Mukherjee, Anurag ; Barman, Shubhankar ; Ghosh, Anupam ; Datta, Ayan ; Datta, Anuja ; Ghosh, Suhrit (2022) A Hierarchical (Macro)molecular Assembly Assisted by Donor–Acceptor Charge‐Transfer Interactions Exhibiting Room‐Temperature Ferroelectricity Angewandte Chemie International Edition, 61 (25). ISSN 1433-7851
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Official URL: http://doi.org/10.1002/anie.202203817
Related URL: http://dx.doi.org/10.1002/anie.202203817
Abstract
This communication reveals co-assembly of an electron-deficient naphthalene-diimide (NDI)-appended polyurethane (P1) and electron-rich pyrene (Py), forming an organogel with prominent room-temperature ferroelectricity. In a non-polar medium, intra-chain hydrogen-bonding among the urethane groups of P1 produces a folded structure with an array of the NDIs in the periphery, which intercalate Py by charge-transfer (CT)-interaction. Such CT-complexation enables slow crystallization of the peripheral hydrocarbons, causing gelation with nanotubular morphology, in which the wall consists of the alternating NDI−Py stack. Such D-A assembly exhibits ferroelectricity (saturation polarization Ps≈0.8 μC cm−2 and coercive field Ec≈8 kV cm−1 at 500 V and 10 Hz frequency) with Curie temperature (Tc) of ≈350 K, which can be related to the disassembly of the CT-complex. In the absence of Py, P1 forms spherical aggregates, showing dielectric behaviour.
Item Type: | Article |
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Source: | Copyright of this article belongs to John Wiley & Sons, Inc |
ID Code: | 125979 |
Deposited On: | 17 Oct 2022 11:22 |
Last Modified: | 17 Oct 2022 11:22 |
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