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Int. J. Mol. Sci. 2009, 10(10), 4559-4574; doi:10.3390/ijms10104559
Review

Application of Δ- and Λ-Isomerism of Octahedral Metal Complexes for Inducing Chiral Nematic Phases

1,2,*  and 3
1 Department of Chemistry, Faculty of Science, Ehime University/Matsuyama, 790-8577, Japan 2 PRESTO/JST/Chiba, 277-8561, Japan 3 Department of Chemistry, Faculty of Science, Ehime University, Ochanomizu University/Tokyo, 112-8610, Japan
* Author to whom correspondence should be addressed.
Received: 3 September 2009 / Revised: 29 September 2009 / Accepted: 22 October 2009 / Published: 23 October 2009
(This article belongs to the Special Issue Liquid Crystals)
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Abstract

The Δ- and Λ-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(β-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 C2 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.
Keywords: metal complex; chiral; dopant; nematic; twisting power; vibrational circular dichroism metal complex; chiral; dopant; nematic; twisting power; vibrational circular dichroism
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Sato, H.; Yamagishi, A. Application of Δ- and Λ-Isomerism of Octahedral Metal Complexes for Inducing Chiral Nematic Phases. Int. J. Mol. Sci. 2009, 10, 4559-4574.

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