Application of Delta- and Lambda-Isomerism of Octahedral Metal Complexes for Inducing Chiral Nematic Phases

作者：Sato Hisako^*; Yamagishi Akihiko

来源：International Journal of Molecular Sciences, 2009, 10(10): 4559-4574.

DOI：10.3390/ijms10104559

• metal complex
• chiral
• dopant
• nematic
• twisting power
• vibrational circular dichroism

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.

• 出版日期2009-10