Influence of the Anion Nature on the Depth of Resonance in the 2(4)-Octylaminopyridine Cation

Based on the results of studying 2(4)-octylaminopyridine salts (2(4)-OAP) by physical methods, the specifics of interionic interaction in associates with inorganic anions are discussed. The redistribution of electron density in the aromatic cation, depending on the nature of the anion, is associated with the observed disturbances in the exchange-extraction series of anions and the selectivity of the extraction of “soft” (according to Pearson) 2(4)-OAP anions from aqueous media.