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- Title
A Chemically Triggered and Thermally Switched Dielectric Constant Transition in a Metal Cyanide Based Crystal.
- Authors
Shi, Chao; Zhang, Xi; Cai, Ying; Yao, Ye-Feng; Zhang, Wen
- Abstract
A dielectric constant transition is chemically triggered and thermally switched in (HPy)2[Na(H2O)Co(CN)6] ( 2, HPy=pyridinium cation) by single-crystal-to-single-crystal transformation and structural phase transition, respectively. Upon dehydration, (HPy)2[Na(H2O)2Co(CN)6] ( 1) transforms to its semi-hydrated form 2, accompanying a transition from a low-dielectric state to a high-dielectric state, and vice versa. This dielectric switch is also realized by a structural phase transition in 2 that occurs between room- and low-temperature phases, and which corresponds to high- and low-dielectric states, respectively. The switching property is due to the variation in the environment surrounding the HPy cation, that is, the hydrogen-bonding interactions and the crystal packing, which exert predominant influences on the dynamics of the cations that transit between the static and motional states.
- Subjects
PERMITTIVITY; METAL cyanides; SINGLE crystals; HYDROGEN bonding; CATIONS
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 21, p6304
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201501344