Effect of Methyl, Hydroxyl, and Chloro Substituents in Position 3 of 3′,4′,7-Trihydroxyflavylium: Stability, Kinetics, and Thermodynamics
作者:Alfonso Alejo-Armijo、Sofía Salido、Joaquín Altarejos、A. Jorge Parola、Sandra Gago、Nuno Basílio、Luis Cabrita、Fernando Pina
DOI:10.1002/chem.201601564
日期:2016.8.22
hydroxyl, and chloride substituents in position 3 of the 3′,4′,7‐trihydroxyflavylium core structure was studied. The stability, relative energy of each of chemical species (thermodynamics), and their rates of interconversion (kinetics) are very dependent on these substituents. By comparing the mole fraction distribution at equilibrium of the three multistate systems with the parent 3′,4′,7‐trihydroxyflavylium
研究了3',4',7-三羟基黄酮核心结构3位上甲基,羟基和氯取代基的影响。每个化学物种的稳定性,相对能量(热力学)及其相互转化率(动力学)都非常依赖于这些取代基。通过比较三个多态系统在平衡状态下与母体3',4',7-三羟基黄酮的摩尔分数分布,在位置3引入甲基取代基增加了半缩酮的摩尔分数,但反式为查尔酮并显着提高水合速率;如在花青素中所观察到的,位置3上的羟基取代基引起降解过程。在3-氯-3',4',7-三羟基黄酮的情况下,观察到黄酮阳离子酸性显着增加,并且在1 m HCl中照射相应的反查尔酮后, 可以操作光致变色系统。根据3,3',4',7-四羟基黄酮和3',4',7-三羟基黄酮的光致变色响应,讨论了对良好的光致变色性能的一些要求。