An unusual high-frequency ferroelectric obtained via the post-synthetic modification of a metal–organic framework

Abstract

Ferroelectrics as crucial functional materials have attracted much interest since ferroelectricity was discovered in 1920. Herein, an unusual high-frequency ferroelectric, (CH₃)₂NH·HCl@Cd-MOF, was successfully obtained through a dual-step synthetic methodology. A chiral porous Cd-MOF with a channel size of 6.8 × 6.8 Å was synthesized via self-assembly of chiral Schiff-base ligands and Cd²⁺ ions. Subsequently, polarizable (CH₃)₂NH·HCl was introduced into the channels of the Cd-MOF and hence the host–guest system (CH₃)₂NH·HCl@Cd-MOF was formed. The as-synthesized (CH₃)₂NH·HCl@Cd-MOF displays obvious ferroelectricity at a high frequency of 1 kHz. Such a high-frequency ferroelectric is extremely rare among MOF-based ferroelectric materials, and the high-frequency ferroelectricity means that (CH₃)₂NH·HCl@Cd-MOF has potential for use in ferroelectric memories. The results again demonstrate that post-synthetic modification is a promising approach for achieving rational and precise design of ferroelectric materials.