Abstract
We report a study of the chromonic liquid-crystalline properties of 2-(N,N-diethyl-N-methylammonium)ethylperylene-3,4-dicarboximide formate (1) in aqueous solution by polarised optical microscopy (POM), 2H nuclear magnetic resonance (NMR) spectroscopy and fluorescence spectroscopy. Compound 1 shows chromonic liquid-crystalline properties at concentrations higher than 4 wt% at room temperature. We showed that fluorescence spectroscopy could be used to determine the concentration-dependent, phase-transition temperatures of this chromonic liquid crystal. The values determined by fluorescence spectroscopy are consistent with the values determined by 2H NMR spectroscopy and POM.
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