Photoinduced chirality in azobenzene-containing polymer systems

Choi, Suk–Won; Kawauchi, Susumu; Ha, Na Young; Takezoe, Hideo

doi:10.1039/b702835k

Cited by 83 publications

(58 citation statements)

References 55 publications

(132 reference statements)

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“…The values of φ Δ lin and φ Δ cir are evaluated by fitting the experimental data with Eqs. (10) and (11). The calculated curves fit very well with the experimental results and the values of linear and circular birefringences are calculated to be Δ = × − n 4 10 lin 2 and Δ = × − n 3 10 cir 3 , respectively.…”

Section: Resultsmentioning

confidence: 72%

“…In addition to the photoinduced linear anisotropy, chiral structures, whose handedness depends on the helicity of the light, were also optically induced in some azobenzene polymer films after irradiation with a circularly or elliptically polarized light. This phenomenon, known as chiroptical switching, becomes one of the principal and intriguing functionalities in azobenzene molecular systems [10][11][12][13][14][15]. The created chiral features can strongly affect the polarization state of the light propagating through the sample [16,17].…”

Section: Introductionmentioning

confidence: 98%

“…The experimental data are marked with symbols. The solid lines are the fitting curves following formula(11).…”

mentioning

confidence: 99%

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Polarization holographic gratings in an azobenzene copolymer with linear and circular photoinduced birefringence

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et al. 2015

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Section: Resultsmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Polarization holographic gratings in an azobenzene copolymer with linear and circular photoinduced birefringence

Zhao

Wang

Qin

et al. 2015

Optics Communications

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“…The azobenzene photoisomerization has been introduced into the bent-core LC system as the forms of monomers and polymers [168][169][170][171][172][173][174]. Since achiral bent-core molecules can form supermolecular chirality, incorporation of azobenzene units into bent-core molecules results in interesting chirality transformation.…”

Section: Light-driven Structural Transformationmentioning

confidence: 99%

Electric‐ and Light‐Responsive Bent‐Core Liquid Crystals: From Molecular Architecture and Supramolecular Nanostructures to Applications

Zhang¹

2013

Intelligent Stimuli‐Responsive Materials

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The three classic states of matter are well known and ubiquitous in everyday life: solid, liquid, and gas. Liquid crystals (LCs), an intermediate state between solid crystal and isotropic liquid, constitute a new fascinating class of condensed soft matter uniquely combining both fluidity and long-range order. The fluid-like mobility enables LCs to be switchable under external stimuli, and crystal-like long-range order bestows anisotropic physical properties on LCs. LCs can be divided into two main classes: thermotropic and lyotropic. Thermotropic LCs consist of individual molecules (or ion pairs) and exhibit phase transitions with the change of temperature. In this case, temperature is the fundamental thermodynamic factor determining mesophase formation. Lyotropic LCs are a special type of solution system that can form mesophases as a function of both temperature and concentration of LC molecules. The building block of a lyotropic phase is an aggregate (called a micelle) formed via self-assembly of many molecules (typically on the order of 100). Examples of LCs can be found both in the natural world and in technological applications. Thermotropic LCs find 189 190 ELECTRIC-AND LIGHT-RESPONSIVE BENT-CORE LIQUID CRYSTALS a wide variety of uses in displays, and an important example of lyotropic LCs is cell membranes formed by amphiphilic lipids. Surfactants in water (i.e., soap water) constitute another useful example of lyotropic LCs. Although the majority of LCs are organic molecules, there exist many LC materials incorporating metals into organic anisotropic molecules [1-3]. These organic-inorganic hybrid LC materials are described as metallomesogens and are recently called metallotropic LCs [4] as distinguished from two main LC classes. In fact, metallomesogens can be classified as either thermotropic or lyotropic LCs depending on their composition and conditions. However, it should be noted that metallomesogens offer a material platform to incorporate magnetic, electronic, optical, redox, and catalytic properties common to inorganic materials into LCs.Although thermotropic LCs have been known to scientists for over 100 years since a discovery by the Austrian botanical physiologist Friedrich Reintizer in 1888, it was only in the late 1960s that they began to be used in display applications. Today, they are best known for their exceptionally successful commercial applications in flat panel display products such as TVs, smart phones, computer displays, and digital projectors. Although today's LC display technology is becoming very advanced, LC materials used in display devices possess the simplest nematic (N) phase and their molecules have been variants on simple rod shapes (Fig. 6.1a). Besides nematic phases, LCs can exhibit other phases: smectic (Sm), columnar (Col), and cubic phases, depending on the orientational or positional orders of their molecules. Nematic phases have only long-range orientational order, smectic mesophases exhibit one-dimensional (1D) positional order and form two-dimensional (2D) layered ...

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“…38,39 In these studies, rapid and reversible photoand thermo-isomerization reactions of azobenzene moieties provided a versatile photo-switchable system and further induced conformational transitions of the polymer backbone. Related studies have been summarized in a review by Choi et al 40 in 2007.…”

Section: Transformation Of Chiral Signals G Qing and T Sunmentioning

confidence: 99%

The transformation of chiral signals into macroscopic properties of materials using chirality-responsive polymers

Qing

Sun

2012

NPG Asia Mater

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The ability to transform the chiral signals of molecules into the macroscopic properties of a material will offer significant advantages in the development of chiral functional devices and chirality-related applications. Chirality-responsive polymers provide an excellent platform to realize this objective, which often involves two basic strategies. The first strategy is to utilize various external stimuli to directly mediate the chiral conformations of a polymer, through which the energy input is transformed into a macroscopic change in the properties of a material. The second strategy is to utilize the enantioselective interaction between polymers and guest chiral molecules to trigger a stepwise conformational change in smart polymers, which then results in transformation of the macroscopic properties. This review summarizes recent progress in generating chirality-responsive polymers based on these strategies and discusses advances in their applications as chiral sensors, liquid crystals, optical and electrical devices, nanomachines and so on. We then introduce the emerging field of chiral bio-interface materials, in which chiral signals are transformed into changes in the macroscopic behavior of cells and biomacromolecules based on the stereospecific interactions between biological systems and artificial materials.

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Photoinduced chirality in azobenzene-containing polymer systems

Cited by 83 publications

References 55 publications

Polarization holographic gratings in an azobenzene copolymer with linear and circular photoinduced birefringence

Polarization holographic gratings in an azobenzene copolymer with linear and circular photoinduced birefringence

Electric‐ and Light‐Responsive Bent‐Core Liquid Crystals: From Molecular Architecture and Supramolecular Nanostructures to Applications

The transformation of chiral signals into macroscopic properties of materials using chirality-responsive polymers

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