Photomechanical bending of 4-aminoazobenzene crystals

Koshima, Hideko; Ojima, Naoko

doi:10.1016/j.dyepig.2011.05.003

Cited by 99 publications

(65 citation statements)

References 15 publications

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“…[11][12][13][14][15][16][17][18] Macroscale molecular crystals rarely present ideal deformation properties and it is still a challenge to use molecular crystals in macroscale actuators. Nevertheless, molecular crystal actuators are fragile and are highly restricted in performance by the crystal size and shape.…”

Section: Tian Lan and Wei Chen*mentioning

confidence: 99%

Hybrid Nanoscale Organic Molecular Crystals Assembly as a Photon‐Controlled Actuator

Tian

Chen

2013

Angew Chem Int Ed

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Molecule deformation to macroactuation: In a novel hybrid assembly photoisomerization causes microscale deformation of molecules that is amplified to macroscale bending of a composite membrane. The nanoscale molecular crystals, which are unevenly distributed in a functional polymer matrix, provide a new strategy for designing higher performance actuators that combine the advantages of both molecular crystals and liquid crystal elastomers.

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Section: Tian Lan and Wei Chen*mentioning

confidence: 99%

Hybrid Nanoscale Organic Molecular Crystals Assembly as a Photon‐Controlled Actuator

Tian

Chen

2013

Angew Chem Int Ed

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“…Then the development of various types of molecular machines using the photomechanical effect of azobenzene chromophores has been intensively studied in the past decade. Koshima et al adopted light‐induced trans‐cis isomerization of 4‐(dimethylamino) azobenzene and 4‐aminoazobenzene molecular crystals as actuator, which can be reversibly driven by light . However, the configuration transition at molecular lever was very weak and difficult to be detected .…”

Section: Introductionmentioning

confidence: 99%

Precise Actuation of Bilayer Photomechanical Films Coated with Molecular Azobenzene Chromophores

Liu

Tang

et al. 2015

Macromol. Rapid Commun.

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Bilayer photomechanical films are fabricated by depositing one layer of molecular azobenzene chromophores onto flexible low-density polyethylene substrates. The photoinduced bending and unbending behavior of five azobenzene derivatives including azobenzene, 4-hydroxy-azobenzene, 4-((4-hydroxyphenyl)diazenyl)bezoitrile, 4-((4-methoxyph-enyl)diazenyl)phenol, and 4-(phenyldiazenyl)phenol is systematically studied by considering the incident light intensity and the thickness of the coated chromophore layers. Precise control of photoinduced curling of the bilayer film is successfully achieved upon irradiation with two beams of UV light, and the curled films can be recovered by thermal relaxation in the dark. The easily fabricated bilayer films show fast photomechanical response, strong photoinduced stress, and stability similar to crosslinked polymeric films.

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“…The E → Z photoisomerization of azobenzene derivatives is well documented for azobenzenecontaining polymers 18 , liquid crystals 9,18-24 , thin films [25][26][27] and crystals at the solid-liquid interface 28 , and a limited number of examples are reported in porous materials [29][30][31][32][33] (for example, metal-organic and covalent organic frameworks) and in molecular crystalline forms in which the azobenzene moiety is functionalized with polar substituents [34][35][36] . Our strategy is based on the use of molecules containing a central node that imparts a star-like threedimensional arrangement to azobenzene moieties for the fabrication of molecular crystals endowed with permanent porosity capable of promoting reversible E/Z isomerization in the solid state.…”

mentioning

confidence: 98%

Photoinduced reversible switching of porosity in molecular crystals based on star-shaped azobenzene tetramers

et al. 2015

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The development of solid materials that can be reversibly interconverted by light between forms with different physico-chemical properties is of great interest for separation, catalysis, optoelectronics, holography, mechanical actuation and solar energy conversion. Here, we describe a series of shape-persistent azobenzene tetramers that form porous molecular crystals in their E-configuration, the porosity of which can be tuned by changing the peripheral substituents on the molecule. Efficient E→Z photoisomerization of the azobenzene units takes place in the solid state and converts the crystals into a non-porous amorphous melt phase. Crystallinity and porosity are restored upon Z→E isomerization promoted by visible light irradiation or heating. We demonstrate that the photoisomerization enables reversible on/off switching of optical properties such as birefringence as well as the capture of CO2 from the gas phase. The linear design, structural versatility and synthetic accessibility make this new family of materials potentially interesting for technological applications.

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Photomechanical bending of 4-aminoazobenzene crystals

Cited by 99 publications

References 15 publications

Hybrid Nanoscale Organic Molecular Crystals Assembly as a Photon‐Controlled Actuator

Hybrid Nanoscale Organic Molecular Crystals Assembly as a Photon‐Controlled Actuator

Precise Actuation of Bilayer Photomechanical Films Coated with Molecular Azobenzene Chromophores

Photoinduced reversible switching of porosity in molecular crystals based on star-shaped azobenzene tetramers

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