Anion-induced ferroelectric polarization in a luminescent metal–organic cage compound

Yadav, A, Srivastava, AK, Kulkarni, P, Divya, P, Steiner, A ORCID: 0000-0002-4315-6123, Praveenkumar, B and Boomishankar, R (2017) Anion-induced ferroelectric polarization in a luminescent metal–organic cage compound Journal of Materials Chemistry C, 5 (40). pp. 10624-10629. ISSN 2050-7534, 2050-7526

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Abstract

Metal-organic crystalline solids with ferroelectric properties have attracted significant attention recently as materials for high-tech applications. Here, we describe two crystalline assemblies that contain cationic metal-organic cages {[Zn<inf>6</inf>(H<inf>2</inf>O)<inf>12</inf>][TPTA]<inf>8</inf>}(NO<inf>3</inf>)<inf>12</inf>·26H<inf>2</inf>O (1) and {[Zn<inf>6</inf>(H<inf>2</inf>O)<inf>12</inf>][TPTA]<inf>8</inf>}(ClO<inf>4</inf>)<inf>12</inf>·18.75H<inf>2</inf>O (2) featuring the tripodal ligand [PS(NH³Py)<inf>3</inf>] (TPTA). Ferroelectric measurement on a single crystal of 1 gave a remnant (P<inf>r</inf>) polarization of 1.2 μC cm^-2 at room temperature. The ferroelectric response originates from the toggling of nitrate anions and solvate molecules found in pockets between the cages. The temperature-dependent permittivity of 1 shows an anomalous dielectric peak at 20 °C. This is attributed to the desolvation-assisted dielectric relaxation behaviour and signifies the role of solvate molecules in the ferroelectric behaviour of 1. In addition, this material is highly luminescent exhibiting a bright blue emission under UV light. This multifunctional behaviour is unique among metal-organic cage frameworks.

Item Type:	Article
Uncontrolled Keywords:	3402 Inorganic Chemistry, 3403 Macromolecular and Materials Chemistry, 34 Chemical Sciences, 40 Engineering, 4016 Materials Engineering
Depositing User:	Symplectic Admin
Date Deposited:	10 Oct 2017 13:38
Last Modified:	01 Mar 2026 08:43
DOI:	10.1039/C7TC03375C
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3009932
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