Giant thermal expansion associated with a macroscopic polarization change in a single crystal of a Zn(<scp>ii</scp>) complex

Tang, Zheng; Liu, Chengdong; Zhang, Yan; Sun, Xiao-Peng; Tao, Jun; Yao, Zi‐Shuo

doi:10.1039/d2qi02371g

“…[29][30][31] It can be envisioned that if the macroscopic polarization is involved in a large unit-cell variation, a substantial pyroelectric response could be achieved. [32] To this end, our research endeavors are focused on spin crossover (SCO) compounds that are well-known as magnetic bistable materials. [33][34][35] In these compounds, the metal centers with 3d 4 -3d 7 electronic configurations can be interconverted between low-spin (LS) and high-spin (HS) states through thermal treatment.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, remarkable instances of flexible molecular single crystals that manifest substantial thermal expansion and even temperature‐dependent distinctive shape transformations have been reported [29–31] . It can be envisioned that if the macroscopic polarization is involved in a large unit‐cell variation, a substantial pyroelectric response could be achieved [32] …”

Section: Introductionmentioning

confidence: 99%

High‐performance Pyroelectric Property Accompanied by Spin Crossover in a Single Crystal of Fe(II) Complex

Liu,

Li,

Tang

et al. 2024

Angewandte Chemie

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Pyroelectric materials hold significant potential for energy harvesting, sensing, and imaging applications. However, achieving high‐performance pyroelectricity across a wide temperature range near room temperature remains a significant challenge. Herein, we demonstrate a single crystal of Fe(II) spin‐crossover compound shows remarkable pyroelectric properties accompanied by a thermally controlled spin transition. In this material, the uniaxial alignment of polar molecules results in a polarization of the lattice. As the molecular geometry is modulated during a gradual spin transition, the polar axis experiences a colossal thermal expansion with a coefficient of 796 × 10−6 K−1. Consequently, the material’s polarization undergoes significant modulation as a secondary pyroelectric effect. The considerable shift in polarization (pyroelectric coefficient, p = 3.7~22 nC K−1cm−2), coupled with a low dielectric constant (ε' = 4.4~5.4) over a remarkably wide temperature range of 298 to 400 K, suggests this material is a high‐performance pyroelectric. The demonstration of pyroelectricity combined with magnetic switching in this study will inspire further investigations in the field of molecular electronics and magnetism.

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High‐performance Pyroelectric Property Accompanied by Spin Crossover in a Single Crystal of Fe(II) Complex

Liu,

Li,

Tang

et al. 2024

Angew Chem Int Ed

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7

0

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Pyroelectric materials hold significant potential for energy harvesting, sensing, and imaging applications. However, achieving high‐performance pyroelectricity across a wide temperature range near room temperature remains a significant challenge. Herein, we demonstrate a single crystal of Fe(II) spin‐crossover compound shows remarkable pyroelectric properties accompanied by a thermally controlled spin transition. In this material, the uniaxial alignment of polar molecules results in a polarization of the lattice. As the molecular geometry is modulated during a gradual spin transition, the polar axis experiences a colossal thermal expansion with a coefficient of 796 × 10−6 K−1. Consequently, the material’s polarization undergoes significant modulation as a secondary pyroelectric effect. The considerable shift in polarization (pyroelectric coefficient, p = 3.7~22 nC K−1cm−2), coupled with a low dielectric constant (ε' = 4.4~5.4) over a remarkably wide temperature range of 298 to 400 K, suggests this material is a high‐performance pyroelectric. The demonstration of pyroelectricity combined with magnetic switching in this study will inspire further investigations in the field of molecular electronics and magnetism.

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Hydrogen-bonded nickel(II)-organosulfonate framework: Thermal expansion behavior, proton conduction, and magnetic properties

Zhang

¹

,

Shi

²

,

Liu

³

et al. 2023

Journal of Molecular Structure

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Giant thermal expansion associated with a macroscopic polarization change in a single crystal of a Zn(ii) complex

Abstract: In this study, we prepared a polar flexible single crystal of [Zn(4-ethylpyridine)2(NCS)2]. This material shows unusually large anisotropic linear thermal expansion as the tetrahedral coordination geometry of the complex can...

Cited by 4 publications

References 67 publications

High‐performance Pyroelectric Property Accompanied by Spin Crossover in a Single Crystal of Fe(II) Complex

High‐performance Pyroelectric Property Accompanied by Spin Crossover in a Single Crystal of Fe(II) Complex

High‐performance Pyroelectric Property Accompanied by Spin Crossover in a Single Crystal of Fe(II) Complex

Hydrogen-bonded nickel(II)-organosulfonate framework: Thermal expansion behavior, proton conduction, and magnetic properties

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