A multichromophoric glucopyranoside 2 bearing three dicyanomethylenepyran (DCM) fluorophores and one diarylethene (DAE) photochrome has been prepared by Cu(I)-catalyzed alkyne–azide cycloaddition reaction. The fluorescence of 2 was switched off upon UV irradiation, in proportion with the open to closed form (OF to CF) conversion extent of the DAE moiety. A nearly 100% Förster-type resonance energy transfer (FRET) from all three DCM moieties to a single DAE (in its CF) moiety was achieved. Upon visible irradiation, the initial fluorescence intensity was recovered. The observed photoswiching is reversible, with excellent photo resistance.
一种多色团基
葡萄糖苷2,带有三个二
氰甲亚甲基
吡喃(DCM)荧光团和一个二芳基
乙烯(
DAE)光致变色团,通过Cu(I)-催化的炔炉-
叠氮环加成反应制备。2的荧光在紫外照射下关闭,与
DAE基团的开放到闭合形式(OF到CF)转化程度成比例。实现了从所有三个DCM基团到单个
DAE(在其CF形式下)基团的近100% Förster型谐振能量转移(FRET)。在可见光照射下,初始荧光强度得以恢复。观察到的光开关效应是可逆的,具有出色的光稳定性。