Volume 127, Issue 21 pp. 6304-6308
Zuschrift

A Chemically Triggered and Thermally Switched Dielectric Constant Transition in a Metal Cyanide Based Crystal

Chao Shi

Chao Shi

Ordered Matter Science Research Center, Southeast University, Nanjing 211189, Jiangsu (China)

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Xi Zhang

Xi Zhang

Department of Physics & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 200062 (China)

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Ying Cai

Ying Cai

Ordered Matter Science Research Center, Southeast University, Nanjing 211189, Jiangsu (China)

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Prof. Ye-Feng Yao

Corresponding Author

Prof. Ye-Feng Yao

Department of Physics & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 200062 (China)

Ye-Feng Yao, Department of Physics & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 200062 (China)

Wen Zhang, Ordered Matter Science Research Center, Southeast University, Nanjing 211189, Jiangsu (China)

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Prof. Wen Zhang

Corresponding Author

Prof. Wen Zhang

Ordered Matter Science Research Center, Southeast University, Nanjing 211189, Jiangsu (China)

Ye-Feng Yao, Department of Physics & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, North Zhongshan Road 3663, Shanghai 200062 (China)

Wen Zhang, Ordered Matter Science Research Center, Southeast University, Nanjing 211189, Jiangsu (China)

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First published: 01 April 2015
Citations: 23

This work was financially supported by the NSFC (Grant No. 21225102 and 21174039). We thank beamline BL14B (Shanghai Synchrotron Radiation Facility) for providing the beam time.

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.

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