A ferroelectric proton conductor with colossal polarization induced by in-plane symmetry breaking in a two-dimensional coordination polymer.

ABSTRACT: Noncentrosymmetric two-dimensional (2D) coordination polymers/metal-organic frameworks (CPs/MOFs) are very rare and their functionalities have not been explored. Herein, we report the first 2D ferroelectric proton conductor based on cyanido-bridged undulating 2D CPs. [Mn(salen)]₂[ReN(CN)₄(MeCN)]·H₂O (MnReMeCN·H₂O) crystallized in the Pna2₁ space group and underwent in-plane symmetry breaking upon incorporation of water within the crystal layers. Thus, the dehydrated MnReMeCN layers were centrosymmetric and exhibited reversible switching of second harmonic generation induced by water vapor. The ferroelectricity of MnReMeCN·H₂O was strongly coupled with ion conduction, yielding a colossal polarization of 21 mC cm^-2

SUBMITTER: Song Y 

PROVIDER: S-EPMC12198974 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature