Ionic liquid functionalized Fe3O4 core-shell nanoparticles: A magnetically separable Bronsted acid catalyst for the synthesis of polythioamides

In these days, development of multicomponent-based polymerization is gaining much attraction. Keeping this point in view, we synthesized fluorescent conjugated and nonconjugated polythioamide in one-pot using dialdehyde, diamines, and elemental sulfur in presence of IL1-IL2@Fe(3)O(4)NPs as catalyst via Willgerodt-Kindler reaction. Herein, ionic liquid-coated over magnetized iron nanoparticles heterogenous catalyst were synthesized. Catalyst was characterized by Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), and Fourier transform infrared (FTIR) spectroscopy. Polymerization of multicomponent reaction proceeds smoothly in the presence of catalyst at ambient temperature with excellent yield. As magnetic catalyst recovered easily from the reaction mixture, this method shows excessive potential for efficient polymerization approach toward structurally diversified polythioamides. By the development of new magnetic catalyst, we overawed the limitations of multicomponent polymerization such as the poor solubility of polymer, low molecular weight, stoichiometric balance, easy removal of catalyst, and complicated workup. The prepared polythioamides were characterized with H-1-NMR, C-13-NMR, FTIR spectroscopy, and gel permeation chromatography (GPC).

Automated summary

In this study, fluorescent conjugated and nonconjugated polythioamide were synthesized using a one-pot method with dialdehyde, diamines, and elemental sulfur, in the presence of IL1-IL2@Fe(3)O(4)NPs as a catalyst via the Willgerodt-Kindler reaction. A magnetized iron nanoparticles heterogeneous catalyst coated with an ionic liquid was synthesized. The catalyst was characterized by BET, XPS, PXRD, TEM, and FTIR spectroscopy. The multicomponent reaction proceeded smoothly at ambient temperature with excellent yield in the presence of the catalyst. The magnetic catalyst could be easily recovered, indicating the potential of this method for efficient polymerization of structurally diversified polythioamides.