An Amphiphilic Mesoporous Polymer Comprising a “built‐in” Imidazolium Ionic Liquid via Nanocasting Method as a Novel Catalyst Support with Combined Prospects

Abstract

An imidazolium based ionic liquid bearing triethylene glycol (TEG) tag was employed as a functional monomer together with divinylbenzene to prepare a novel hydrophilic mesoporous polymer containing ionic liquid functionalities via nanocasting method using SBA‐15 as a hard template. The material was characterized using transmission electron microscopy (TEM), N2 sorption analysis, thermo‐gravimetric analysis (TGA), Fourier‐transform infrared spectroscopy (FT‐IR), elemental analysis (CHN), solid‐state NMR spectroscopy and contact angle measurement. It was found that the hydrophobic/hydrophilic properties of initial template, stepwise addition of monomers and initiator as well as amount of carrier solvent are of the important parameters in preparation of the polymer with uniform pore structure. Benefited from the combined properties such as incorporation of ionic liquid within the pore system of a flexible organic matrix together with its hydrophilic character, the material was found as an appropriate support to generate highly dispersed and very small size of Pd nanoparticles inside the pores. The prepared catalyst in this way, demonstrated outstanding activity, recyclability and high durability in the Suzuki cross‐coupling reaction of varied aryl halides with boronic acids in water as a green reaction medium. The beneficial role of imidazolium ionic liquid in the formation of small and highly active Pd nanoparticles was confirmed with comparative experiments.

Influence of ionic liquid counterions on activity and selectivity of ethylene trimerization using chromium‐based catalysts in biphasic media

“…[24,25] The liquid-liquid biphasic catalysis system has received much attention, and the possibility of using this technology in industrial processes is being investigated by many researchers. [15,26] In recent decades the ILs have attracted much attention because of their extensive applications in organic synthesis, [27][28][29][30][31][32][33] catalytic oligomerization of ethylene, [4,17,25] chemical separation, [34][35][36] material, and energy science. [37,38] For example, the chloroaluminate IL has been used as solvents in ethylene oligomerization reactions in the presence of nickel complexes to overcome the deactivation of the catalyst.…”

Control of selectivity in the preparation of 2-substituted benzoazoles by adjusting the surface hydrophobicity in two solid-based sulfonic acid catalysts

“…As a matter of fact, the control of the hydrophobic/hydrophilic balance in solid catalysts might influence their catalytic performance especially in reactions involving both hydrophobic and hydrophilic reaction partners. Along the line in this hypothesis and with our continuous interest in the tuning and optimization of the hydrophobic/hydrophilic characteristic of catalysts to develop more selective catalysts in recent years, 11 herein, among other possibilities, our purpose is to utilize either ethane-bridged PMO based sulfonic acid ( 1a ) or SBA-15-PrSO 3 H ( 1b ) (Fig. 2) as the catalyst having different surface hydrophobicity in the preparation process of various types of 2-substituted benzoazoles.…”

Improved catalytic performance by changing surface and textural properties of Ru supported bifunctional periodic mesoporous organosilicas in aerobic oxidation of alcohols

“…Interestingly, it was revealed that the presence or absence of plugs inside the mesochannels of BFPMO-IL and simultaneously tuning the hydrophobic/hydrophilic nature of the pores could strikingly affect the selectivity of the reaction toward the formation of aldehydes or carboxylic acids as the main reaction product. 90 However, to the best of our knowledge, the use of plugged/unplugged technology in the design of novel PMOmetal based catalysts in which the chemical functionality, hydrophobic-hydrophilic balance of the catalyst, [91][92][93][94][95][96][97][98][99][100][101][102][103][104][105] and plug properties could be controlled in catalytic applications has been underdeveloped. In this line and considering the advantages of using Ru species, here, we report the preparation of a series of Ru-based catalysts through the immobilization of perruthenate anions into the mesochannels of plugged/unplugged bifunctional PMOs (Ru@BFPMOs) containing imidazolium and ethylene or phenylene bridges, and their application in the aerobic oxidation of a wide range of alcohols.…”