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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-helix B , hetero-double-helix C , and dissociated random-coil 2 A . 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 2 A + C -to-2 C and 2 A + B -to-2 B 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.

chemical science

Chemical CD oscillation and chemical resonance phenomena in a competitive self-catalytic reaction system: a single temperature oscillation induces CD oscillations twice