Synthesis and Photochromism of Crowned Spirobenzothiapyran: Facilitated Photoisomerization by Cooperative Complexation of Crown Ether and Thiophenolate Moieties with Metal Ions
作者:Mutsuo Tanaka、Kenji Kamada、Hisanori Ando、Takashi Kitagaki、Yasuhiko Shibutani、Keiichi Kimura
DOI:10.1021/jo000175r
日期:2000.7.1
oligooxyethylene moieties were synthesized, and their photochromism was examined in the presence of cations in acetonitrile. The cation complexation by their crown ether moieties cannot induce thermal isomerization to their corresponding colored merocyanine form, unlike the corresponding spirobenzopyran derivatives. The UV-light-induced isomerization was, however, facilitated by the cation complexation
合成了带有单氮杂-12-冠-4,-15-冠-5,-18-冠-6和低聚氧乙烯部分的螺并苯并噻喃,并在乙腈中存在阳离子的情况下检查了它们的光致变色。与相应的螺并苯并吡喃衍生物不同,通过它们的冠醚部分进行的阳离子络合不能诱导热异构化为其相应的有色花菁形式。然而,冠醚部分的阳离子络合以及花青硫酚盐阴离子对金属离子的亲和力,尤其是在Li(+)和Ag(+)的存在下,促进了紫外线诱导的异构化。