The name "nitronium" has been used for the cation; even though this cation can be named "nitrylium" by applying Rule C-83.1 of the IUPAC Nomenclature of Organic Chemistry to the radicals given by Recommendation I- of the IUPAC Nomenclature of Inorganic Chemistry , the name nitronium cannot be used for without ambiguity because of this previous usage.

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