Zhongwei An, M. Zheng, Yong-sheng Wei
Mar 20, 2012
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Journal
Molecular Crystals and Liquid Crystals
Abstract
Six new magnetic liquid crystals have been prepared, in which trans-bicyclohexyl or trans-cyclohexyl phenyl and biphenyl carboxylic acid phenyl bis-ester mesogenic cores with n-propyl and n-pentyl substituents were terminated by 4-amino-TEMPO (TEMPO=2, 2, 6, 6-tetramethyl piperidine-1-oxyl). All the compounds have been characterized on the basis of their spectral datum. Determined by superconducting quantum interference device (SQUID), electron paramagnetic resonance (EPR), differential scanning calorimeter (DSC), and hot stage polarizing optical microscope (HS-POM), the compounds have both magnetic and liquid crystalline properties. Their temperature ranges of mesophase are about 3.0°C–6.0°C and the susceptibility is 0.137 emu K mol–1 and θ is –5.54 K for 7a between 135 K and 185 K.