Synergistic effect of copper nanocrystals-nanoparticles incorporated in a porous organic polymer for the Ullmann C-O coupling r eaction

A covalent organic framework with electrodeposited copper nanoparticles – a desirable catalyst for the Ullmann coupling reaction

“…More recently, Hassan and coworkers developed a quinoxaline-based mesoporous organic polymer (Q-POP) to immobilize Cu(0) nanoparticles. With a catalyst loading of 3 mol% (7.3 wt% Cu), they obtained a 90-100% yield in 24 h at 110 C. 74 Compared to this mesoporous polymer and other catalysts, our electrochemically prepared Cu@COF shows This journal is © The Royal Society of Chemistry 2022 better activity (Table S1 †). From a Cu@COF loading of 0.25 mol% (3.34 wt% Cu), which is signicantly lower than those reported in the literature (Table S1 †), we obtained a yield of 90-99% for a wide variety of substrates from reactions conducted at 135 C in 24 h. We have coupled the crystallinity of the COF (favors easy diffusion and mass transfer) with the stability of its non-hydrolyzable polymeric backbone in this study.…”

“…The Cu@polymer, at a loading of 3 mol%, gave a 90-100% yield of products at 110 C for 24 h. Notably, the catalyst supported on this stable polymer enabled catalyst recyclability, and no drop in its activity was observed even aer 5 cycles. 74 These ndings are testimonies of the advantages of Cu/Cu-oxide nanoparticles supported on a porous matrix as catalysts for Ullmann coupling.…”

Investigation into the Re-Arrangement of Copper Foams Pre- and Post-CO2 Electrocatalysis

“…Copper is an important CO 2 reduction catalyst due to its unique properties; until 2018, it was the only metal reported capable of generating higher value products than carbon monoxide (CO) and formate from CO 2 in appreciable quantities [12][13][14][15]. Therefore, the use of copper as an electrocatalyst for CO 2 reductions is widely extended, employing solid copper surfaces [16][17][18][19], copper foil [20][21][22][23], copper nanoparticles [24][25][26], copper nanocrystals [27][28][29], or hollow copper metal-organic framework (MOF) [30][31][32]. However, frequently, they are sensitive to minor contaminants present in water or bicarbonate solution [33][34][35][36], requiring extensive purification of both the copper surface and reaction medium before electrocatalysis.…”

Investigation into the Re-Arrangement of Copper Foams Pre- and Post-CO2 Electrocatalysis

“…Copper is an important CO2 reduction catalyst due to its unique properties; until 2018 it was the only metal reported capable of generating higher value products than carbon monoxide (CO) and formate from CO2 in appreciable quantities [12][13][14][15]. Therefore, the use of copper as an electrocatalyst for CO2 reductions is widely extended, employing solid copper surfaces [16][17][18][19], copper foil [20][21][22][23], copper nanoparticles [24][25][26], copper nanocrystals [27][28][29], or hollow copper metal-organic framework (MOF) [30][31][32]. However, frequently, they are sensitive to minor contaminants present in water or bicarbonate solution [33][34][35][36], requiring extensive purification of both the copper surface and reaction medium before electrocatalysis.…”