作者:Margarida C. Moncada、Fernando Pina、Ana Roque、A. Jorge Parola、Mauro Maestri、Vincenzo Balzani
DOI:10.1002/ejoc.200300508
日期:2004.1
intricate pH- and light-dependent network of the thermal and photochemical reactions of the 4′-(dimethylamino)-7-hydroxyflavylium ion by continuous irradiation, flash photolysis, 1H NMR spectroscopy, and stopped flow analysis. The distribution of the various forms at the pH-dependent thermodynamic equilibrium and the rates of several interconversion processes were measured. The most interesting feature of
我们通过连续照射、闪光光解、1H NMR 光谱和停流分析研究了 4'-(二甲氨基)-7-羟基黄鎓离子的热和光化学反应的复杂 pH 和光依赖网络。测量了在依赖于 pH 值的热力学平衡下各种形式的分布和几个相互转化过程的速率。这种多态/多功能系统最有趣的特征与调节光辐射引起的颜色变化的 pH 值的可能性有关,因为从反式查尔酮形式的光异构化获得的顺式查尔酮异构体会自发地转化为有色物质(黄花阳离子和醌型碱)在低 pH 值下,但由于顺式和反式查耳酮异构体之间的低能垒,在高 pH 值时会恢复为未着色的反式查耳酮。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)