期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 22, 期 40, 页码 14213-14218出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201602175
关键词
ferroelectrics; liquid crystals; porphyrin; self-assembly; supramolecular polymer
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan [25220805]
- JSPS
- Grants-in-Aid for Scientific Research [16H06508, 26390003, 16H06513] Funding Source: KAKEN
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.
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