Synthesis and Photochromism of Novel Chromene Derivatives Bearing a Monoazacrown Ether Moiety
作者:Saleh A. Ahmed、Mutsuo Tanaka、Hisanori Ando、Hitoshi Iwamoto、Keiichi Kimura
DOI:10.1002/ejoc.200300070
日期:2003.7
isomerization and photoisomerization of the chromene moiety, reflecting the metal-ion-binding ability of the crown ether moiety. Comparison of the crowned chromenes with the corresponding crowned spirobenzopyrans reveals that photochromism of the crowned chromene reflects an interaction between the metal ion and the crown ether moiety that is stronger than that of the crowned spirobenzopyran, and shows only positive
Crowned chromenes - 合成了四种带有单氮杂-12-crown-4、-15-crown-5、-18-crown-6 和 5 位非环状类似物的新型萘并吡喃(色烯),并在乙腈中进行了光致变色在碱金属和碱土金属离子的存在下进行了检测。冠醚单元与色烯部分的结合在很大程度上促进了色烯部分的热异构化和光异构化,反映了冠醚部分的金属离子结合能力。冠色烯与相应冠状螺苯并吡喃的比较表明冠色烯的光致变色反映了金属离子与冠醚部分之间的相互作用,该相互作用比冠状螺苯并吡喃更强,与之前报道的冠状螺苯并吡喃形成对比,仅显示出正光致变色,在 UV/Vis 吸收光谱中有显着的红移。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)