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Photo-optical properties of amorphous and crystalline films of azobenzene-containing photochromes with bent-shaped molecular structure

Paper ID Volume ID Publish Year Pages File Format Full-Text
26292 43944 2016 13 PDF Available
Title
Photo-optical properties of amorphous and crystalline films of azobenzene-containing photochromes with bent-shaped molecular structure
Abstract

•Photooptical phenomena in films of novel photochromic bent-shaped compounds.•Polarized visible and UV light induces the photoorientation of the chromophores.•High values of photoinduced dichroism which are comparable with other azo-systems.•Photoinduced melting could be served for the optical data recording and storage.

A comparative study of the photo-optical properties and the photo-orientation processes in thin films of the bent-shaped azobenzene-containing compounds with different molecular structure was performed. For this purpose three new compounds were designed and prepared: two of these compounds with a symmetric bent-shaped molecular structure incorporate two azobenzene chromophores with different length of alkyl chains (6 and 8 methylene units), the third bent-shaped compound possesses only one azobenzene fragment. The effect of molecular and supramolecular structure, thermal prehistory of the films, wavelengths of the excitation light on the photo-optical properties, photoorientation processes and films morphology was revealed. It was shown that UV-irradiation leads to E–Z isomerization of azobenzene fragments in both amorphousized and crystalline films of the synthesized substances. This process is partially suppressed in crystalline films, but, nevertheless, UV-irradiation of the bichromophoric compounds results in transition from crystalline to amorphous state and decrease in the surface roughness. Irradiation of amorphousized films with polarized visible and UV-light induces the photoorientation of chromophores in direction perpendicular to the polarization plane of the incident light. Relatively high values of photoinduced dichroism in the bent-shaped compounds (D ∼ 0.60–0.65) are comparable with other azobenzene-containing rod-shaped systems. Photoinduced isothermal melting and photoorientation processes could be served for the photo-optical data recording and storage.

Keywords
Bent-shaped azobenzene-containing compounds; E–Z isomerization; Thin films; Photoinduced phase transition; Photoorientation
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Photo-optical properties of amorphous and crystalline films of azobenzene-containing photochromes with bent-shaped molecular structure
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 316, 1 February 2016, Pages 75–87
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