Abstract
We published recently in RSC Advances a paper, reporting a new group of Lewis acidic ionic liquids that were prepared by the combination of 18-crown-6, alkali metal chloride (NaCl or KCl) and metal chloride (FeCl3, AlCl3, ZnCl2) and applied in organic reactions as catalysts.
Highlights
We published recently in RSC Advances a paper,[1] reporting a new group of Lewis acidic ionic liquids that were prepared by the combination of a crown ether (18-crown-6) and alkali metal chloride (NaCl or KCl) and applied in organic reactions as catalysts
This study was developed by following our previous report of crown ether complex cations ionic liquids (CECILs).[2]
Gzaiel et al reported[6] that the vibrational frequency appearing at 261 cmÀ1 is attributed to the anion cluster of [ZnCl4]2À, and that at 283 cmÀ1 can be assigned as the vibration of anion cluster of [ZnCl3$H2O]À
Summary
We published recently in RSC Advances a paper,[1] reporting a new group of Lewis acidic ionic liquids that were prepared by the combination of a crown ether (18-crown-6) and alkali metal chloride (NaCl or KCl) and applied in organic reactions as catalysts. This study was developed by following our previous report of crown ether complex cations ionic liquids (CECILs).[2] The typical structures of new CECILs are described in Fig. 1 (le ). The anion structures were assigned using anionic mass spectra and Raman spectroscopy (Fig. 1, right), indicating the symmetry stretching vibration of M–Clx cluster. The abovementioned assignment was doubted by Małgorzata Swadzba-Kwasny in the comment
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