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Search for "light-controlled materials" in Full Text gives 1 result(s) in Beilstein Journal of Organic Chemistry.

Recent advances towards azobenzene-based light-driven real-time information-transmitting materials

Jaume García-Amorós and
Dolores Velasco

Beilstein J. Org. Chem. 2012, 8, 1003–1017, doi:10.3762/bjoc.8.113

-chromophore and the thermal cis-to-trans isomerisation, the kinetics and mechanism are also discussed as a key point for reaching azoderivatives endowed with fast thermal back-isomerisation kinetics. Keywords: kinetics; light-controlled materials; molecular switches; photochromic switches; push–pull

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Graphical Abstract

Figure 1: Some important families of photochromic compounds and their photochromic reactions.

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Figure 2: Photochromism of azobenzene derivatives and energetic profile for the switching process.

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Figure 3: General overview of the different types of azoderivatives presented in this review.

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Figure 4: Changes in the electronic spectrum of a 3 cis-to-trans isomerising ethanol solution at 45 °C (Δt = ...

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Figure 5: Chemical structure and thermal relaxation time in ethanol at 298 K, τ, for the slow thermally-isome...

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Figure 6: Rotation and inversion mechanisms proposed for the thermal cis-to-trans isomerisation processes of ...

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Figure 7: Effect of the presence of the electron-withdrawing cyano and nitro groups on the thermal relaxation...

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Figure 8: Transient absorption generated by UV irradiation (λ = 355 nm) for azo-dyes 8 (right) and 9 (left) i...

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Figure 9: Effect of the presence of a positively charged nitrogen as an electron-withdrawing group on the the...

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Figure 10: Mechanism proposed for the thermal cis-to-trans isomerisation process for the push–pull azopyridini...

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Figure 11: Comparison between the thermal relaxation time at 298 K, τ, for the azoderivative 4 (type-I) and th...

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Figure 12: Solvent effect on the thermal relaxation time at 298 K, τ, for the type-II azophenols 11–13.

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Figure 13: Transient generated by irradiation with UV-light (λ = 355 nm) for the type-II azophenol 12 in ethan...

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Figure 14: Proposed isomerisation mechanisms for the thermal cis-to-trans isomerisation of the alkoxy-substitu...

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Figure 15: Solvent effect on the thermal relaxation time at 298 K, τ, for the type-II ortho-substituted azophe...

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Figure 16: Cooperative effect of the para- and ortho-hydroxyl groups in azophenol 17.

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Figure 17: Effect of the poly-hydroxylation of the azobenzene core on the thermal relaxation time at 298 K, τ,...

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Figure 18: Transients generated by irradiation with UV-light (λ = 355 nm) for the poly-substituted azophenol 18...

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Figure 19: Effect of the introduction of electron-withdrawing groups in the position 4’ of the azophenol struc...

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Figure 20: Transient absorptions generated by UV irradiation (λ = 355 nm) of azo-dyes 11 (type-II), 19 (type-I...

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Figure 21: Effect of the introduction of the hydroxyl group in the position 2’ of the push–pull azo-dye on the...

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Figure 22: Effect of the substitution of a benzene ring by a pyridine one on the thermal relaxation time in et...

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Figure 23: Influence of the introduction of additional electron-withdrawing nitro groups in the pyridine ring ...

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Figure 24: Chemical structure and thermal relaxation time in ethanol at 298 K, τ, for the type-III azoderivati...

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Figure 25: Oscillation of the optical density of an ethanol solution of azo-dye 26 generated by UV-light irrad...

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Published 04 Jul 2012

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