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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Supercritical Fluid Tuning of Reactions Rates: the Cis-Trans Isomerization of 4-4′-Disubstituted Azobenzenes
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Supercritical Fluid Tuning of Reactions Rates: the Cis-Trans Isomerization of 4-4′-Disubstituted Azobenzenes

机译：反应速率的超临界流体调节：4-4'-双取代的偶氮苯的顺反异构化

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摘要

Remarkable tuning of reaction rates has been achieved for the isomerization of several dye molecules in supercritical fluid solvents using both small pressure changes and small additions of cosolvents. Rates of the thermal cis-trans relaxation were measured spectroscopically following irradiation for three dyes in supercritical carbon dioxide and ethane, pure and with several polar and protic cosolvents. The results are explained in terms of local density and composition enhancements, as well as by a change of mechanism due to strong hydrogen bonding. This study demonstrates the versatility of supercritical fluid solvents both to examine reaction mechanisms and as a means to tune rates.
机译：对于超临界流体溶剂中的几种染料分子的异构化，使用较小的压力变化和少量的助溶剂添加，即可实现显着的反应速率调节。在三种染料在超临界二氧化碳和乙烷中，纯净的以及几种极性和质子助溶剂的照射下，通过光谱法测量了顺式-反式热弛豫的速率。用局部密度和组成增强以及由于强氢键引起的机理变化来解释结果。这项研究证明了超临界流体溶剂的多功能性，既可用于检查反应机理，又可作为调节速率的手段。

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