Prajesh, Neetu, Yadav, Ashok, Gourkhede, Rani, Praveenkumar, Balu, Steiner, Alexander 
ORCID: 0000-0002-4315-6123 and Boomishankar, Ramamoorthy
(2020)
Ferroelectric Behavior of an Octahedral Metal-Ligand Cage and Its 2D-Connected Cage Framework.
CHEMISTRY-AN ASIAN JOURNAL, 15 (20).
pp. 3275-3280.
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Abstract
Supramolecular systems hold great potential as ferroelectric materials because they are easy to prepare and do not require toxic and environmentally damaging elements. However, directing the self-assembly process of a supramolecular array to yield polarizable solids is still challenging. Here, we describe induced ferroelectricity in a supramolecular framework of metal-organic cages that are supported by a flexible tripodal ligand (NHCH<sub>2</sub> -(3-Py))<sub>3</sub> PO (TPPA). Ferroelectric responses on the discrete cage [Cu<sub>6</sub> (H<sub>2</sub> O)<sub>12</sub> (TPPA)<sub>8</sub> ](NO<sub>3</sub> )<sub>12</sub> ⋅ 45H<sub>2</sub> O (1) and its 2D-connected framework [{Cu<sub>6</sub> Cl<sub>4</sub> (H<sub>2</sub> O)<sub>6</sub> (TPPA)<sub>8</sub> }(NO<sub>3</sub> )<sub>8</sub> ⋅ 60H<sub>2</sub> O]<sub>n</sub> (2) yielded well-resolved rectangular hysteresis loops at room temperature with remnant polarization values of 27.27 and 29.09 μC/cm<sup>2</sup> , respectively. Thermal hysteresis measurements (THM) and capacitance-voltage (C-V) plots further corroborate the ferroelectric behavior in these compounds. The polarization in them is due to the displacements of solvated molecules and nitrate ions in the pockets of these frameworks.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | cage compounds, P-N ligands, polar order, ferroelectricity, dielectric constants |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 14 Nov 2023 16:34 |
| Last Modified: | 14 Nov 2023 16:34 |
| DOI: | 10.1002/asia.202000744 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3176800 |
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