Visible‐Light‐Activated Molecular Switches

Bléger, David; Hecht, Stefan

doi:10.1002/anie.201500628

Cited by 695 publications

(657 citation statements)

References 95 publications

(232 reference statements)

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“…6−11 In photoactive materials light absorbed by chromophores can be converted into directed functionality, typically by means of photoinduced isomerization of nitrogen or carbon containing double bonds and pericylic reactions. 12−27 Indeed, E – Z isomerization results in large amplitude changes in structure as well as chemical and physical properties. 28−32 …”

Section: Introductionmentioning

confidence: 99%

Direct Observation of a Dark State in the Photocycle of a Light-Driven Molecular Motor

et al. 2016

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Controlling the excited-state properties of light driven molecular machines is crucial to achieving high efficiency and directed functionality. A key challenge in achieving control lies in unravelling the complex photodynamics and especially in identifying the role played by dark states. Here we use the structure sensitivity and high time resolution of UV-pump/IR-probe spectroscopy to build a detailed and comprehensive model of the structural evolution of light driven molecular rotors. The photodynamics of these chiral overcrowded alkene derivatives are determined by two close-lying excited electronic states. The potential energy landscape of these “bright” and “dark” states gives rise to a broad excited-state electronic absorption band over the entire mid-IR range that is probed for the first time and modeled by quantum mechanical calculations. The transient IR vibrational fingerprints observed in our studies allow for an unambiguous identification of the identity of the “dark” electronic excited state from which the photon’s energy is converted into motion, and thereby pave the way for tuning the quantum yield of future molecular rotors based on this structural motif.

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Section: Introductionmentioning

confidence: 99%

Direct Observation of a Dark State in the Photocycle of a Light-Driven Molecular Motor

et al. 2016

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“…[4] The light response of certain materials is associated to the presence of light active groups such as azobenzene that isomerizes under illumination.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of thermo and light responsive amphiphilic linear dendritic block copolymers

García‐Juan

Nogales

Blasco³

et al. 2016

European Polymer Journal

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-2 - ABSTRACTThe synthesis and structural characterization of a new dual responsive linear-dendritic block copolymer (LDBC) is presented. The LDBC is constituted by a thermoresponsive linear block from polymethacrylate of oligo-and diethylene glycol, and a light responsive dendron block of bis-MPA decorated at the periphery with 4-isobutyloxyazobenzene and alkyl chains in a 50:50 molar ratio. Blocks are coupled together by copper(I) catalyzed alkyne-azide cycloaddition (CuAAC). The ability of the LDBC to form vesicle self-assemblies in water is described, as well as the effect of light and temperature on the vesicles morphology, on the basis of transmission electron microscopy (TEM), dynamic light scattering (DLS) and UV-vis spectroscopy studies.The effect of UV light and temperature on the vesicles structure by SAXS and WAXS conducted on real time is also presented. Finally, the potential use of the vesicles to load and stimuli controlled release of small fluorescent molecules is probed.

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“…It has been shown that for specific linear azo polymers, this color can be removed, leading to permanent topographies [51]. Extensive research towards new applicable light triggered molecules [113] can lead to a more natural approach where the sun can be used as the light source [114]. The use of visible light triggering molecules (including azobenzenes) will continue to result in colored coatings.…”

Section: Discussionmentioning

confidence: 99%

Light-Triggered Formation of Surface Topographies in Azo Polymers

et al. 2017

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Properties such as friction, wettability and visual impact of polymer coatings are influenced by the surface topography. Therefore, control of the surface structure is of eminent importance to tuning its function. Photochromic azobenzene-containing polymers are an appealing class of coatings of which the surface topography is controllable by light. The topographies form without the use of a solvent, and can be designed to remain static or have dynamic properties, that is, be capable of reversibly switching between different states. The topographical changes can be induced by using linear azo polymers to produce surface-relief gratings. With the ability to address specific regions, interference patterns can imprint a variety of structures. These topographies can be used for nanopatterning, lithography or diffractive optics. For cross-linked polymer networks containing azobenzene moieties, the coatings can form topographies that disappear as soon as the light trigger is switched off. This allows the use of topography-forming coatings in a wide range of applications, ranging from optics to self-cleaning, robotics or haptics.

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Visible‐Light‐Activated Molecular Switches

Cited by 695 publications

References 95 publications

Direct Observation of a Dark State in the Photocycle of a Light-Driven Molecular Motor

Direct Observation of a Dark State in the Photocycle of a Light-Driven Molecular Motor

Self-assembly of thermo and light responsive amphiphilic linear dendritic block copolymers

Light-Triggered Formation of Surface Topographies in Azo Polymers

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