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Orientation and solvatochromism of dyes in liquid crystals

Palsson, L-O.; Szablewski, M.; Roberts, A.; Masutani, A.; Love, G.D.; Cross, G.H.; Bloor, D.; Kay, A.J.; Woolhouse, A.D.; Yasuda, A.

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Authors

L-O. Palsson

A. Roberts

A. Masutani

G.D. Love

G.H. Cross

D. Bloor

A.J. Kay

A.D. Woolhouse

A. Yasuda



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.

Journal Article Type Article
Publication Date Jan 1, 2003
Deposit Date Dec 19, 2006
Publicly Available Date Nov 18, 2014
Journal Molecular Crystals and Liquid Crystals
Print ISSN 1542-1406
Electronic ISSN 1563-5287
Publisher Taylor and Francis Group
Peer Reviewed Peer Reviewed
Volume 402
Issue 1
Pages 43-53
DOI https://doi.org/10.1080/744816685
Keywords Anisotropy, Guest-host interactions, Orientation, Order parameter, Solubility.
Public URL https://durham-repository.worktribe.com/output/1581890

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