nanoparticles (NPs) were synthesized successfully by following the co-complexation route in which the desired molar ratio of Zn and Cu was confirmed by the obtained results of electron diffraction X-ray and X-ray fluorescence spectroscopy analysis. The average particle size of these NPs was detected as 15–20 nm from transmission electron microscopy investigations and agglomerate spherical surface morphology was found by scanning electron microscopy, whereas the face-centered cubic structure of these bimetallic NPs was observed by X-ray diffraction assessment. Also, the formation of the ligand was proven by IR, 1 HNMR, 13 CNMR, and elemental analysis. Remarkably, the chemoselective oxidation of aromatic alcohols to the corresponding aldehydes or ketones at 25 min and reduction of aromatic nitro substituents to the corresponding aniline at 20 min in aqueous medium at room temperature have been studied by the most effective catalyst Zn/Cu (2:1) 4c NPs among other molar ratios of Zn/Cu (1:1) 4a and Zn/Cu (1:2) 4b NPs under atmospheric air (O2 ) conditions with good to excellent yields. This green catalytic approach of Zn/Cu (2:1) 4c NPs catalytic was easily recovered by simple filtration and recycled at least five consecutive runs without a noticeable loss of its catalytic effectiveness. Keywords Dendritic ligand · Zn/Cu · Bimetallic nanoparticles · Oxidation · Reduction · Chemoselective
1 Introduction One of the most important organic reactions is the oxidation of alcohol which is needed for the synthesis of chemical substrates such as ketones, epoxides, aldehydes, and acids [1, 2]. The oxidation is typically carried out using stoichiometric quantities of oxidants such as permanganate [3], chromate [4], or bromate [5]. Such formal industrial schemes often take time and cannot be recycled [6]. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13369-020-04908-6) contains supplementary material, which is available to authorized users.
B
Wahab Khan [email protected] Sayedul Islam [email protected]
1
Department of Chemistry, Faculty of Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka 1000, Bangladesh
The chemoselective reduction of nitro compounds to the resulting amines is a key technique in the chemical, petroleum, pharmaceutical, and agricultural industries [7]. As a result of the widespread use of amines and their derivatives as intermedia
Data Loading...
