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Concerted Spin Crossover and Symmetry Breaking Yield Three Thermally and One Light-Induced Crystallographic Phases of a Molecular Material

机译:协同自旋交越和对称断裂产生分子材料的三个热相和一个光诱导的结晶相

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摘要

Among switchable molecular materials, Fe~(II) spin-crossover (SC) complexes have been widely studied over the last decades. Their reversible low-spin (LS)<=>high-spin (HS) switching triggered by a change in temperature or pressure, or by light irradiation, has attracted much interest for both basic scientific understanding and potential technological applications in information storage or visual displays. In these materials, the coexistence of short-and long-range interactions between molecules yields cooperative effects such as hysteresis and/or two-step transitions. Usually, the SC phenomenon is isostructural, but in a few cases symmetry breaking occurs in the LS phase, alongside intermolecular reorganization.
机译:在过去的几十年中,在可转换的分子材料中,Fe〜(II)自旋交联(SC)络合物得到了广泛的研究。由温度或压力变化或光照射触发的可逆低旋转(LS)=高旋转(HS)开关引起了人们对基础科学理解和信息存储或可视化潜在技术应用的极大兴趣显示。在这些材料中,分子之间短程和长程相互作用的共存会产生协同效应,例如磁滞和/或两步跃迁。通常,SC现象是同构的,但在少数情况下,在LS相中会发生对称破坏,并伴随着分子间的重组。

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