Application of Δ- and λ-isomerism of octahedral metal complexes for inducing chiral nematic phases.
The Delta- and Lambda-isomerism of octahedral metal complexes is employed as a source of chirality for inducing chiral nematic phases. By applying a wide range of chiral metal complexes as a dopant, it has been found that tris(beta-diketonato)metal(III) complexes exhibit an extremely high value of helical twisting power. The mechanism of induction of the chiral nematic phase is postulated on the basis of a surface chirality model. The strategy for designing an efficient dopant is described, together with the results using a number of examples of Co(III), Cr(III) and Ru(III) complexes with C(2) symmetry. The development of photo-responsive dopants to achieve the photo-induced structural change of liquid crystal by use of photo-isomerization of chiral metal complexes is also described.
Sato
Hisako
H
Department of Chemistry, Faculty of Science, Ehime University/Matsuyama, 790-8577, Japan.|PRESTO/JST/Chiba, 277-8561, Japan.
Yamagishi
Akihiko
A
Department of Chemistry, Faculty of Science, Ehime University, Ochanomizu University/Tokyo, 112-8610, Japan.
D002857:Chromium / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D006885:Hydroxybutyrates / Q000737:chemistry; D050866:Liquid Crystals / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D010422:Pentanones / Q000737:chemistry; D012428:Ruthenium / Q000737:chemistry; D013237:Stereoisomerism
D056831:Coordination Complexes; D006885:Hydroxybutyrates; D008670:Metals; D010422:Pentanones; D002857:Chromium; C049529:acetyl acetonate; D003035:Cobalt; D012428:Ruthenium