Catalyzed Schiff Base synthesis over Bifunctinalized Cobalt/Zinc-Incorporated Mesoporous Silica Nanoparticles under UV irradiation
Authors
Abstract:
A novel series of the Co/Zn-MSN catalysts with Si/Zn molar ratio of 10 and 1, 3, 5 and 7 wt% Cobalt (denoted by CZ-X-MSN) were synthesized using post-synthesis methods. The samples were characterized by XRD, SEM, FTIR, TEM and nitrogen sorption methods. With a constant Si/Zn ratio, the increase of cobalt species from 1 to 7 wt% led to decrease the catalysts surface area from 408 m2g-1 for CZ-1-MSN to 322 m2g-1 for CZ-7-MSN. The catalyst activities were investigated for Schiff base synthesis by the reaction of cyclohexanone with 2,4-dinitrophenylhydrazine under UV irradiation. The activity of the catalysts in the Schiff base synthesis followed the order of Zn-MSN-10 < CZ-1-MSN < CZ-7-MSN < CZ-3-MSN < CZ-5-MSN. The CZ-5-MSN sample exhibited the highest performance with the conversion and selectivity of cyclohexanone to the Schiff base product were 98 and 97%, respectively, under UV light at 298 K for 10 min. The superior catalytic performance of CZ-5-MSN includes high yield, low reaction temperature, short reaction time and friendly environment. This probably was related to stronger metal-support interaction and metals dispersion. This study provides the new perspective on the synthesis of CZ-X-MSN towards an excellent performance of Schiff base structure under UV irradiation.
similar resources
Synthesis and Characterization of Functionalized SBA-15 Mesoporous Silica by N, N´-Bis(salicylidene)ethylenediamine Schiff-Base
In this work, BSEA-SBA-15 was prepared for the first time, which was prepared by covalently anchoring Schiff-base compound (N,N´-bis(salicylidene)ethylenediamine (BSEA) on SBA-15 by hydrothermal method. The structure and physicochemical properties were determined by elemental analysis, XRD, nitrogen adsorption–desorption, thermogravimetric analysis and FTIR spectroscopy, SEM, BET surface area a...
full textNatural Acid Catalyzed Synthesis of Schiff Base under Solvent-free Condition: As a Green Approach
The reaction of primary aromatic amines with aryl aldehydes is found to be catalyzed by lemon juice as natural acid under solvent-free conditions to give the corresponding Schiff bases in good yields. This eco-friendly reaction has many advantages like economical, environmental, mild reaction conditions and simple work-up with high product yield.
full textSynthesis of electron-poor N-Vinylimidazole derivatives catalyzed by Silica nanoparticles under solvent-free conditions
Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and acetylenic esters, by NH-acids such as azathioprine, imidazole or theophylline leads to the formation of vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce phosphorus ylides. Silica nanoparticles (silica NPs were prepared by therm...
full textSynthesis of electron-poor N-Vinylimidazole derivatives catalyzed by Silica nanoparticles under solvent-free conditions
Protonation of the highly reactive 1:1 intermediates, produced in the reaction between triphenylphosphine and acetylenic esters, by NH-acids such as azathioprine, imidazole or theophylline leads to the formation of vinyltriphenylphosphonium salts, which undergo a Michael addition reaction with a conjugate base to produce phosphorus ylides. Silica nanoparticles (silica NPs were prepared by therm...
full textCyclodextrin-assisted synthesis of tailored mesoporous silica nanoparticles
Mesoporous silica nanoparticles (MSNs) have sparked considerable interest in drug/gene delivery, catalysis, adsorption, separation, sensing, antireflection coatings and bioimaging because of their tunable structural properties. The shape, size and pore structure of MSNs are greatly influenced by the type of additives used, e.g., solvent and pore-templating agent. Here, we studied the influence ...
full textUltrabright fluorescent mesoporous silica nanoparticles.
The first successful approach to synthesizing ultrabright fluorescent mesoporous silica nanoparticles is reported. Fluorescent dye is physically entrapped inside nanochannels of a silica matrix created during templated sol-gel self-assembly. The problem of dye leakage from open channels is solved by incorporation of hydrophobic groups in the silica matrix. This makes the approach compatible wit...
full textMy Resources
Journal title
volume 9 issue 4
pages 712- 722
publication date 2019-10-01
By following a journal you will be notified via email when a new issue of this journal is published.
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023