Indocyanine green (ICG) derivatives having nucleophilic substituents were synthesized as pH-responsive near-infrared dyes. pH-responsive dyes 1-C with closed-ring structures smoothly internalized and converted to emissive open-ring structures 1-O in response to relatively low pHs in acidic intracellular compartments of HeLa cells.
具有亲核取代基的
吲哚菁绿(ICG)衍
生物被合成为pH响应的近红外
染料。具有响应性的闭环结构的pH响应
染料1-C平滑地内在化,并响应HeLa细胞的酸性细胞内区室中相对较低的pH值而转变为发光的开环结构1-O。