title: A Molecular Seesaw Balance: Evaluation of Solvent and Counteranion Effects on Pyridinium-π Interactions.
abstract: A molecular seesaw balance 1·MeI has been developed to measure pyridinium-π interactions. This balance adopts two distinct conformers, A and B, which are stabilized by a cation-π interaction and a π-π interaction, respectively. The conformer ratio was determined on the basis of the averaged (3)J coupling constants for H1-C-C-H2 and the corresponding boundary J values for conformers A and B. The effects of the solvent and the counteranion on the ΔG values were investigated using this molecular balance. Thermodynamic parameters obtained from a van't Hoff plot helped us to better understand the solvent and counteranion effects.
authors.affiliation: Department of Chemistry, Faculty of Science, Ochanomizu University , 2-1-1 Otsuka, Bunkyo-ku, Tokyo112-8610, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Yamada
authors.affiliation: Department of Chemistry, Faculty of Science, Ochanomizu University , 2-1-1 Otsuka, Bunkyo-ku, Tokyo112-8610, Japan.
authors.forename: Natsuo
authors.initials: N
authors.lastname: Yamamoto
authors.affiliation: Department of Chemistry, Faculty of Science, Ochanomizu University , 2-1-1 Otsuka, Bunkyo-ku, Tokyo112-8610, Japan.
authors.forename: Eri
authors.initials: E
authors.lastname: Takamori