title: A Hydrogen-Bonded Cyanide-Bridged [Co2Fe2] Square Complex Exhibiting a Three-Step Spin Transition.
abstract: Co-crystallization of a cyanide-bridged tetranuclear complex [Co2Fe2] with 4-cyanophenol (CP) gave a hydrogen bonding donor-acceptor system, [Co2Fe2(bpy*)4(CN)6(tp*)2](PF6)2⋅2 CP⋅8 BN (1). 1 exhibited a three-step phase transition between HT, IM1, IM2, and LT phases upon temperature variation. Variable temperature magnetic measurements and structural analyses revealed that the three-step spin transition is caused by electron-transfer-coupled spin transitions (ETCSTs) accompanied with alteration of the hydrogen bonding interactions.
authors.affiliation: Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, Japan.|JST, PRESTO, Honcho 4-1-8, Kawaguchi, Saitama, 332-0012, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Nihei
authors.affiliation: Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, Japan.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Yanai
authors.affiliation: Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei, 106008, Taiwan.
authors.forename: I-Jui
authors.initials: IJ
authors.lastname: Hsu
authors.affiliation: Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Sekine
authors.affiliation: Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Oshio
keywords: cobalt; cyanides; hydrogen bonds; mixed-valent compounds; spin transition