Abstract
A series of new azo dye liquid crystals was prepared by the reaction of the N,N-disubstituted-4-aminophenylazobenzaldehydes with butyl cyanoacetate in the presence of piperidine in refluxing ethanol. The new azo dye liquid crystals possess a SmA phase, and representative samples were found to be reasonably photostable.
Notes
Sample SI-426 was purified by chromatography before measuring its photo-stability. 1H NMR (CDCl3): 0.90 (s, 9H, 3CH3), 1.00 (d, J=6.0, 3H, CH3), 1.27 (t, 6H, 2CH3), 1.54–1.90 (m, 5H, 2CH2 +CH), 3.46 (quart, 4H, 2CH2), 4.06 (t, 2H, CH2), 6.73 (d, 2H, J=8.8, 2Ar–H), 7.00 (d, 2H, J=8.8, 2Ar–H), 7.87–8.094 (mix of 6d, 12H, 12Ar–H). M+ for C37H45N7O: 604; found: 604.