Reusable magnetic room-temperature Brönsted acidic ionic liquid: synthesis, characterization and evolution of catalytic and biological properties

We report a novel magnetic ionic liquid (MIL) based on pyridine successfully prepared by a two-step reaction pathway. The prepared MIL was recognized by means of Fourier transform infrared spectroscopy (FT-IR), UV–visible and Raman spectroscopies, thermal analysis (TGA and DTG), magnetic susceptibility measurement, mass spectra (MS), proton NMR ( \(^{1}\hbox {H}\,\hbox {NMR}\) $_{}^1\text{H}\text{NMR}$ ), carbon NMR ( \(^{13}\hbox {C}\,\hbox {NMR}\) $_{}^{13}\text{C}\text{NMR}$ ), Hammett acidity, and CHN elemental analysis. The MIL was shown to be efficient in the synthesis of xanthenediones under solvent-free conditions. In addition, the antibacterial and antifungal activity of the MIL was investigated.