The room temperature conversion of nickel difluoride to hexafluoronickelate(IV) salts of alkali cations
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Add time:08/22/2019 Source:sciencedirect.com
NiF2 was oxidized at ~20 °C, to NiF62− by sunlight or ultraviolet light-irradiated F2 in liquid anhydrous hydrogen fluoride (aHF) containing alkali hydrofluorides AF(HF)x. Quantitative formation of NiF62 can be achieved with strongly basic solutions (e.g., KF:HF molar ratio ~ 1:4). Li2NiF6, which was previously unknown, is the least aHF soluble of the alkali NiF62 salts, and was prepared in high purity.
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