title: Influence of Intermolecular Interactions on Valence Tautomeric Behaviors in Two Polymorphic Dinuclear Cobalt Complexes.
abstract: Two polymorphic structures have been well determined in a valence tautomeric (VT) dinuclear cobalt complex. These polymorphs showed distinct thermal- and photomagnetic behavior, and are thus ideal for studying the "pure" intermolecular factors to VT transitions. In polymorph 1A, the VT cations are arranged head-to-waist with their neighbors and exhibit weak π⋅⋅⋅π interactions, resulting in a gradual and incomplete thermal VT transition. In contrast, the cations in polymorph 1B are arranged head-to-tail and exhibit relatively strong π⋅⋅⋅π interactions, leading to an abrupt and complete thermal VT transition with adjustable hysteresis loop at around room temperature. The VT process for both polymorphs can be induced by light, but the light-excited state of 1B⋅2H2O has a higher thermal relaxation temperature than that of 1A⋅3H2O.
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: Guo-Ling
authors.initials: GL
authors.lastname: Li
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Kanegawa
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: Zi-Shuo
authors.initials: ZS
authors.lastname: Yao
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: Sheng-Qun
authors.initials: SQ
authors.lastname: Su
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: Shu-Qi
authors.initials: SQ
authors.lastname: Wu
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: You-Gui
authors.initials: YG
authors.lastname: Huang
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: Soonchul
authors.initials: S
authors.lastname: Kang
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka Nishi-ku, 819-0395, Fukuoka, Japan.
authors.forename: Osamu
authors.initials: O
authors.lastname: Sato
keywords: hysteretic transition; intermolecular interactions; magnetism; polymorphism; valence tautomerism