Yolk-shell structured magnetic mesoporous organosilica supported ionic liquid/Cu complex: an efficient nanocatalyst for the green synthesis of pyranopyrazoles

Abstract

The preparation of yolk-shell structured magnetic mesoporous composites is a significant subject between researchers. Especially, modification of theses composites with ionic liquid/metal complex is very important for catalytic processes. In the present study, a novel magnetic methylene-based periodic mesoporous organosilica (PMO)-supported ionic liquid/Cu complex with yolk-shell structure (YS-Fe3O4@PMO/IL-Cu) was prepared via the soft template-assisted method. The TGA, FT-IR, SEM, EDX, XRD, VSM, nitrogen-sorption, and ICP techniques were employed to identify YS-Fe3O4@PMO/IL-Cu. The YS-Fe3O4@PMO/IL-Cu material was applied as a powerful nanocatalyst for the synthesis of pyranopyrazoles under ultrasonic media. The study demonstrated that the YS-Fe3O4@PMO/IL-Cu nanocatalyst is highly recyclable, selective, and effective. The leaching test was performed to investigate the nature of the designed catalyst under the applied conditions.

Amine-containing yolk-shell structured magnetic organosilica nanocomposite as a highly efficient catalyst for the Knoevenagel reaction

“…The second one (about 2%) at 150°C–280°C is due to the elimination of remained CTAB and pluronic P123 surfactants. The third one at 300°C–700°C (about 11%) is corresponded to the removal of grafted propylamine moieties on the shell surface and also incorporated methylene groups in the shell framework ( Figure 8 ) ( Neysi and Elhamifar, 2023 ).…”

“…These nanocomposites have many applications in the areas of drug delivery, catalysis, charge transfer and storage in batteries, solar cells and supercapacitors, adsorbents for gases and pollutants, gene therapy, etc ( Nagaraju et al, 2017 ; Xie et al, 2017 ; Bai et al, 2018 ; Du et al, 2018 ). For example, recently, the YS-structured nanocomposites have been used as catalyst in the synthesis of pyranopyrazoles ( Neysi and Elhamifar, 2023 ), the Chan-Lum coupling reaction ( Shaker and Elhamifar, 2021 ), and the reduction of nitrobenzenes ( Wang et al, 2018 ).…”