title: Hexagonal supramolecular architectures from ferrocenium cations incorporating [Ni(mnt)2]- columns: structures and properties of [alkylferrocene][Ni(mnt)2]- charge-transfer complexes (mnt=maleonitriledithiolate).
abstract: The crystal architecture, magnetic properties, and thermodynamic properties of [n-butylferrocene][Ni(mnt)2] (1), [tert-butylferrocene][Ni(mnt)2] (2), [1,1'-diethylferrocene][Ni(mnt)2] (3), and [1,1'-diisopropylferrocene][Ni(mnt)2] (4) were investigated (mnt=maleonitriledithiolate). These complexes exhibit a unique supramolecular structure in which the ferrocenium cations constitute honeycomb-like assembled structures surrounding columns of the anions. For 1, the cations form a dimer through a very short intermolecular ferrocene-ferrocene distance of 3.28 A, which mediates an antiferromagnetic interaction with a singlet-triplet energy gap of 5 K. First-order phase transitions occur in 1-3 at 364, 361, and 350 K, respectively, accompanied by thermal hysteresis.
authors.affiliation: Department of Chemistry, Faculty of Science, Toho University, Miyama, Funabashi, Chiba 274-8510, Japan. mochida@chem.sci.toho-u.ac.jp
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Mochida
authors.forename: Takeo
authors.initials: T
authors.lastname: Koinuma
authors.forename: Takahiro
authors.initials: T
authors.lastname: Akasaka
authors.forename: Michiko
authors.initials: M
authors.lastname: Sato
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nishio
authors.forename: Koji
authors.initials: K
authors.lastname: Kajita
authors.forename: Hatsumi
authors.initials: H
authors.lastname: Mori