Journal
CHEMISTRY OF MATERIALS
Volume 33, Issue 9, Pages 3081-3086Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c04220
Keywords
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Funding
- National Natural Science Foundation of China [21571094, 21861026, 21905127, 22065023]
- Jiangxi province's construction plan of Double-First Class [9166-27040004]
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In this study, new switchable materials were designed and synthesized based on a reported ferroelectric compound. One of the new materials exhibited a phase transition temperature as high as 393K, which is 48K higher than the reported compound, indicating great potential for high-temperature dielectric and NLO molecular switch applications.
Switchable materials with a high phase transition (PT) temperature have drawn much attention in the past few decades due to the wide application in electronic devices. Herein, 2-methyl-2-azabicyclo[2.2.2]octan-2-ium perrhenate ([N-Me-isoQH]ReO4) and 2-azabicyclo[2.2.2]octan-2-ium perrhenate ([isoQH]ReO4) were designed and synthesized by molecular modification based on the reported ferroelectric compound quinuclidinium perrhenate (HQReO(4)). Their crystal symmetries at room temperature decrease mainly owing to the cation-ion interaction and hydrogen-bond interaction between the cations and anions from [N-Me-isoQH]ReO4 to the reported HQReO(4) and to [isoQH]ReO4. However, their PT transition temperatures increase in the order of [N-Me-isoQH]ReO4, HQReO(4), and [isoQH]ReO4. [isoQH]ReO4 showed a high PT temperature of 393 K, which is 48 K higher than that of reported HQReO(4), and experienced a symmetry change from noncentrosymmetric point group C-2 to centrosymmetric point group C-4h. Its reversible dielectric and SHG behaviors make it a promising high-temperature dielectric and NLO molecular switch.
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