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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 (CC BY 3.0).
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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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