Paramagnetic ionic liquid crystals: Ion conductive bent-core derivatives of stable radicals

A series of bent-core paramagnetic ionic liquid crystals derived from stable radicals, 6-oxoverdazyl and 1,4-dihydrobenzo[e][1,2,4]triazin-4-yl, and containing the N-methylimidazolium group were prepared and their mesogenic, magnetic and ion conductive properties were investigated. The ion pairs form fluid smectic phases above 100 degrees C, in which ionic layers are separated by paramagnetic layers. Ion conductivity for two selected derivatives is in a range of 10(-5) -10(-8) S cm(-1) and activation energies Ea are about 1.5 eV. Magnetic susceptibility measurements (SQUID) of pristine solid samples revealed liquid-like molecular arrangement in the paramagnetic layers and weak antiferromagnetic interactions. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

A series of bent-core paramagnetic ionic liquid crystals containing the N-methylimidazolium group were prepared and their mesogenic, magnetic, and ion conductive properties were investigated. The ion pairs form fluid smectic phases above 100 degrees C, with ion conductivity ranging from 10(-5) to 10(-8) S cm(-1). Magnetic susceptibility measurements revealed liquid-like molecular arrangement in the paramagnetic layers.