Photoinduced orientation of photoresponsive copolymers with N-benzylideneaniline and nonphotoreactive mesogenic side groups

Kawatsuki, Nobuhiro; Washio, Teppei; Kozuki, Junji; Kondo, Mizuho; Sasaki, Tomoyuki; Ono, Hiroshi

doi:10.1016/j.polymer.2014.11.007

Cited by 17 publications

(15 citation statements)

References 58 publications

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“…It is proposed that electronic coupling between lone pairs of nitrogen and π‐conjugation should inhibit electronic interaction through main chains [13] . In addition, N ‐benzylideneaniline (azomethine) and azobenzene, which are the monomeric units of PAM and PAZ, respectively, have photoreactivity [15,16] . Thus, PAM and PAZ have been hardly used as a scaffold for luminescent materials.…”

Section: Introductionmentioning

confidence: 99%

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Discovery of Functional Luminescence Properties Based on Flexible and Bendable Boron‐Fused Azomethine/Azobenzene Complexes with O,N,O‐Type Tridentate Ligands

Gon

Tanaka

Chujo

2021

The Chemical Record

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Azomethine (C=N) and azo (N=N) scaffolds are a part of structural units in poly(p‐phenylene azomethine) (PAM) and poly(p‐phenylene azo) (PAZ), respectively. Poly(p‐phenylene vinylene) (PPV) is known to be one of luminescent π‐conjugated polymers, meanwhile PAM and PAZ, which are the aza‐substituted PPV analogues, are regarded as weak or no emissive materials. However, by the boron complexation, intense emission can be induced. Furthermore, environment‐sensitivity and stimuli‐responsivity were also observed. In this review, we demonstrate unique and versatile luminescent properties based on “flexible and bendable” π‐conjugated systems composed of the boron‐fused azomethine and azobenzene complexes (BAm and BAz) with the O,N,O‐type tridentate ligands. The “flexible and bendable” luminophores showed intriguing optical behaviors, such as thermosalient effect, aggregation‐induced emission (AIE) and crystallized‐induced emission (CIE). Moreover, highly efficient emissions both in solution and film states were observed from the polymers. We illustrate the results and mechanisms on these luminescent properties from the series of our recent studies with BAm and BAz complexes and polymers.

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Section: Introductionmentioning

confidence: 99%

“…[13] In addition, Nbenzylideneaniline (azomethine) and azobenzene, which are the monomeric units of PAM and PAZ, respectively, have photoreactivity. [15,16] Thus, PAM and PAZ have been hardly used as a scaffold for luminescent materials. So far, the PAM scaffold is often utilized for constructing covalent organic frameworks (COFs).…”

Section: Introductionmentioning

confidence: 99%

Discovery of Functional Luminescence Properties Based on Flexible and Bendable Boron‐Fused Azomethine/Azobenzene Complexes with O,N,O‐Type Tridentate Ligands

Gon

Tanaka

Chujo

2021

The Chemical Record

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“…We have previously investigated the photoresponsiveness of N ‐benzylideneaniline (NBA) in LC polymers. [ 25–28 ] NBA changes from a trans‐ to a cis ‐configuration on UV exposure, and this photoisomerization behavior is similar to that of azobenzene, resulting in an isothermal change in the molecular order of the LCs; rod‐shaped trans ‐azobenzene stabilizes the liquid‐crystal state through structural miscibility, whereas the bent cis ‐azobenzene molecule acts as an impurity. [ 29,30 ]…”

Section: Introductionmentioning

confidence: 99%

Photoinduced Exfoliation of a Polymeric N‐Benzylideneaniline Liquid‐Crystalline Composite Based on a Photoisomerization‐Triggered Phase Transition

Kondo

Kojima

Ootsuki³

et al. 2021

Macro Chemistry & Physics

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Hydrogen‐bonded liquid crystalline polymer composites containing N‐benzylideneaniline (NBA) as a photoresponsive mesogenic unit are prepared. The mesomorphic properties of the composite decrease upon exposure to UV light because of trans‐to‐cis photoisomerization, which affects the adhesive properties and allows facile exfoliation. In addition, the destabilized phase spontaneously reverts to the initial state when UV light irradiation stops. After exfoliation, the composite can be rebonded to a glass substrate by heating above its melting point. This is the first observation of the phase transition of an NBA liquid crystalline polymer.

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“…In particular, the photoinduced orientational changes [8][9][10][11] enable one to develop all-optical devices including data storage [12], efficient optical switching [13] and light beam modulation [14]. The reorientation of LC molecules in optical field is enhanced by adding a small amount of absorbing dye molecules, which generally causes a photochemical reaction, to the LCs [15][16][17][18][19][20][21][22][23][24]. On the other hand, molecular reorientation without a photochemical reaction, termed photophysical process, has also been explored [25][26][27][28][29] because of exhibiting a well-defined threshold intensity of nonlinear molecular reorientation.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Molecular Reorientation of Polymer-Stabilized Dye-Doped Liquid Crystals by Depolarized Laser Beam

Matsumoto

Usui

Akamatsu

et al. 2020

J. Photopol. Sci. Technol.

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Liquid crystals (LCs) are the innovative materials that can control their molecular orientation using an optical field with a laser beam. However, the molecular orientation has been explored only by a polarized laser beam. In this study, we report the molecular reorientation of oligothiophene-doped LCs by an irradiation with a focused depolarized laser beam that has a spatial polarization pattern. Two self-diffraction rings occurred by nonlinear molecular reorientation induced by the irradiation with the focused depolarized laser beam. The threshold intensities measured by the focused depolarized laser beam were two times higher than that of the linearly polarized laser beam.

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Photoinduced orientation of photoresponsive copolymers with N-benzylideneaniline and nonphotoreactive mesogenic side groups

Cited by 17 publications

References 58 publications

Discovery of Functional Luminescence Properties Based on Flexible and Bendable Boron‐Fused Azomethine/Azobenzene Complexes with O,N,O‐Type Tridentate Ligands

Discovery of Functional Luminescence Properties Based on Flexible and Bendable Boron‐Fused Azomethine/Azobenzene Complexes with O,N,O‐Type Tridentate Ligands

Photoinduced Exfoliation of a Polymeric N‐Benzylideneaniline Liquid‐Crystalline Composite Based on a Photoisomerization‐Triggered Phase Transition

Nonlinear Molecular Reorientation of Polymer-Stabilized Dye-Doped Liquid Crystals by Depolarized Laser Beam

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