study of the Chromonic Liquid-CrystallienPhases of Bis-(N,N-diethylaminoethyl)perylene-3,4,9,10-tetracarboxylic Diimide Dihydrochloride by Polarized Optical Microscopy and ~2H NMR Spectroscopy

摘要

The chromonic liquid-crystalline properties of bis-(N,N-diethylaminoethy)perylene-3,4,9,10-tetracar-boxylic diimide dihydrochlorid in an aqueous solution were investigated by polarized light microscopy and ~2H NMr spectroscopy.Both techniques indicate a narrow I+ N biphasic region and a broad N phase region t concentration ranging from approx 6.9 to approx 30 wt% at room temperature.optical microscopy indicates that a hexagonal M phase exists at higher concentrations.The variation of the I->N+I and N+I-> N transition temperatures with concentration was studied by ~2H NMR spectroscpy.Finally,the effects of temperature and concentration on the order parameter of the N phase were investigated by ~2H NMR using a tetra-deuterated derivative.A value of 0.97 was obtained for the N phase at its upper concentration usgn a tetra-deuterated deirvative.A value of 0.97 was obtained for the phase at its upper concentration limit.