期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 55, 页码 14639-14643出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201803863
关键词
anisotropy; cage compounds; dielectric permittivity; ferroelectricity; polar order
资金
- SERB, India [EMR/2016/000614]
- Nanomission Project, DST, India [SR/NM/TP-13/2016]
Designing molecular crystals with switchable dipoles for ferroelectric applications is challenging and often serendipitous. Herein, we show a systematic approach toward hierarchical 1D, 2D and 3D frameworks that are assembled through successive linkage of metal-organic cages [Cu-6(H2O)(12)(TPTA)(8)](12+) with chloride ions. Their ferroelectric properties are due to the displacement of channel-bound nitrate counterions and solvated water molecules relative to the framework of cages. Ferroelectric measurements of crystals of discrete and 1D-framework assemblies showed axial ferroelectric anisotropy with high remnant polarisation. Both, the reversible formation of cage-connected networks and the observation of ferroelectric anisotropic behaviour are rare among metal-ligand cage assemblies.
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