Chemical CD oscillation and chemical resonance phenomena in a competitive self-catalytic reaction system: a single temperature oscillation induces CD oscillations twice
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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DOI：
10.1039/c8sc03109f
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发表时间：
2019-02-14
期刊：
影响因子：
8.4
通讯作者：
Yamaguchi, Masahiko
中科院分区：
文献类型：
--
作者：
Sawato, Tsukasa;Shinozaki, Yasuhiro;Yamaguchi, Masahiko
在含有放大效应的竞争化学反应体系中，会出现化学CD振荡和化学共振现象。氨基亚甲基螺烯（P）-四聚体和（M）-六聚体在甲苯中的假对映体混合物形成三种状态，即异源双螺旋B、异源双螺旋C和解离的无规卷曲2A。当溶液的温度以2 K min（-1）的速率在-5至38 ℃之间振荡时，在单个温度振荡期间Δ λ达到最大值两次，这被称为化学CD振荡现象。这一现象是由2A + C-to-2C和2A + B-to-2B两个自催化反应之间的激烈竞争引起的。此外，当温度振荡以2K min（-1）的速率发生时，出现化学CD振荡，并且更高和更低的速率提供单个最大值，该过程被称为化学共振现象。由温度振荡引起的浓度变化反复越过平衡。
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, heterodouble-helix C, and dissociated random-coil 2A. When the temperature of the solution is oscillated between -5 and 38 degrees C at a rate of 2 K min(-1), Delta epsilon 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.