Quaternary ammonium cation - Wikipedia
Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR + 4, R being an alkyl group or an aryl group. Unlike the ammonium ion (NH +4) and the primary, secondary, or tertiary ammonium cations, the quaternary ammonium cations are permanently charged, independent of the pH of their solution. ...
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