Triple Ions and Higher Aggregates Formed in Nonaqueous Solutions

Triple Ions and Higher Aggregates Formed in Nonaqueous Solutions 

When the dielectric constant of the nonaqueous solvent goes below about 15, ions can associate not only in ion pairs but also in ion triplets. This comes about by one of the ions (e.g., M )ofan ion pairM -A Coulombically attracting a free ion A strongly enough to overcome the thermal forces of dissociation 

From the conductance point of view, ion pairs and triple ions behave quite differently. The former, being uncharged, do not respond to an external field the latter are charged and respond to the external field by drifting and contributing to the conductance. 

The extent of ion-pair formation is governed by the equilibrium between free ions and ion pairs, hi like fashion, the extent of triple-ion formation depends on the equilibrium between ion pairs and triple ions. 

the greater the stoichiometric concentration, the greate is the ion-pair formation and triple-ion formation. 

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