Although caesium is well known in its oxidation state +I, many chemists have speculated about a possible higher state. Such a species has not yet been prepared, but based on quantum-chemical calculations CsFn compounds have now been predicted to be stable.
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Riedel, S., Schwerdtfeger, P. Beyond state I. Nature Chem 5, 815–816 (2013). https://doi.org/10.1038/nchem.1767
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DOI: https://doi.org/10.1038/nchem.1767
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