Hierarchical Frameworks of Metal-Organic Cages with Axial Ferroelectric Anisotropy

Yadav, Ashok, Kulkarni, Priyangi, Praveenkumar, Balu, Steiner, Alexander ORCID: 0000-0002-4315-6123 and Boomishankar, Ramamoorthy (2018) Hierarchical Frameworks of Metal-Organic Cages with Axial Ferroelectric Anisotropy. CHEMISTRY-A EUROPEAN JOURNAL, 24 (55). pp. 14639-14643.

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Abstract

Designing molecular crystals with switchable dipoles for ferroelectric applications is challenging and often serendipitous. Herein, we show a systematic approach toward hierarchical 1D, 2D and 3D frameworks that are assembled through successive linkage of metal-organic cages [Cu₆ (H₂ O)₁₂ (TPTA)₈ ]¹²⁺ with chloride ions. Their ferroelectric properties are due to the displacement of channel-bound nitrate counterions and solvated water molecules relative to the framework of cages. Ferroelectric measurements of crystals of discrete and 1D-framework assemblies showed axial ferroelectric anisotropy with high remnant polarisation. Both, the reversible formation of cage-connected networks and the observation of ferroelectric anisotropic behaviour are rare among metal-ligand cage assemblies.

Item Type:	Article
Uncontrolled Keywords:	anisotropy, cage compounds, dielectric permittivity, ferroelectricity, polar order
Depositing User:	Symplectic Admin
Date Deposited:	16 Aug 2018 09:02
Last Modified:	19 Jan 2023 01:28
DOI:	10.1002/chem.201803863
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3025093