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A Chemically Triggered and Thermally Switched Dielectric Constant Transition in a Metal Cyanide Based Crystal
Author(s) -
Shi Chao,
Zhang Xi,
Cai Ying,
Yao YeFeng,
Zhang Wen
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201501344
Subject(s) - cyanide , dielectric , materials science , constant (computer programming) , crystal (programming language) , transition metal , metal , optoelectronics , chemistry , organic chemistry , metallurgy , computer science , programming language , catalysis
A dielectric constant transition is chemically triggered and thermally switched in (HPy) 2 [Na(H 2 O)Co(CN) 6 ] ( 2 , HPy=pyridinium cation) by single‐crystal‐to‐single‐crystal transformation and structural phase transition, respectively. Upon dehydration, (HPy) 2 [Na(H 2 O) 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.