title: Four-component assembly in the crystalline state driven by amidinium-carboxylate salt bridge formation from an aqueous solution.
abstract: A series of diamidine dihydrochlorides was prepared utilizing a spacer unit to control the distance between the two amidinium groups. The introduction of two amidinium groups to the 1,8-position of each spacer unit (i.e., 9,10-dihydroanthracene, anthracene, biphenylene) can control the direction of formation of a self-assembled structure. The fine-tuning of the distances between the two amidinium groups in the spacer units can help control the stabilizing interactions of two carboxylic acid units (intermolecular attraction) after the four-component assembly (see ). Based on this concept, we succeeded in the formation of a four-component box-like assembled structure using amidinium-carboxylate salt bridge formation in the crystalline state from aqueous solutions.
authors.affiliation: Department of Chemistry and Materials Technology, Graduate School of Science and Technology, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan. kusu@kit.ac.jp
authors.forename: Takahiro
authors.initials: T
authors.lastname: Kusukawa
authors.forename: Kazuya
authors.initials: K
authors.lastname: Matsumoto
authors.forename: Hajime
authors.initials: H
authors.lastname: Nakamura
authors.forename: Wataru
authors.initials: W
authors.lastname: Iizuka
authors.forename: Keisuke
authors.initials: K
authors.lastname: Toyama
authors.forename: Shota
authors.initials: S
authors.lastname: Takeshita