Nonequilibrium-to-equilibrium chemical reactions, involving change of a metastable to an equilibrium state, are discussed from the aspects of reaction paths and thermodynamics. Such reaction exhibits multiple-paths nature in microscopic molecular structural changes and in macroscopic molecular concentration changes. Involvement of reversibility largely enhances the multiple-paths nature. We describe here our recent studies on the reversible nonequilibrium molecular switching system of sulfonamidohelicene oligomer in diluted solution, which involves the reversible nonequilibrium-to-equilibrium chemical reactions. Molecular structural changes from metastable random-coil to helix-dimer under equilibrium with self-catalysis show notable chemical phenomena of molecular thermal hysteresis, molecular memory effect, threshold phenomena, counting the numbers 1 and 2, and concentration amplification.
|Number of pages
|Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry
|Published - 2017
- Molecular switching
- Molecular thermal hysteresis