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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >4'-Carboxy-7-hydroxyflavylium. A Multistate System Involving Twelve Species Reversibly Interconverted by pH and Light Stimuli
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4'-Carboxy-7-hydroxyflavylium. A Multistate System Involving Twelve Species Reversibly Interconverted by pH and Light Stimuli

机译：4'-羧基-7-羟基黄酮。 pH和光刺激可逆地相互转换的涉及十二种物种的多态系统

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摘要

In the frame of the metamorphosis chemistry, where complexity is achieved at the bottom, a multistate system based on 4'-carboxy-7-hydroxyflavylium is described. Twelve species reversibly interconverted by pH and light stimuli were identified at the equilibrium or as transients. The carboxylic substituent deprotonates at moderately acidic pH values and as a consequence allows the existence of two photoactive transchalcones, whose irradiation leads to different photoproducts. The thermodynamic and kinetic properties of the network of reactions of the multistate system were investigated by means of UV-vis spectroscopy, stopped-flow, continuous irradiation, and flash photolysis. The evolution of the system to the equilibrium when the pH is raised from acidic to higher pH values can take place through two different routes involving the protonated or the deprotonated species at the carboxylic acid substituent. The kinetics and the photochromism of the system were rationalized by means of an energy level diagram.
机译：在变态化学的框架中，在底部实现了复杂性，描述了一种基于4'-羧基-7-羟基黄酮的多态系统。在平衡状态或瞬态状态下，鉴定了12种通过pH和光刺激可逆地相互转换的物种。羧基取代基在中等酸性pH值下会去质子化，因此允许存在两个光敏跨查耳酮，它们的照射会导致产生不同的光产物。通过紫外-可见光谱，停止流，连续辐射和快速光解研究了多态系统反应网络的热力学和动力学性质。当pH值从酸性升高到较高的pH值时，系统向平衡的演化可以通过两种不同的途径进行，涉及在羧酸取代基处的质子化或去质子化物质。该系统的动力学和光致变色现象通过能级图得到了合理化。

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