THE QUANTUM EFFICIENCY OF THE PHOTO-EXCITATION IN A Fe (II) SPIN-CROSSOVER COMPOUND
THE QUANTUM EFFICIENCY OF THE PHOTO-EXCITATION IN A Fe (II) SPIN-CROSSOVER COMPOUND
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Fe(II)自旋交叉化合物中光激发的量子效率
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Hauser
中科院分区：
文献类型：
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作者：
C. Enachescu;Ulrich Oetliker;A. Hauser
在本文中，我们讨论了自旋交叉化合物的量子效率。自旋交叉固体是光可切换材料的教科书示例，其呈现从低温下热力学稳定的反磁低自旋态到高温下成为热力学稳定态的顺磁高自旋态的热自旋转变。通过用适当的波长照射它们，它们可以在低于热转变温度的温度下从稳定的低自旋态转变为亚稳态的高自旋态。对于化合物[Fe(pic)3]Cl2·EtOH，有关光转换过程的量子效率（即单个光子转换的分子数量）及其对辐照强度的可能依赖性的问题引起了争议。本文提出的实验结果表明，11 K 时光转换的量子效率处于单位量级，量子效率对光强度没有明显的依赖性。然而，它确实在很小程度上取决于已经转化为高自旋态的复合物的比例。
In this paper we discuss on the quantum efficiency in spin crossover compounds. Spin crossover solids are text-book examples of photo switchable materials that present a thermal spin transition from the diamagnetic low-spin state, thermodynamically stable at low temperatures, to the paramagnetic high-spin state becoming the thermodynamically stable state at elevated temperature. By irradiating them with an appropriate wavelength, they can pass from the stable low spin state to the metastable high spin state at temperatures below the thermal transition temperature. For the compound [Fe(pic)3]Cl2·EtOH, the question regarding the quantum efficiency of the photo-conversion process that is the number of molecules converted by one single photon and its possible dependency on irradiation intensity gave rise to a controversy. The experimental results presented in this paper demonstrate that the quantum efficiency of the photo-conversion at 11 K is on the order of unity, with no noticeable dependency of the quantum efficiency on light intensity. It does, however, depend to a small extent on the fraction of complexes already converted to the high-spin state.