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Positive and Negative Ionic Centres in a Single Structure Rule C-87

87.1 - When positive and negative ionic centres are present in a single structure, the compound is named by giving the name of the cationic group directly before that of the anionic group. This can be done (a) by considering that a cationic group, designated by a prefix, is substituted into an anion, the names of cationic substituents being formed by changing the ending "-ium" of the cation name into "-io", or (b) by considering that an anionic substituent, designated by a suffix, is substituted into a cation.

Examples to Rule C-87.1


(trivial name, betaine, see Rule C-816.1)

See Recommendations'93 R-5.8.5

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