Issue 24, 2020

Enhanced dielectricity coupled to spin-crossover in a one-dimensional polymer iron(ii) incorporating tetrathiafulvalene

Abstract

In designing multifunctional materials for potential switches that can be used as memory devices, the high-spin (HS) to low-spin (LS) crossover (SCO) one-dimensional polymer, [FeII(L)(4,4′-bpy)]n, was constructed from a designed redox-active tetrathiafulvalene (TTF) functionalized Schiff-base and the ditopic linker 4,4′-bipyridine (bpy). It exhibits an 8 K hysteretic SCO centred at T1/2 = 325 K which is coupled to changes in its dielectric constant. The crystal structures above and below the transition temperature reveal similar parallel linear ⋯Fe–bpy–Fe–bpy⋯ chains displaying expansion of the FeII octahedron in the HS state. Density functional theory (DFT) calculations reveal a concerted electronic charge and spin change represented by the Mülliken charge of the Fe and the magnitude and direction of the dipole moment which substantiate the experimental observations.

Graphical abstract: Enhanced dielectricity coupled to spin-crossover in a one-dimensional polymer iron(ii) incorporating tetrathiafulvalene

Supplementary files

Article information

Article type
Edge Article
Submitted
28 Apr. 2020
Accepted
27 Maijs 2020
First published
27 Maijs 2020
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2020,11, 6229-6235

Enhanced dielectricity coupled to spin-crossover in a one-dimensional polymer iron(II) incorporating tetrathiafulvalene

Y. Qiu, L. Cui, P. Cai, F. Yu, M. Kurmoo, C. F. Leong, D. M. D'Alessandro and J. Zuo, Chem. Sci., 2020, 11, 6229 DOI: 10.1039/D0SC02388D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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