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

被引：12

作者：

Mohamed, Ahmed Yousef ^{[1
,2
,3
]}

Lee, Minji ^{[1
,2
]}

Kitase, Kosuke ^{[4
]}

Kitazawa, Takafumi ^{[4
,5
]}

Kim, Jae-Young ^{[6
]}

Cho, Deok-Yong ^{[1
,2
]}

机构：

[1] Chonbuk Natl Univ, IPIT, Jeonju 54896, South Korea

[2] Chonbuk Natl Univ, Dept Phys, Jeonju 54896, South Korea

[3] South Valley Univ, Dept Phys, Qena 83523, Egypt

[4] Toho Univ, Dept Chem, Chiba 2748510, Japan

[5] Toho Univ, Res Ctr Mat Integrated Properties, Chiba 2748510, Japan

[6] Inst for Basic Sci Korea, Ctr Artificial Low Dimens Elect Syst, Pohang 37673, South Korea

来源：

CRYSTALS | 2018年 / 8卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

spin crossover; X-ray absorption spectroscopy; soft X-ray induced excited spin state trapping; high spin; COMPLEXES; EDGE;

D O I：

10.3390/cryst8110433

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

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.

引用

页数：9

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