Temperature-dependent EXAFS study for spin crossover complex: Fe(pyridine)2Ni(CN)4
Temperature-dependent EXAFS study for spin crossover complex: Fe(pyridine)2Ni(CN)4
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DOI：
10.1016/j.ica.2014.11.015
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发表时间：
2015-02
影响因子：
2.8
通讯作者：
J. Okabayashi;Shoutaro Ueno;Y. Wakisaka;T. Kitazawa
中科院分区：
文献类型：
--
作者：
J. Okabayashi;Shoutaro Ueno;Y. Wakisaka;T. Kitazawa
利用X射线吸收精细结构（XAFS）技术研究了二维Hofmann型自旋交叉（SCO）化合物Fe（pyridine）2Ni（CN）4的电子结构和局域结构. FeK-edge XAFS揭示了SCO过渡期间的峰值变化。另一方面，NiK边的峰位保持不变，这表明SCO仅起源于局域Fe 3d 6电子组态中的高自旋态和低自旋态之间的跃迁。我们发现，在Fe和NiK边缘XAFS中的清晰的前边缘结构也成为样品结晶度均匀性的探测指纹。扩展XAFS揭示的Fe和Ni离子周围的局部结构与Fe（吡啶）2Ni（CN）4中的X射线衍射确定的结构一致。
We report the element-specific electronic and local structures of the two-dimensional Hofmann-type spin crossover (SCO) compound Fe(pyridine)2Ni(CN)4via the X-ray absorption fine structure (XAFS) technique. FeK-edge XAFS reveals the peak shifts across the SCO transition. On the other hand, the peak positions of NiK-edges remain unchanged, which suggests that the SCO originates only from the transition between high and low spin states in the localized Fe 3d6electron configuration. We found that the clear pre-edge structures in Fe and NiK-edge XAFS also become a probing fingerprint for the uniformity in the crystallinity of the sample. The local structures around Fe and Ni ions revealed by extended XAFS are consistent with those determined by X-ray diffraction in Fe(pyridine)2Ni(CN)4.