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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Crystallinity-dependence of ionic conductivity in the ion pairs of a multi-interactive anion
Gil Ryeong Lee1, Hiroyoshi Ohtsu, Jinyoung Koo
1The Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), RIST Building 3, 77 Cheongam-Ro, Nam-Gu, Pohang 790-784, South Korea. mkawano@postech.ac.kr.
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.
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