title: Direct Observation of Ordered High-Spin-Low-Spin Intermediate States of an Iron(III) Three-Step Spin-Crossover Complex.
abstract: A neutral mononuclear Fe(III) complex [Fe(III) (H-5-Br-thsa-Me)(5-Br-thsa-Me)]⋅H2 O (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.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578, Sendai, Japan.
authors.forename: Zhao-Yang
authors.initials: ZY
authors.lastname: Li
authors.affiliation: Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), RIST Building 3-3390, 77 Cheongam-Ro, Nam-Gu, Pohang, South Korea.
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Ohtsu
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan.
authors.forename: Tatsuhiro
authors.initials: T
authors.lastname: Kojima
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578, Sendai, Japan. jingweiii@gmail.com.
authors.forename: Jing-Wei
authors.initials: JW
authors.lastname: Dai
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578, Sendai, Japan.
authors.forename: Takefumi
authors.initials: T
authors.lastname: Yoshida
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578, Sendai, Japan.
authors.forename: Brian K
authors.initials: BK
authors.lastname: Breedlove
authors.affiliation: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, 510275, P.R. China.
authors.forename: Wei-Xiong
authors.initials: WX
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578, Sendai, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Iguchi
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 6-10-1 Hakozaki, Higashiku, Fukuoka, 812-8581, Japan. sato@cm.kyushu-u.ac.jp.
authors.forename: Osamu
authors.initials: O
authors.lastname: Sato
authors.affiliation: Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), RIST Building 3-3390, 77 Cheongam-Ro, Nam-Gu, Pohang, South Korea.
authors.forename: Masaki
authors.initials: M
authors.lastname: Kawano
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, 980-8578, Sendai, Japan. yamasita.m@gmail.com.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamashita
keywords: cooperativity; iron; multistability; spin crossover; symmetry breaking