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

被引：114

作者：

Shi, Chao ^{[1
]}

Zhang, Xi ^{[2
,3
]}

Cai, Ying ^{[1
]}

Yao, Ye-Feng ^{[2
,3
]}

Zhang, Wen ^{[1
]}

机构：

[1] Southeast Univ, Ordered Matter Sci Res Ctr, Nanjing 211189, Jiangsu, Peoples R China

[2] E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China

[3] E China Normal Univ, Shanghai Key Lab Magnet Resonance, Shanghai 200062, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 21期

关键词：

cyanide; phase transitions; pyridinium; single-crystal-to-single-crystal transformations; switchable dielectric constant; PHASE-TRANSITION; MOLECULAR ROTORS; SINGLE-CRYSTAL; DYNAMICS; FRAMEWORK; FERROELECTRICITY; SYMMETRY; POLYMER; MOTION;

D O I：

10.1002/anie.201501344

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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)(2)Co(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.

引用

页码：6206 / 6210

页数：5

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