Issue 6, 2019
From the journal:

Chemical Science

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

Tsukasa Sawato,a   Yasuhiro Shinozaki,a   Nozomi Saitoa  and  Masahiko Yamaguchi ORCID logo *a  

* Corresponding authors

a Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba, Sendai 980-8578, Japan
E-mail: yama@m.tohoku.ac.jp
Fax: +81-22-795-6811

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, Δε 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.

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

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Article information

DOI
https://doi.org/10.1039/C8SC03109F
Article type
Edge Article
Submitted
13 Jul 2018
Accepted
29 Nov 2018
First published
30 Nov 2018
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2019,10, 1735-1740

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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

T. Sawato, Y. Shinozaki, N. Saito and M. Yamaguchi, Chem. Sci., 2019, 10, 1735 DOI: 10.1039/C8SC03109F

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