期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 3, 页码 914-918出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201408491
关键词
dielectric materials; host-guest systems; inclusion compounds; molecular dynamics; phase transitions
资金
- NSFC [21290173, 21301198, 91422300]
- 973 Project [2012CB821706]
- NSF of Guangdong [S2012030006240]
- 100 Talents Program of SYSU
- Young Scientists Training Program of Jiangxi Province [20122BCB23020]
A new perovskite-like coordination polymer [(CH3)(2)NH2][Cd(N-3)(3)] is reported which undergoes a reversible ferroelastic phase transition. This transition is due to varied modes of motion of the [(CH3)(2)NH2](+) guest accompanied by a synergistic deformation of the [Cd(N-3)(3)](-) framework. The unusual two-staged switchable dielectric relaxation reveals the molecular dynamics of the polar cation guest, which are well controlled by the variable confined space of the host framework. As the material switches from the ferroelastic phase to the paraelastic phase, a remarkable increase of the rotational energy barrier is detected. As a result, upon heating at low temperature, this compound shows a notable change from a low to a high dielectric state in the ferroelastic phase. This thermoresponsive host-guest system may serve as a model compound for the development of sensitive thermoresponsive dielectric materials and may be key to understanding and modulating molecular/ionic dynamics of guest molecules in confined space.
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