A Chemically Triggered and Thermally Switched Dielectric Constant Transition in a Metal Cyanide Based Crystal |
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| Authors: | Chao Shi Xi Zhang Ying Cai Prof Ye‐Feng Yao Prof Wen Zhang |
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| Affiliation: | 1. Ordered Matter Science Research Center, Southeast University, Nanjing 211189, Jiangsu (China);2. Department of Physics & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 200062 (China) |
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| Abstract: | A dielectric constant transition is chemically triggered and thermally switched in (HPy)2Na(H2O)Co(CN)6] ( 2 , HPy=pyridinium cation) by single‐crystal‐to‐single‐crystal transformation and structural phase transition, respectively. Upon dehydration, (HPy)2Na(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. |
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| Keywords: | cyanide phase transitions pyridinium single‐crystal‐to‐single‐crystal transformations switchable dielectric constant |
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