出典:Wiktionary
出典:『Wiktionary』 (2024/09/10 16:13 UTC 版)
counterion (plural counterions)
出典:Wikipedia
出典:『Wikipedia』 (2010/11/11 06:29 UTC 版)
A counterion is the ion that accompanies an ionic species in order to maintain electric neutrality. In table salt the sodium cation is the counterion for the chlorine anion and vice versa. In a charged transition metal complex, a simple (i.e. non-coordinated) ionic species accompanying the complex is termed the counterion.