首页|Two new high-temperature molecular ferroelectrics[1,5-3.2.2-Hdabcn]X(X=ClO4-,ReO4-)

Two new high-temperature molecular ferroelectrics[1,5-3.2.2-Hdabcn]X(X=ClO4-,ReO4-)

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Molecular ferroelectrics have attracted much attention because of their excellent piezoelectricity,me-chanical workability,and second harmonic effect.Here,we successfully prepared two molecular fer-roelectrics[1,5-3.2.2-Hdabcn]X(X=ClO4-,1;ReO4-,2)by reactions of a quasi-spherical amine 1,5-diazabicycle[3.2.2]nonane(1.5-3.2.2-dabcn)with HX aqueous solution.Compounds 1 and 2 undergo high-temperature phase transitions at 381K(1)and 396K(2).Before and after the phase transition,they crystallize in the polar point group mm2,and the centrosymmetric point groups mmm and 4/mmm,re-spectively.According to Aizu rules,these two compounds experience mmmFmm2 and 4/mmmFmm2 type ferroelectric phase transitions,respectively.The ferroelectricity of both compounds is well expressed in their polycrystalline film at room temperature with low coercive voltages of 13 V for 1 and 25 V for 2.Us-ing piezoelectric force microscopy(PFM),the 180° anti-parallel ferroelectric domains and the reversible polarization switching can be clearly observed in 1 and 2.This high-temperature molecular ferroelec-tric material has great application potential in flexible materials,biomechanics,intelligent wearables and other fields.

Ferroelectric domainsQuasi-spherical aminePhase transitionPolarization

Keke Han、Wenjun Rao、Xiuli You、Haina Zhang、Xing Ye、Zhenhong Wei、Hu Cai

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School of Chemistry and Chemical Engineering,Nanchang University,Nanchang 330031,China

Jiangxi Key laboratory of Organic Chemistry,Jiangxi Science and Technology Normal University,Nanchang 330013,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaDepartment of Science and Technology in Jiangxi Province

21865015220710942207512320213BCJ22055

2024

10.1016/j.cclet.2023.108809

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(6)