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Crystals 2018, 8(11), 433; https://doi.org/10.3390/cryst8110433

Soft X-ray Absorption Spectroscopy Study of Spin Crossover Fe-Compounds: Persistent High Spin Configurations under Soft X-ray Irradiation

1
IPIT & Department of Physics, Chonbuk National University, Jeonju 54896, Korea
2
Department of Physics, South Valley University, Qena 83523, Egypt
3
Department of Chemistry, Toho University, Chiba 274-8510, Japan
4
Research Centre for Materials with Integrated Properties, Toho University, Chiba 274-8510, Japan
5
Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Korea
*
Author to whom correspondence should be addressed.
Received: 19 October 2018 / Revised: 12 November 2018 / Accepted: 16 November 2018 / Published: 19 November 2018
(This article belongs to the Special Issue Synthesis and Applications of New Spin Crossover Compounds)
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Abstract

Metal-organic complex exhibiting spin crossover (SCO) behavior has drawn attention for its functionality as a nanoscale spin switch. The spin states in the metal ions can be tuned by external stimuli such as temperature or light. This article demonstrates a soft X-ray–induced excited spin state trapping (SOXEISST) effect in Hofmann-like SCO coordination polymers of FeII(4-methylpyrimidine)2[Au(CN)2]2 and FeII(pyridine)2[Ni(CN)4]. A soft X-ray absorption spectroscopy (XAS) study on these polymers showed that the high spin configuration (HS; S = 2) was prevalent in Fe2+ ions during the measurement even at temperatures much lower than the critical temperatures (>170 K), manifesting HS trapping due to the X-ray irradiation. This is in strong contrast to the normal SCO behavior observed in FeII(1,10-phenanthroline)2(NCS)2, implying that the structure of the ligand chains in the polymers with relatively loose Fe-N coordination might allow a structural adaptation to stabilize the metastable HS state under the soft X-ray irradiation. View Full-Text
Keywords: spin crossover; X-ray absorption spectroscopy; soft X-ray induced excited spin state trapping; high spin spin crossover; X-ray absorption spectroscopy; soft X-ray induced excited spin state trapping; high spin
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Mohamed, A.Y.; Lee, M.; Kitase, K.; Kitazawa, T.; Kim, J.-Y.; Cho, D.-Y. Soft X-ray Absorption Spectroscopy Study of Spin Crossover Fe-Compounds: Persistent High Spin Configurations under Soft X-ray Irradiation. Crystals 2018, 8, 433.

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