Photoinitiated chemico-mechanical damage of triacetylcellulose

Mikheyev, Yu.A.; Guseva, L. N.; Rogova, L.S.; Toptygin, D.Ya.

doi:10.1016/0144-2880(82)90006-9

Cited by 7 publications

(2 citation statements)

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“…[13,14] Furthermore,t here are few studies on the effect of external forces on polymers,w hich demonstrate an increase in the photodegradation efficiencywith mechanical load. [15,16] Conical intersections (CIs) between the potential energy surfaces (PESs) of different electronic states provide the photochemical funnels that mediate nonradiative decay. [17] Moreover,t he CI topography is known to determine fundamental aspects of photoreactivity.…”

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confidence: 99%

Optomechanical Control of Quantum Yield in Trans–Cis Ultrafast Photoisomerization of a Retinal Chromophore Model

et al. 2017

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The quantum yield of a photochemical reaction is one of the most fundamental quantities in photochemistry, as it measures the efficiency of the transduction of light energy into chemical energy. Nature has evolved photoreceptors in which the reactivity of a chromophore is enhanced by its molecular environment to achieve high quantum yields. The retinal chromophore sterically constrained inside rhodopsin proteins represents an outstanding example of such a control. In a more general framework, mechanical forces acting on a molecular system can strongly modify its reactivity. Herein, we show that the exertion of tensile forces on a simplified retinal chromophore model provokes a substantial and regular increase in the trans-to-cis photoisomerization quantum yield in a counterintuitive way, as these extension forces facilitate the formation of the more compressed cis photoisomer. A rationale for the mechanochemical effect on this photoisomerization mechanism is also proposed.

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confidence: 99%

Optomechanical Control of Quantum Yield in Trans–Cis Ultrafast Photoisomerization of a Retinal Chromophore Model

et al. 2017

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“…In this regard, some studies on the optomechanical behavior of azobenzene have been published, while computational methods have been developed for determining the mechanically induced variation of the excitation energy of a chromophore . Furthermore, there are few studies on the effect of external forces on polymers, which demonstrate an increase in the photodegradation efficiency with mechanical load …”

Section: Methodsmentioning

confidence: 99%

Optomechanical Control of Quantum Yield in Trans–Cis Ultrafast Photoisomerization of a Retinal Chromophore Model

et al. 2017

View full text Add to dashboard Cite

The quantum yield of a photochemical reaction is one of the most fundamental quantities in photochemistry, as it measures the efficiency of the transduction of light energy into chemical energy. Nature has evolved photoreceptors in which the reactivity of a chromophore is enhanced by its molecular environment to achieve high quantum yields. The retinal chromophore sterically constrained inside rhodopsin proteins represents an outstanding example of such a control. In a more general framework, mechanical forces acting on a molecular system can strongly modify its reactivity. Herein, we show that the exertion of tensile forces on a simplified retinal chromophore model provokes a substantial and regular increase in the trans‐to‐cis photoisomerization quantum yield in a counterintuitive way, as these extension forces facilitate the formation of the more compressed cis photoisomer. A rationale for the mechanochemical effect on this photoisomerization mechanism is also proposed.

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Influence of oxygen and sterically hindered phenols on the chemical-mechanical fracture of cellulose triacetate

Rogova

Guseva

Mikheyev

et al. 1985

Polymer Science U.S.S.R.

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Photoinitiated chemico-mechanical damage of triacetylcellulose

Cited by 7 publications

References 1 publication

Optomechanical Control of Quantum Yield in Trans–Cis Ultrafast Photoisomerization of a Retinal Chromophore Model

Optomechanical Control of Quantum Yield in Trans–Cis Ultrafast Photoisomerization of a Retinal Chromophore Model

Optomechanical Control of Quantum Yield in Trans–Cis Ultrafast Photoisomerization of a Retinal Chromophore Model

Influence of oxygen and sterically hindered phenols on the chemical-mechanical fracture of cellulose triacetate

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