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


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-helix B, hetero-double-helix C, 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, ?? 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.

SUBMITTER: Sawato T 

PROVIDER: S-EPMC6368240 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

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

Sawato Tsukasa T   Shinozaki Yasuhiro Y   Saito Nozomi N   Yamaguchi Masahiko M  

Chemical science 20181130 6


Chemical CD oscillation and chemical resonance phenomena appear in a competitive chemical reaction system involving amplification. A pseudoenantiomeric mixture of an aminomethylenehelicene (<i>P</i>)-tetramer and an (<i>M</i>)-hexamer in toluene forms three states, namely hetero-double-helix <b>B</b>, hetero-double-helix <b>C</b>, and dissociated random-coil 2<b>A</b>. When the temperature of the solution is oscillated between -5 and 38 °C at a rate of 2 K min<sup>-1</sup>, Δ<i>ε</i> reaches max  ...[more]

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