Chiroptical properties of cholesteric liquid crystals induced by chiral photochromic 3,3 '-dialkoxyazobenzenes

Citation
C. Ruslim et al., Chiroptical properties of cholesteric liquid crystals induced by chiral photochromic 3,3 '-dialkoxyazobenzenes, MOLEC CRYST, 365, 2001, pp. 1011
Citations number
9
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Volume
365
Year of publication
2001
Database
ISI
SICI code
Abstract
The spectroscopic features and photoisomerization behaviors of chiral photo chromic 3,3'-dialkoxyazobenzenes were evaluated in an isotropic solution an d a nematic solvent. The effect of photoisomerization on the helical twisti ng power and handedness of these chiral dopants in induced cholesteric liqu id crystals were studied. Depending on the distance of the chiral center fr om the azo-core, elongation of the helical pitch and reversion of the hande dness upon E-to-Z photoisomerization were observed. These characteristics a re interesting for optical devices based on light-controlled phase switchin g.