Photochromism of dihydroindolizines part VII: multiaddressable photophysical properties of new photochromic dihydroindolizines bearing substituted benzo[i]phenanthridine as a fluorescing moiety
作者:Saleh Abdel-Mgeed Ahmed
DOI:10.1002/poc.1209
日期:2007.8
to green–blue colored betaines 7a-p after cooling with liquid nitrogen. The kinetics of the fast bleaching process of betaines 7a-p to DHIs 8a-p, studied by flash photolysis as well as low temperature FT-UV/VIS, were found to take place in the millisecond range (432–2675 ms) in dichloromethane solution and fitted well a first-order thermal back reaction. The fluorescence spectra as well as the fluorescence
通过顺-反取代的4-苯乙烯基喹啉的光环化以低至中等的产率制备了十六种苯并[i]菲啶衍生物8a-p。通过光谱和分析工具明确阐明了光环化苯并[i]菲啶衍生物的化学结构。该光致变色(PC)dihydroindolizines(DHIs)8A-P基于苯并[d]是在19-57%的收率通过亲核加成苯并[I]菲啶制备菲啶4A-P到spirocyclopropenes 5。一维,二维,NOESY NMR光谱,质谱和元素分析用于表征新合成的DHI 8a-p的化学结构。已经实现了通过基础部分中的取代基开发和调节合成化合物的光物理性质。最大吸收(λ最大)和半衰期(吨1/2有色两性离子形式的)图7a-P在所有情况下由闪光光解测量检测由于快速1,5- electrocyclization回DHI系统。在CH 2 Cl 2溶液中用多色光照射DHI 8a-p会导致在用液氮冷却后形成绿色到绿色-蓝色的甜菜碱7a-p。从甜菜碱7a-p到DHI