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Photochemical behavior in azobenzene having acidic groups. Preparation of magnetic photoresponsive gels

Paper ID Volume ID Publish Year Pages File Format Full-Text
27567 44030 2011 7 PDF Available
Title
Photochemical behavior in azobenzene having acidic groups. Preparation of magnetic photoresponsive gels
Abstract

The photochemistry of three azobenzenes representing contrasting photochemical behaviors is described in the present work. Thus, Methyl Orange (MO, 4-[[(4-dimethylamino)phenyl]-azo]benzenesulfonic acid sodium salt, hereinafter (1) and 4-hydroxyazobenzene-4′-sulfonic acid (2) undergo in water fast photochemical proton shift, with decays in the microsecond timescale. In contrast to the previous cases, azobenzene-4,4′-dicarboxylic acid (3) undergoes photoisomerization in water. This photochemical behavior allows the preparation of aqueous gels with Aerosil as gelating agent (5% weight) exhibiting high cyclability and photoreversible isomerization of the trans to cis (300 nm irradiation) and cis to trans (visible white light irradiation). Gels containing azobenzene 3 as photoresponsive molecule and well-dispersed magnetite (Fe3O4) nanoparticles exhibit simultaneously high photoresponse and magnetic properties. Photoisomerization of compound 3 in these gels leads to small but reliable changes (25 G coercive field) in the magnetic hysteresis loop of magnetite nanoparticles. This novel concept of optical modulation of magnetism in iron oxide nanoparticles paves the way for the study of new systems, with a stronger coupling between trans–cis photoisomerization and magnetic properties.

Keywords
Photoisomerization; Azobenzene; Laser flash photolysis; Photoresponsive gel; Magnetite nanoparticles; Multifunctional materials
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Photochemical behavior in azobenzene having acidic groups. Preparation of magnetic photoresponsive gels
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 217, Issue 1, 1 January 2011, Pages 157–163
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