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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