Abstract
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−.
Highlights
A paper published recently in RSC Advances reports on a new group of solvate ionic liquids,[1] generated by the combination of a crown ether (18-crown-6), an alkali metal chloride (NaCl or KCl) and a halide-abstracting agent, which was a metal chloride (AlCl3, FeCl3, or ZnCl2).[2]
A multi-technique, multi-phase study on chlorozincate(II) ionic liquids with 1-octyl-3-methylimidazolium, [C8mim]+ and 1-ethyl-3-methylimidazolium, [C2mim]+, cations was carried out.[15]
Identical conclusions were reached in earlier work by Alves et al, published in Journal of Raman Spectroscopy, who stated “there is no experimental result that supports the formation of [ZnCl3]À or [Zn2Cl5]À species, but there are enough experimental data on the formation of [ZnCl4]2À and [Zn2Cl6]2À species in ZnCl2/LiCl melts (.)
Summary
A paper published recently in RSC Advances reports on a new group of solvate ionic liquids,[1] generated by the combination of a crown ether (18-crown-6), an alkali metal chloride (NaCl or KCl) and a halide-abstracting agent, which was a metal chloride (AlCl3, FeCl3, or ZnCl2).[2]. Speciation of chlorozincate anions in ionic liquids – Raman spectroscopy and other techniques vs mass spectrometry
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