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원자제어 저차원 전자계 연구단
원자제어 저차원 전자계 연구단
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Soft X-ray absorption spectroscopy study of spin crossover Fe-compounds: Persistent high spin configurations under soft X-ray irradiation

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Title
Soft X-ray absorption spectroscopy study of spin crossover Fe-compounds: Persistent high spin configurations under soft X-ray irradiation
Author(s)
Ahmed Yousef Mohamed; Minji Lee; Kosuke Kitase; Takafumi Kitazawa; Jae-Young Kim; Deok-Yong Cho
Publication Date
2018-11
Journal
Crystals, v.8, no.11, pp.433 -
Publisher
MDPI
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. (C) 2018 by the authors. Licensee MDPI, Basel, Switzerland
URI
https://pr.ibs.re.kr/handle/8788114/5332
ISSN
2073-4352
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > Journal Papers (저널논문)
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