Chemistry: A European Journal 2013-09-27

Structural design of ionic conduction paths in molecular crystals for selective and enhanced lithium ion conduction.

Makoto Moriya, Daiki Kato, Wataru Sakamoto, Toshinobu Yogo

Index: Chemistry 19(40) , 13554-60, (2013)

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Abstract

The molecular crystals [Li{N(SO2CF3)2}{C6H4(OCH3)2}2] and [Li{N(SO2CF3)2}{C6F2H2(OCH3)2}2] with solid-state lithium ion conductivity have been synthesized by the addition of two equivalents of 1,2-dimethoxybenzene or 1,2-difluoro-4,5-dimethoxybenzene to Li{N(SO2CF3)2}, respectively. Single-crystal X-ray diffraction analysis revealed the formation of ionic conduction paths with an ordered arrangement of lithium ions in these crystal structures, afforded by the self- assembled stacking of molecular-based channels consisting of N(SO2CF3)2 anion and 1,2-dimethoxybenzene frameworks as a result of intermolecular aromatic and hydrogen interactions. These compounds show selective lithium ion conductivity as the anions behave as a component unit of the conduction paths. The relationship between the crystal structure and ionic conductivity of the molecular crystals provides a clue to the development of novel solid electrolytes based on molecular crystals showing fast and selective lithium ion conduction.Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.