Comment on “Lewis acidic ionic liquids of crown ether complex cations: preparation and applications in organic reactions” by Y. Liang, J. Wang, C. Cheng and H. Jing, RSC Adv., 2016, 6, 93546
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In the recently published paper by Liang et al., chlorozincate(ii) anion was identified as [ZnCl3]− based on Raman spectroscopy. According to every textbook and numerous papers, this band corresponds to [ZnCl4]2−.