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A guideline to the design of molecular-based materials with long-lived photomagnetic lifetimes

机译：光磁寿命长的分子基材料设计指南

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摘要

Materials presenting a stable and reversible switch of physical properties in the solid state are of major interest either for fundamental interests or potential industrial applications. In this context. the design of metal complexes showing a light-induced crossover from one spin state to another, leading to a major change of magnetic and optical properties, is probably one of the most appealing challenges. The so-denoted spin-crossover materials undergo, in some cases, a reversible photoswitch between two magnetic states, but, unfortunately, lifetimes of the photomagnetic states for compounds known so far are long enough only at low temperatures; this prohibits any applications. We have measured and collected the temperatures above which the photomagnetic effect disappears for more than sixty spin-crossover compounds. On the basis of this large data base, a correlation between the nature of the coordination sphere of the metal and the photomagnetic lifetime can be drawn. Such correlation allows us to propose here a general guideline for the rational design of materials with long-lived photomagnetic lifetimes. This result clearly opens the way towards room-temperature photonic materials, based on the spin-crossover phenomenon, which will be of great interest for future communication devices.
机译：在基本状态或潜在的工业应用中，具有稳定的和可逆的固态物理性能转换的材料引起了人们的极大兴趣。在这种情况下。金属配合物的设计显示出光诱导的从一种自旋态转变为另一种自旋态，从而导致磁性和光学性质发生重大变化，这可能是最吸引人的挑战之一。在某些情况下，所谓的自旋交联材料会在两个磁态之间发生可逆的光开关，但不幸的是，到目前为止，已知化合物的光磁态寿命只有在低温下才足够长。这禁止任何应用程序。我们已经测量并收集了超过60种自旋交联化合物的光磁效应消失的温度。基于这个庞大的数据库，可以得出金属配位球的性质与光磁寿命之间的相关性。这种相关性使我们能够在此处提出合理设计具有长寿命光磁寿命的材料的一般准则。该结果显然基于自旋交叉现象为室温光子材料开辟了道路，这将对未来的通信设备引起极大的兴趣。

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