Nuclear Magnetic Resonance- and Electron Paramagnetic Resonance Spectroscopic Characterization of SN and (SN) Dissolved in [EMIm][OAc].

This work focuses on the reaction mechanism of poly(sulfur nitride) ((SN), (SN)), with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate [EMIm][OAc]. We compare this with the reaction of the IL with SN or its N-labeled form SN, a precursor for the synthesis of (SN) and (SN). After purification of the SN-IL- and SN-IL systems via column chromatography, we characterized the reaction products with H, C, and N nuclear magnetic resonance spectroscopy and with electron spray ionization time-of-flight mass spectrometry. Furthermore, time-resolved electron paramagnetic resonance spectroscopy and time-resolved ultraviolet-visible spectroscopy were carried out. Thus, radical intermediates were detected, which were consumed with reaction time. Finally, we postulate a reaction mechanism for the SN-IL- and SN-IL systems and compare this with the respective data for the (SN) -IL- and (SN)-IL-systems.