Sims, Mark Timothy orcid.org/0000-0001-9438-5527, Abbott, Laurence Colin, Cowling, Stephen James orcid.org/0000-0002-4771-9886 et al. (2 more authors) (2016) Molecular Design Parameters of Anthraquinone Dyes for Guest-Host Liquid-Crystal Applications:Experimental and Computational Studies of Spectroscopy, Structure and Stability. Journal of Physical Chemistry C. 11151–11162. ISSN 1932-7455
Abstract
A set of five anthraquinone dyes with bis(4-propylphenyl) substituent groups, connected via sulfide or amine linkages at the 1,5-positions or directly at the 2,6-positions, have been studied in solution by UV-vis spectroscopy and electrochemistry, allied with density functional theory calculations of structures, electronic transitions, and redox potentials. The visible transitions and redox potentials are shown to vary with the HOMO and LUMO energies, with the variation in both color and redox stability between the dyes being attributable principally to variations in the HOMOs located mainly on the substituents and outer anthraquinone rings. The calculated molecular structures and visible transition dipole moments are shown to vary subtly with substituent, giving variations in the molecular aspect ratios, minimum moment of inertia axes, and transition dipole moment vector orientations that can rationalize the alignment trends reported in the literature for such anthraquinone dyes in liquid crystal hosts, showing why 1,5-disulfide and 2,6-diphenyl substituents give better designs than 1,5-diamine substituents. The computational approaches reported here are shown to give good matches with experimental trends, indicating that they may be used more generally to aid the rational molecular design of dyes for applications as guests in liquid crystal hosts.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 American Chemical Society |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Chemistry (York) |
Funding Information: | Funder Grant number EPSRC EP/M020584/1 |
Depositing User: | Pure (York) |
Date Deposited: | 13 Jun 2016 09:45 |
Last Modified: | 16 Dec 2024 00:06 |
Published Version: | https://doi.org/10.1021/acs.jpcc.6b03607 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1021/acs.jpcc.6b03607 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:100377 |
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