Switchable Guest Molecular Dynamics in a Perovskite‐Like Coordination Polymer toward Sensitive Thermoresponsive Dielectric Materials1. (27th November 2014)

• Record Type: Journal Article
• Authors: Du, Zi‐Yi; Xu, Ting‐Ting; Huang, Bo; Su, Yu‐Jun; Xue, Wei; He, Chun‐Ting; Zhang, Wei‐Xiong; Chen, Xiao‐Ming
• Is Part Of: Angewandte Chemie. Volume 127:Number 3(2015)
• Page Start: 928
• Page End: 932
• Publication Date: 2014-11-27
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201408491
• Languages: English
• ISSNs: 0044-8249

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A new perovskite‐like coordination polymer [(CH₃)₂NH₂][Cd(N₃)₃] is reported which undergoes a reversible ferroelastic phase transition. This transition is due to varied modes of motion of the [(CH₃)₂NH₂]⁺ guest accompanied by a synergistic deformation of the [Cd(N₃)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.</p> </abstract>