Two novel photochromic macrocycles 1 and 2 bearing dithienylethene units and urea building blocks have been synthesized, and their photochromic properties are described. Macrocycle 2 shows good photochromic properties...Two novel photochromic macrocycles 1 and 2 bearing dithienylethene units and urea building blocks have been synthesized, and their photochromic properties are described. Macrocycle 2 shows good photochromic properties, while the relatively smaller size of macrocycle 8h exhibits photochemically inactive properties due to the unfa- vourable ring conformational constraint. Moreover, the crystal structures of the urea-protected precursor macrocyles 3a, 3h, and 8b are presented.展开更多
基金the National Natural Science Foundation of China，the Natural Science Foundation of Jiangsu Province
文摘Two novel photochromic macrocycles 1 and 2 bearing dithienylethene units and urea building blocks have been synthesized, and their photochromic properties are described. Macrocycle 2 shows good photochromic properties, while the relatively smaller size of macrocycle 8h exhibits photochemically inactive properties due to the unfa- vourable ring conformational constraint. Moreover, the crystal structures of the urea-protected precursor macrocyles 3a, 3h, and 8b are presented.
