Crystallinity-dependence of ionic conductivity in the ion pairs of a multi-interactive anion†
Abstract
Ammonium and sodium salts (ion pairs) of a multi-interactive tri(4-pyridyl)hexaazaphenalenyl anion (TPHAP−) showed completely different ion-conductive properties depending on the crystal structure. TPHAP columnar crystals showed a high conductivity of 10−3 S cm−1 while retaining their structures even under humid conditions, whereas TPHAP dimer crystals exhibited a conductivity of ∼10−5 S cm−1 with crystallinity deterioration. The main unit structures induced by multi-interactivity realized different water accessibility, which explains the differences in their ion conductivity and stability against humidity.