Volume 55, Issue 17 pp. 5184-5189
Communication

Direct Observation of Ordered High-Spin–Low-Spin Intermediate States of an Iron(III) Three-Step Spin-Crossover Complex

Dr. Zhao-Yang Li

Dr. Zhao-Yang Li

Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578 Sendai, Japan

These authors contributed equally to this work.

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Dr. Hiroyoshi Ohtsu

Dr. Hiroyoshi Ohtsu

Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), RIST Building 3-3390, 77 Cheongam-Ro, Nam-Gu, Pohang, South Korea

These authors contributed equally to this work.

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Dr. Tatsuhiro Kojima

Dr. Tatsuhiro Kojima

Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043 Japan

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Dr. Jing-Wei Dai

Corresponding Author

Dr. Jing-Wei Dai

Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578 Sendai, Japan

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Takefumi Yoshida

Takefumi Yoshida

Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578 Sendai, Japan

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Dr. Brian K. Breedlove

Dr. Brian K. Breedlove

Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578 Sendai, Japan

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Dr. Wei-Xiong Zhang

Dr. Wei-Xiong Zhang

MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275 P.R. China

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Dr. Hiroaki Iguchi

Dr. Hiroaki Iguchi

Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578 Sendai, Japan

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Prof. Osamu Sato

Corresponding Author

Prof. Osamu Sato

Institute for Materials Chemistry and Engineering, Kyushu University, 6-10-1 Hakozaki, Higashiku, Fukuoka, 812-8581 Japan

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Prof. Masaki Kawano

Prof. Masaki Kawano

Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), RIST Building 3-3390, 77 Cheongam-Ro, Nam-Gu, Pohang, South Korea

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Prof. Masahiro Yamashita

Corresponding Author

Prof. Masahiro Yamashita

Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578 Sendai, Japan

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First published: 17 March 2016
Citations: 70

Graphical Abstract

In quite a state: A neutral mononuclear FeIII complex [FeIII(H-5-Br-thsa-Me)(5-Br-thsa-Me)]⋅H2O (thsa=5-bromosalicylaldehyde methylthiosemicarbazone) exhibited a three-step spin crossover with symmetry breaking and a 14 K hysteresis loop owing to strong cooperativity (see picture). The intermediate spin states showed remarkable long-range 4 HS–2 LS and 2 HS–4 LS spin-state ordering (HS=high-spin, red; LS=low-spin, green).

Abstract

A neutral mononuclear FeIII complex [FeIII(H-5-Br-thsa-Me)(5-Br-thsa-Me)]⋅H2O (1; H2-5-Br-thsa-Me=5-bromosalicylaldehyde methylthiosemicarbazone) was prepared that exhibited a three-step spin-crossover (SCO) with symmetry breaking and a 14 K hysteresis loop owing to strong cooperativity. Two ordered intermediate states of 1 were observed, 4HS–2LS and 2HS–4LS, which exhibited reentrant phase-transition behavior. This study provides a new platform for examining multistability in SCO complexes.

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