A simple strategy to overcome concentration dependence of photoswitching properties in donor–acceptor Stenhouse adducts,Physical Chemistry Chemical Physics

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A simple strategy to overcome concentration dependence of photoswitching properties in donor–acceptor Stenhouse adducts
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2021-1-13 , DOI: 10.1039/d0cp06312f
Sean W. Connolly _{1,

2,

3,

4} , Rahul Tiwari _{1,

2,

3,

4,

5} , Simon J. Holder _{1,

2,

3,

4} , Helena J. Shepherd _{1,

2,

3,

4}

Affiliation

Photoswitchable donor–acceptor Stenhouse adducts (DASAs) have been reported to exhibit an undesirable concentration dependence, where photoswitching is greatly inhibited with increasing photochrome concentration. Here we show that the use of piperazine-based donor moieties eliminates this concentration dependence and results in complete, rapid and reversible photoswitching behaviour for first generation DASAs, even in chlorinated solvents. Structural data and computational studies reveal proton transfer during isomerisation to the terminal amine rather than the donor amine. The improvement in photoswitching efficiency is attributed to resultant differences in supramolecular association.

中文翻译：

一种克服供体-受体Stenhouse加合物中光开关性质对浓度依赖性的简单策略

据报道，可光转换的供体-受体Stenhouse加合物（DASAs）表现出不良的浓度依赖性，其中随着光铬浓度的增加，光转换受到极大的抑制。在这里，我们表明使用基于哌嗪的供体部分消除了这种浓度依赖性，即使在氯化溶剂中，也能为第一代DASA带来完全，快速和可逆的光开关性能。结构数据和计算研究表明，在异构化过程中质子转移至末端胺而不是供体胺。光开关效率的提高归因于超分子缔合的结果差异。

更新日期：2021-01-25

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