Bis-Rhodamines Bridged with a Diazoketone Linker: Synthesis, Structure, and Photolysis
作者:Heydar Shojaei、Mariano L. Bossi、Vladimir N. Belov、Stefan W. Hell
DOI:10.1021/acs.joc.1c01721
日期:2022.1.7
Two fluorophores bound with a short photoreactive bridge are fascinating structures and remained unexplored. To investigate the synthesis and photolysis of such dyes, we linked two rhodamine dyes via a diazoketone bridge (−COCN2−) attached to position 5′ or 6′ of the pendant phenyl rings. For that, the mixture of 5′- or 6′-bromo derivatives of the parent dye was prepared, transformed into 1,2-diarylacetylenes
与短光反应桥结合的两个荧光团是迷人的结构,仍未被探索。为了研究此类染料的合成和光解,我们通过连接到侧苯环 5' 或 6' 位的重氮酮桥 (-COCN 2 -) 连接两种罗丹明染料。为此,制备母体染料的5'-或6'-溴衍生物的混合物,转化为1,2-二芳基乙炔,水合为1,2-二芳基乙酮,并转化为重氮酮Ar 1 COCN 2 Ar 2。高效液相色谱 (HPLC) 分离得到 Ar 1 COCN 2 Ar 2的四种单独的区域异构体。模型化合物的光解─C 6 H5 COCN 2 C 6 H 5 ─在乙腈水溶液中,pH 7.3,在 365 nm 光照射下得到二苯乙酸酰胺(Wolff 重排)。然而,在相同条件下,Ar 1 COCN 2 Ar 2主要产生α-二酮Ar 1 COCOAr 2。非常大的染料残留物的迁移能力低,并且没有发生沃尔夫重排。我们仅观察到中度荧光增加,这可能是由于重氮酮桥 (-COCN 2