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Orientation and solvatochromism of dyes in liquid crystals.

Pålsson, L. O. and Szablewski, Marek and Roberts, A. and Masutani, A. and Love, G. D. and Cross, G. H. and Bloor, D. and Kay, A. J. and Woolhouse, A. D. and Masutani, A. and Yasuda, A. (2003) 'Orientation and solvatochromism of dyes in liquid crystals.', Molecular crystals and liquid crystals., 402 (1). pp. 43-53.

Abstract

The orientation and solvatochromism of some dye molecules in a liquid crystal have been investigated. Interactions with the host and the structure of the dye molecule affect the macroscopic alignment of dichroic dye molecules in a liquid crystal: It was observed that some dye molecules show a large bathochromic shift of their absorption maxima in the liquid crystal host relative to the situation in isotropic solvents. It is suggested that this is due to the occurrence of a much weaker reaction field in the anisotropic, rigid host. These dye molecules show little or no apparent order in the anisotropic host despite the observation of a reduction in the electro optic switching time when the dye is present. The highest degree of macroscopic alignment was observed for a merocyanine compound, which showed the smallest solvatochromic shift in the liquid crystal host. These results are discussed in terms of the steric, dipolar and hydrogen bond interactions between the guest and the host.

Item Type:Article
Keywords:Anisotropy, Guest-host interactions, Orientation, Order parameter, Solubility.
Full text:PDF - Accepted Version (120Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1080/744816685
Publisher statement:This is an Accepted Manuscript of an article published by Taylor & Francis Group in Molecular Crystals and Liquid Crystals on 01/01/2003, available online at: http://www.tandfonline.com/10.1080/744816685.
Record Created:19 Dec 2006
Last Modified:18 Nov 2014 14:15

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