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

Ahmed Yousef Mohamed; Minji Lee; Kosuke Kitase; Takafumi Kitazawa; Jae Young Kim; Deok Yong Cho

doi:10.3390/cryst8110433

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

Ahmed Yousef Mohamed
, Minji Lee
, Kosuke Kitase
, Takafumi Kitazawa
, Jae Young Kim
, Deok Yong Cho^*

^*Corresponding author for this work

Department of Physics

Jeonbuk National University
Qena University
Toho University
Institute for Basic Science

Research output: Contribution to journal › Journal article › peer-review

14 Scopus citations

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 Fe^II (4-methylpyrimidine)₂ [Au(CN)₂ ]₂ and Fe^II (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 Fe^II (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.

Original language	English
Article number	433
Journal	Crystals
Volume	8
Issue number	11
DOIs	https://doi.org/10.3390/cryst8110433
State	Published - 2018.11.19

Keywords

High spin
Soft X-ray induced excited spin state trapping
Spin crossover
X-ray absorption spectroscopy

Quacquarelli Symonds(QS) Subject Topics

Materials Science
Engineering - Chemical
Chemistry
Physics & Astronomy

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10.3390/cryst8110433

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@article{703a7a6dedf54ff097cb79b1d7f1b181,

title = "Soft X-ray absorption spectroscopy study of spin crossover Fe-compounds: Persistent high spin configurations under soft X-ray irradiation",

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{\textendash}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.",

keywords = "High spin, Soft X-ray induced excited spin state trapping, Spin crossover, X-ray absorption spectroscopy",

author = "Mohamed, \{Ahmed Yousef\} and Minji Lee and Kosuke Kitase and Takafumi Kitazawa and Kim, \{Jae Young\} and Cho, \{Deok Yong\}",

note = "Publisher Copyright: {\textcopyright} 2018 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2018",

month = nov,

day = "19",

doi = "10.3390/cryst8110433",

language = "English",

volume = "8",

journal = "Crystals",

issn = "2073-4352",

number = "11",

}

TY - JOUR

T1 - Soft X-ray absorption spectroscopy study of spin crossover Fe-compounds

T2 - Persistent high spin configurations under soft X-ray irradiation

AU - Mohamed, Ahmed Yousef

AU - Lee, Minji

AU - Kitase, Kosuke

AU - Kitazawa, Takafumi

AU - Kim, Jae Young

AU - Cho, Deok Yong

PY - 2018/11/19

Y1 - 2018/11/19

N2 - 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.

AB - 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.

KW - High spin

KW - Soft X-ray induced excited spin state trapping

KW - Spin crossover

KW - X-ray absorption spectroscopy

UR - https://www.scopus.com/pages/publications/85057278349

U2 - 10.3390/cryst8110433

DO - 10.3390/cryst8110433

M3 - Journal article

AN - SCOPUS:85057278349

SN - 2073-4352

VL - 8

JO - Crystals

JF - Crystals

IS - 11

M1 - 433

ER -

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

Abstract

Keywords

Quacquarelli Symonds(QS) Subject Topics

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