Issue 30, 2020

Crystal structures and the ferroelectric properties of homochiral metal–organic frameworks constructed from a single chiral ligand

Abstract

MOFs have proven to be promising candidates for designing ferroelectric materials. Herein, two new homochiral MOFs, Co-MOF-1 and Co-MOF-2, have been synthesized using the chiral ligand, HL (HL = phenyl-((pyridin-4-ylmethyl)-amino)-acetic acid), and Co(NO3)2·6H2O. Co-MOF-1 was obtained via a two-step synthetic route involving a hydrogel to Zn-MOF conversion and a dissolution–recrystallization process. Co-MOF-2 was directly synthesized by a coordination reaction between chiral ligand, HL, and Co(NO3)2·6H2O under hydrothermal conditions. We investigate the correlation between the ferroelectric properties of the samples and their crystal structures. The ferroelectric properties of Co-MOF-1 and Co-MOF-2 are drastically different. Indeed, Co-MOF-2 shows an obvious hysteretic behavior, while a clear electric hysteresis loop was not observed for Co-MOF-1. These significant disparities may be attributed to the different molecular dipole moments in Co-MOF-1 and Co-MOF-2. The different octahedral coordination units in the molecular structures of the Co-MOFs may alter the dipole moments of the molecules, resulting in the absence of a hysteresis loop for Co-MOF-1.

Graphical abstract: Crystal structures and the ferroelectric properties of homochiral metal–organic frameworks constructed from a single chiral ligand

Supplementary files

Article information

Article type
Paper
Submitted
10 Apr 2020
Accepted
28 Jun 2020
First published
30 Jun 2020

Dalton Trans., 2020,49, 10402-10406

Crystal structures and the ferroelectric properties of homochiral metal–organic frameworks constructed from a single chiral ligand

X. Xu, M. Liu and Z. Liu, Dalton Trans., 2020, 49, 10402 DOI: 10.1039/D0DT01323D

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