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- Title
A 36-Fold Multiple Unit Cell and Switchable Anisotropic Dielectric Responses in an Ammonium Magnesium Formate Framework.
- Authors
Shang, Ran; Wang, Zhe-Ming; Gao, Song
- Abstract
An ammonium Mg formate framework, prepared by using di-protonated 1,3-propanediamine (pnH22+), has a rare three-dimensional binodal (412⋅63)(49⋅66)3 Mg-formate framework with elongated cavities accommodating pnH22+⋅⋅⋅H2O⋅⋅⋅pnH22+ assemblies. It displays a para-electric to antiferroelectric phase transition at 275 K, with a 36-fold multiple unit cell from the high-temperature cell of 1703 Å3 to the low-temperature one of 60 980 Å3. The change results from the disorder-order transition of the pnH22+ cations and H2O molecules. The motions of these components freeze in a stepwise fashion on going from the high-temperature disorder state to the low-temperature ordered state, triggering the switch from high to low dielectric constants, and the spatial limitation of such motions contributes the strong dielectric anisotropy.
- Subjects
AMMONIUM; PROPANEDIAMINE; ANTIFERROELECTRICITY; UNIT cell; CATIONS; ANISOTROPY
- Publication
Angewandte Chemie International Edition, 2015, Vol 54, Issue 8, p2534
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201411005