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Room-temperature pyroelectric crystal based on a neutral iron(III) spin-crossover compound
Zi-Xuan Fan, Wei Lu, Zhao-Ping Ni*, Ming-Liang Tong
https://doi.org/10.1016/j.cjsc.2026.101013
Pyroelectric; Spin crossover; Iron; Halogen
ABSTRACT
Pyroelectric materials constitute the functional cornerstone of thermal imaging, infrared sensing, and energy harvesting. However, the realization of high-performance and environmentally benign pyroelectric materials that operate robustly at room temperature remains a critical challenge. Herein, we report two neutral mononuclear Fe(Ⅲ) compounds exhibiting incomplete spin crossover (SCO) behavior. The strategic introduction of the chlorine substituent not only modulates the SCO properties but also induces non-centrosymmetric crystal packing. Notably, the incomplete spin transition gives rise to a remarkable polarization change of 0.78 μC cm−2 across 150–300 K. At 298 K, it exhibits a pyroelectric coefficient of 10.6 nC K−1 cm−2. The voltage responsivity and detectivity reach 1.18 m2 C-1 and 3.01 × 10−5 Pa−1/2, respectively, exceeding the corresponding values for commercial polyvinylidene fluoride (PVDF) and lead zirconate titanate (PZT). These results establish a rational molecular design principle that concurrently enforces non-centrosymmetric crystal symmetry and realizes spin-state-driven polarization, thereby providing a viable pathway toward multifunctional magnetoelectric materials.
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CN 35–1112/TQ, ISSN 0254–5861, Online ISSN: 2949-768X Copyright @ 2022 Chinese Journal of Structural Chemistry-www.Chinese Journal of Structural Chemistry.net. All Rights Reserved 闽ICP备2022002645号-1