Temperature-dependent EXAFS study for spin crossover complex: Fe(pyridine)2Ni(CN)4

We report the element-specific electronic and local structures of the two-dimensional Hofmann-type spin crossover (SCO) compound Fe(pyridine)2Ni(CN)4 via the X-ray absorption fine structure (XAFS) technique. Fe K-edge XAFS reveals the peak shifts across the SCO transition. On the other hand, the peak positions of Ni K-edges remain unchanged, which suggests that the SCO originates only from the transition between high and low spin states in the localized Fe 3d6 electron configuration. We found that the clear pre-edge structures in Fe and Ni K-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.

We report the element specific electronic and local structures of two-dimensional Hofmann-type spin crossover (SCO) compound Fe(pyridine)2Ni(CN)4 by using X-ray absorption fine structure (XAFS) technique. Fe K-edge XAFS reveals the peak shifts across the SCO transition. On the other hand, the peak positions of Ni K-edges remain unchanged, which suggests that the SCO originates only from the transition between high and low spin states in the Fe 3d6 electron configuration. The local structures around Fe and Ni ions revealed by extended XAFS are consistent with those determined by X-ray diffraction.Figure optionsDownload as PowerPoint slide