3B08 Ability Assessment of Ruthenium (III) Complexes as Chiral Dopants for Liquid Crystals

Abstract

Chiral nematic phases are known to be induced in the presence of chiral dopants. In the present work, it has been found that a series of optical active tris-chelated ruthenium (III) complexes with 1, 3-diketonate ligands have large helical twisting power (HTP), or |β|=40〜500, when they are doped into N- (4-methoxybenzylidene) -4-butylaniline (MBBA) as a host. Measurements of the induced circular dichroism (ICD) showed that the helical sense of the MBBA was dependent on the ΔΛ chirality of a dopant.