An Optically Active Polythiophene Exhibiting Electrochemically Driven Light‐Interference Modulation

Goto, Hiromasa

doi:10.1002/adfm.200801782

Cited by 21 publications

(9 citation statements)

References 42 publications

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“…In addition, XRD analysis of the film showed a broad diffraction at ∼4.3 Å (Supporting Information Figure S4), which was indicative of negligible interchain π−π stacking interactions. These features differ from those of the π‐conjugated polymer films that show metallic luster; consequently, it is unlikely that the green reflection of Polymer 1 originates from the structural color …”

Section: Resultsmentioning

confidence: 91%

“…Generally, silver lustrous paints are made by blending aluminum platelets with a polymer, while colored surfaces with a metallic luster are prepared by coating a glossy metal surface with a polymer film containing pigment particles . A representative method for preparing colored reflective films is the preparation of multi‐bilayered films consisting of a highly refractive polymer and less refractive polymer; when the layers have regular intervals, the film exhibits a specific color of reflection due to the interference of light, which is called the structural color. Since the films do not contain metal, they can transmit electromagnetic waves.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of green reflective films of polyaniline analogs containing azobenzene units

Yamada

Kukino

Wang

et al. 2014

J of Applied Polymer Sci

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Pd-catalyzed polycondensation of aniline derivatives and 4,4 0 -dibromoazobenzene affords polyaniline analogs containing azobenzene units. The polymers are red in solution and in thin films state, whereas they have a green luster in thick films. Substitution of 4,4 0 -dibromoazobenzene for 4,4 0 -dibromostilbene changes the reflection color from green to blue, whereas the introduction of a non-conjugated unit slightly affects the reflection color. The glossiness of the film is dependent on the smoothness of the film surface. The reflectance measurements using polarized light reveal that reflection spectra correlate well with the complex refractive index (ñ 5 n 1 ik) of the film. These results confirm that the green luster can be attributed to the uniform surface reflection of the object, which has a large refractive index and absorption coefficient at around 500 nm. The polymer films exhibit good transmission of radio frequency signals owing to the lack of free electron carriers.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of green reflective films of polyaniline analogs containing azobenzene units

Yamada

Kukino

Wang

et al. 2014

J of Applied Polymer Sci

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“…[5] Organizing environments, such as crystals and liquid crystals, function as reaction matrices possessing a certain order. [6] These polymerizations will be referred to as structure-organizing polymerizations (SOP) by matrix imprinting (MAT-I). SOP produces a 3D organized structure by a bottom-up technique.…”

Section: Introductionmentioning

confidence: 99%

Circular Dichroism of Bipolarons in a Chiroptically Active Conjugated Polymer

Goto

2016

Journal of Macromolecular Science, Part B

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Bipolarons (dications), as charge carriers in chiroptically active poly(3,4-ethylenedioxythiophene) (PEDOT*, * = chiral, atropisomer) prepared in cholesteric liquid crystals, were examined by circular dichroism (CD) spectroscopy. PEDOT* showed chiroptical activity in the near-IR (NIR) range indicating the existence of bipolarons with helical structure. The main-chain helicity and fingerprint texture derived from helical aggregation of the polymer at the macroscopic level are produced by the transcription from liquid crystals during the polymerization process. This is referred to as a matrix imprinting (MAT-I) process. The chiral-bipolaron (chiral-dications) state was confirmed through NIR-CD. The chiroptical activity of the bipolarons comes from the main-chain helical structure at the molecular level. A modulation of main-chain helicity due to generation of the polarons and bipolarons results in the electrochemically driven change in chiroptical activity (electro-chiroptical effect). We refer to chiroptically active charge carriers in the PEDOT* as chiralions.

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“…To prepare a compound which covers these requirement as chiral inducers, we Electrochemical polymerization has been carried out to prepare -conjugated polymers with electro-activity [18][19][20][21]. Electrochemical polymerization in CLC is possible by using indium-tin-oxide (ITO) coated sandwich polymerization method [22,23].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a pyrimidine-based new chiral inducer for construction of cholesteric liquid crystal electrolyte solution and its electrochemical polymerization, and stimulated emission like interference

Wang

Kawabata

Kawashima

et al. 2013

Polymer

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Pyrimidine-based chiral compounds were successfully synthesized via Mitsunobu reaction. The chiral molecules with rigid molecular shape can function as chiral inducers (chiral dopant) to prepare cholesteric liquid crystal (CLC) electrolyte solutions. We carried out electrochemical polymerization in the CLC electrolyte solution thus prepared with the chiral inducer. The polymerization in the CLC afforded chiroptically active polymer films. The synthesis of the pyrimidine-based chiral inducer, electrochemical polymerization, and observation of a surface image of the polymer were carried out. It is noted that the polymer shows laser diffraction in the visible range due to a periodic pattern produced by imprinting of structural chirality of the CLC electrolyte solution. The laser diffraction patterns are multiple circles, implying occurrence of stimulated emission via periodic patterns of the cholesteric order.

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An Optically Active Polythiophene Exhibiting Electrochemically Driven Light‐Interference Modulation

Cited by 21 publications

References 42 publications

Preparation and characterization of green reflective films of polyaniline analogs containing azobenzene units

Preparation and characterization of green reflective films of polyaniline analogs containing azobenzene units

Circular Dichroism of Bipolarons in a Chiroptically Active Conjugated Polymer

Synthesis of a pyrimidine-based new chiral inducer for construction of cholesteric liquid crystal electrolyte solution and its electrochemical polymerization, and stimulated emission like interference

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