Imaging of Accumulated Mechanical Stresses Using Self-Assembled Layered Conjugated Polymer

Mochizuki, Yuki; Imai, Hiroaki; Oaki, Yuya

doi:10.1021/acsami.3c12043

Cited by 5 publications

(1 citation statement)

References 69 publications

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“…π-Conjugated organic molecules have been applied to chemical sensors because of their excellent light absorption properties, luminescence, and tunability of chemical properties . By introducing functional groups which are capable of responding external stimuli such as specific chemical species, heat, vapor, or mechanical stress, , the resulting π-conjugated compounds can improve their sensitivity to detect external stimuli by changing their optical properties. In particular, luminescent materials showing color change have attracted attention owing to high visibility without using expensive instruments for measurement …”

Section: Introductionmentioning

confidence: 99%

Modulation of π-Conjugation of Polymer Main Chain Containing π-Extended Benzoxaborin by Molecular Addition

Morimoto,

Tanimura,

Gon

et al. 2024

Macromolecules

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We synthesize novel cyclic boronic acids incorporated into the main-chain π-conjugated system. The optical measurements under basic conditions reveal that the oligomer binds one-to-one to the sugar containing the cis-1,2-diol structure at the cyclic boronic acid moiety. In particular, the binding is accompanied by a bathochromic shift in absorption and emission spectra. The π-conjugated polymer maintained similar characteristics to the oligomer but showed emission in the longer wavelength region (λ PL = 493−525 nm) where the color change was clearly detectable before and after the coordination of diols. Theoretical calculations with density functional theory reveal that the diol bonding to the cyclic boronic acid moiety elevates the energy levels of frontier molecular orbitals, especially the highest occupied molecular orbital. This study demonstrates that the introduction of cyclic boronic acid into π-conjugated polymers is effective for detecting diols with emission color change under mild conditions as well as for manipulating the electronic structures of polymer main chains.

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Section: Introductionmentioning

confidence: 99%

Modulation of π-Conjugation of Polymer Main Chain Containing π-Extended Benzoxaborin by Molecular Addition

Morimoto,

Tanimura,

Gon

et al. 2024

Macromolecules

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High‐Sensitive Spatiotemporal Distribution Imaging of Compression Stresses Based on Time‐Evolutional Responsiveness

Ono,

Seishima,

Shigeta

et al. 2024

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Mechanoresponsive materials have been studied to visualize and measure stresses in various fields. However, the high‐sensitive and spatiotemporal imaging remain a challenging issue. In particular, the time evolutional responsiveness is not easily integrated in mechanoresponsive materials. In the present study, high‐sensitive spatiotemporal imaging of weak compression stresses is achieved by time‐evolutional controlled diffusion processes using conjugated polymer, capsule, and sponge. Stimuli‐responsive polydiacetylene (PDA) is coated inside a sponge. A mechanoresponsive capsule is set on the top face of the sponge. When compression stresses in the range of 6.67–533 kPa are applied to the device, the blue color of PDA is changed to red by the diffusion of the interior liquid containing a guest polymer flowed out of the disrupted capsule. The applied strength (F/N), time (t/s), and impulse (F·t/N s) are visualized and quantified by the red‐color intensity. When a guest metal ion is intercalated in the layered structure of PDA to tune the responsivity, the device visualizes the elapsed time (τ/min) after unloading the stresses. PDA, capsule, and sponge play the important roles to achieve the time evolutional responsiveness for the high‐sensitive spatiotemporal distribution imaging through the controlled diffusion processes.

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Co-assembly-Directed Enhancement of the Thermochromic Reversibility and Solvatochromic Selectivity of Supramolecular Polydiacetylene

Baek,

Heo,

Bae

et al. 2024

Langmuir

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The construction of functional materials via the co-assembly of multimolecular systems has recently emerged as a fascinating topic. The co-assembled multicomponent could promote the evolution of supramolecular assemblies into a high-order nanoarchitecture with improved functional properties. We report the successful preparation of a dual-functional polydiacetylene (MCPDA-Tz-CA) having thermochromic and solvatochromic properties via facile co-assembly of MCDA-Tz and cyanuric acid (MCDA-Tz-CA) followed by ultraviolet-induced polymerization. Molecular packing patterns from powder X-ray diffraction and density functional theory calculations of molecular self-assembly processes confirm highly ordered co-assembled lamellar structures. MCPDA-Tz-CA showed excellent reversible thermochromism properties when the temperature was increased from 30 to 150 °C with a reversible blue-to-red color transition that could be detected by the naked eye. Also, MCPDA-Tz-CA displayed selective blue-to-red solvatochromism against dimethylformamide and dimethyl sulfoxide. Detailed investigations revealed that the enhanced thermochromic reversibility and solvatochromic selectivity could be attributed to the hydrogen-bonding interactions and the formation of a network structure in the MCDA-Tz/cyanuric acid co-assembly. Our research opens a promising route for improving the performance of functional materials via noncovalent multicomponent arrangements at the molecular level.

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Imaging of Accumulated Mechanical Stresses Using Self-Assembled Layered Conjugated Polymer

Cited by 5 publications

References 69 publications

Modulation of π-Conjugation of Polymer Main Chain Containing π-Extended Benzoxaborin by Molecular Addition

Modulation of π-Conjugation of Polymer Main Chain Containing π-Extended Benzoxaborin by Molecular Addition

High‐Sensitive Spatiotemporal Distribution Imaging of Compression Stresses Based on Time‐Evolutional Responsiveness

Co-assembly-Directed Enhancement of the Thermochromic Reversibility and Solvatochromic Selectivity of Supramolecular Polydiacetylene

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