Ferroelectric Coordination Polymers Self-Assembled from Mesogenic Zinc(II) Porphyrin and Dipolar Bridging Ligands
| Autor: | Nobuo Kimizuka, Hiroyuki Kishida, Masa Aki Morikawa, Keita Ishiba, Kenta Takemasu, Joseph K.-H. Hui |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Mesogen Organic Chemistry Supramolecular chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Ferroelectricity Porphyrin Catalysis 0104 chemical sciences Supramolecular polymers Condensed Matter::Materials Science Crystallography Dipole chemistry.chemical_compound chemistry Liquid crystal Self-assembly 0210 nano-technology |
| Zdroj: | Chemistry - A European Journal. 22:14213-14218 |
| ISSN: | 0947-6539 |
| DOI: | 10.1002/chem.201602175 |
| Popis: | A new class of ferroelectric coordination-based polymers has been developed by the self-assembly of lipophilic zinc porphyrin (ZnP) and ditopic bridging ligands. The ligands contain dipolar benzothiadiazole or fluorobenzene units, which are axially coordinated to ZnP with the dipole moments oriented perpendicular to the coordination axes. The coordination-based polymers show ferroelectric characteristics in the liquid crystalline state, as revealed by distinctive hysteresis in the polarization-electric field (P-E) loops and inversion current peaks in current-voltage (I-V) loops. The observed ferroelectric properties are explainable by flip-flop rotation of the dipolar axle ligands induced by the applied electric field, as demonstrated by the positive-up-negative-down (PUND) measurements. The present system provides a new operating principle in supramolecular ferroelectrics. |
| Databáze: | OpenAIRE |
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