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Fluorescent and photooptical properties of H-bonded LC composites based on stilbazole derivative

Paper ID Volume ID Publish Year Pages File Format Full-Text
27532 44029 2011 8 PDF Available
Title
Fluorescent and photooptical properties of H-bonded LC composites based on stilbazole derivative
Abstract

A novel series of H-bonded LC (smectic and nematic) composites and “model” mixtures without hydrogen bonding based on the stilbazole derivative were prepared. As the matrices of the composites following polymers were synthesized: smectic homopolymer containing p-oxybenzoic groups, nematic copolymer containing p-oxybenzoic and methoxyphenylbenzoic side groups, and nematic homopolymer with methoxyphenylbenzoate groups. The spectral properties of composite films were studied in detail. Significant differences in the fluorescence spectra of H-bonded LC composites and “model” mixtures were revealed. Mechanism of the processes occurring in the films of the LC composites under the action of the UV light was proposed. The mechanism includes a reversible proton transfer involved in the H-bonds formation. It was found that in the oriented films of the nematic composite degree of fluorescence polarization is higher than in the films of a similar mixture without H-bonding. The effect of linearly polarized light on the optical properties of the composite films was studied. It was shown that the highest values of the photoinduced dichroism are achieved in nematic liquid crystals composites. It was revealed that for the irradiated LC composites annealing leads to decease of dichroism values (degree of polarized emission drops to zero), whereas for “model” LC mixture without hydrogen bonding a significant increase in these parameters was found.

► Photooptical and fluorescent properties of a novel series of H-bonded LC (smectic and nematic) composites and “model” mixtures without hydrogen bonding based on the stilbazole derivative. ► The oriented films of the nematic composite show higher degree of fluorescence polarization than the films of a similar mixture without H-bonding. ► The effect of linearly polarized light on the optical properties of the composite films was demonstrated. ► Post irradiated (after annealing) growth of degree of fluorescence polarization in non-H-bonded systems was revealed.

Keywords
Liquid crystal composite; Hydrogen bonded composite; Stilbazole; Photo-orientation; Fluorescence
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Fluorescent and photooptical properties of H-bonded LC composites based on stilbazole derivative
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 221, Issue 1, 10 June 2011, Pages 22–29
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us