Chemical CD oscillation and chemical resonance phenomena in a competitive self-catalytic reaction system: a single temperature oscillation induces CD oscillations twice. Issue 6 (6th December 2018)

• Record Type: Journal Article
• Authors: Sawato, Tsukasa; Shinozaki, Yasuhiro; Saito, Nozomi; Yamaguchi, Masahiko
• Is Part Of: Chemical science. Volume 10:Issue 6(2019)
• Page Start: 1735
• Page End: 1740
• Publication Date: 2018-12-06
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8sc03109f
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Chemical CD oscillation and chemical resonance phenomena appear in a competitive chemical reaction system involving amplification. Abstract : Chemical CD oscillation and chemical resonance phenomena appear in a competitive chemical reaction system involving amplification. A pseudoenantiomeric mixture of an aminomethylenehelicene ( P )-tetramer and an ( M )-hexamer in toluene forms three states, namely hetero-double-helixB, hetero-double-helixC, and dissociated random-coil 2A . When the temperature of the solution is oscillated between −5 and 38 °C at a rate of 2 K min −1, Δ ε reaches maxima twice during a single temperature oscillation, which is called a chemical CD oscillation phenomenon. The phenomenon arises from the sharp competition between the two self-catalytic 2A +C -to-2C and 2A +B -to-2B reactions. In addition, the chemical CD oscillation appears, when temperature oscillation occurs at a rate of 2 K min −1, and higher and lower rates provide a single maximum, a process referred to as the chemical resonance phenomenon. The changes in concentration induced by temperature oscillation repeatedly crossed equilibrium.