The
influence of the annealing conditions on the thermally stimulated
photoinduced molecular reorientation of a photoinactive liquid crystalline
polymethacrylate with phenyl aldehyde and benzoic acid side groups
(P1) doped with 4-methoxyaniline, which forms photoalignable
4-methoxy-N-benzylideneaniline (MNBA) side groups in situ, was investigated. Light exposure and subsequent
thermal stimulation under a N2 atmosphere realized sufficient
cooperative molecular reorientation (D > 0.7),
but
the simultaneous thermal hydrolysis of the MNBA groups under humid
air lowered the molecular reorientation performance. By contrast,
subsequent thermal hydrolysis of MNBA after molecular reorientation
introduced different aromatic amines into the reoriented P1 film, which regulated the birefringence and photofunctionality of
the oriented film.
This paper reports the first magnetic circularly polarized luminescence (MCPL) characteristics of racemic helicenes, including four unsubstituted [n]helicenes (n = 3,4,5,7) and two [4]helicene derivatives bearing methoxy substituents, in tetrahydrofuran (THF) and dimethyl sulfoxide (DMSO) solutions. The value of j g MCPL j was calculated to be of the order of 10 À 3 T À 1 within 350-430 nm under the north-up (N-up) and south-up (Sup) Faraday geometries in an external magnetic field of 1.6 T. The [n]-dependent MCPL signs were altered by the N-up and Sup geometries.
Achiral pyrene and phenanthrene derivatives with electron-donating hydroxyl/methoxy and electron-withdrawing carboxylic acid groups exhibited magnetic circularly polarised luminescence at 360–410 nm in dilute solution under N-up and S-up Faraday geometries at 1.6 T.
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