title: Conformational Transformations of (C12H25NH3(+))(Pyridinesulfonate) in the Solid State.
abstract: The phase-transition behaviors, crystal structures, and dielectric properties of four kinds of simple 1:1 organic salts of (C12H25NH3(+))(benzenesulfonate) and (C12 H25NH3(+))(pyridine sulfonates) were examined from the viewpoint of intermolecular hydrogen-bonding interactions and dynamic conformational transformation in molecular assemblies. Crystals of (C12H25NH3(+))(benzenesulfonate) and (C12H25NH3(+))(3-pyridinesulfonate) were isostructural and solid-solid and solid-liquid-crystal smectic A (SmA) phase transitions were observed. These two crystals formed rodlike cation-anion assemblies. However, the two salts, (C12H25NH3(+))(2-pyridinesulfonate) and (C12H25NH3(+))(4-pyridinesulfonate), formed largely bent L-shaped cation-anion conformations. Interesting conformational transformations from rodlike to L-shaped assemblies were observed in (C12H25NH3(+))(2-pyridinesulfonate) and (C12H25NH3(+))(3-pyridinesulfonate).
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Funada
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
authors.forename: Shota
authors.initials: S
authors.lastname: Uchikawa
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.|Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
authors.forename: Norihisa
authors.initials: N
authors.lastname: Hoshino
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.|Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Takeda
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan. akuta@tagen.tohoku.ac.jp.|Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. akuta@tagen.tohoku.ac.jp.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Akutagawa
keywords: conformation analysis; dielectric properties; ionic crystals; liquid crystals; phase transitions