Related Experiment Video
Updated: Mar 27, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
Published on: February 15, 2016
Conformational Transformations of (C12H25NH3(+))(Pyridinesulfonate) in the Solid State
Atsushi Funada1, Shota Uchikawa1, Norihisa Hoshino1,2
1Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
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).
More Related Videos
Related Concept Videos
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
Chair Conformation of Cyclohexane
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
Conformations of Cyclohexane
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR
Structure of Amines

