Modulation of Spectrokinetic Properties of<i>o</i>-Quinonoid Reactive Intermediates by Electronic Factors: Time-Resolved Laser Flash and Steady-State Photolysis Investigations of Photochromic 6- and 7-Arylchromenes
作者:Jarugu Narasimha Moorthy、Apurba L. Koner、Subhas Samanta、Ankur Roy、Werner M. Nau
DOI:10.1002/chem.200801925
日期:2009.4.20
cleavage to yield colored o‐quinonoid intermediates. A combined analysis of μs–ms (laser flash) and real‐time kinetic data show that the o‐quinonoid intermediates decay faster when the C2‐aryl and C6‐/C7‐aryl rings contain electron‐donating and electron‐accepting groups, respectively. Similarly, the decay occurs slowly for the reversed scenario, while intermediate decay rates are observed when both substituents
多种的不同取代的6-和7- arylchromenes如所描绘离岗光敏反应Ç O键裂解以产生有色ö -quinonoid中间体。对μs–ms(激光闪光)和实时动力学数据的综合分析表明,当C2-芳基和C6- / C7-芳基环分别包含给电子基团和电子接受基团时,邻醌类中间体的衰减更快。类似地,在相反的情况下,衰变缓慢发生,而当两个取代基都是给电子体时,观察到中等的衰变速率。