期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 9, 期 25, 页码 8076-8082出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1tc01568k
关键词
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资金
- NSFC [21971091, 22071273, 21901089]
- NSF of Jiangxi Province [20192ACB20013]
- Funds for Creative Research Groups of China [21821003]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01C161]
A novel crystalline dielectric with a rare four-step thermosensitive dielectric response has been discovered, where the rotation/jumping of the Me2EtNH+ ions is influenced by the deformability of the host supramolecular cages.
Molecular dielectrics with temperature-tuned dipolar motion can function as thermosensitive electropolarized materials in smart devices. Up to now, most research was limited to the dipolar motion of simple and symmetric structures, yet more complicated dielectric responses for low-symmetry dipoles in deformable space were scarcely known but quite meaningful. Here we report such a crystalline dielectric with Me2EtNH+ as a low-symmetry dipolar cation enclosed by host [Ni(NCS)(6)](4-) anions, namely (Me2EtNH)(4)[Ni(NCS)(6)]. Upon heating, it exhibits a rarely observed four-step thermosensitive dielectric response accompanying multiple structural phase transitions, owing to gradually enhanced rotation/jumping of the Me2EtNH+ ions confined in deformable supramolecular cages. The motion dynamics of this low-symmetry cation is anisotropic and strongly affected by the flexible deformability of the host supramolecular cages, suggesting a complexity of molecular dynamics in such a simple crystalline salt.
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