The invention pertains to a near-infrared fluorescent dye that is cell permeable and can be attached to selected proteins in living cells. The dye has the general formula (I) or its or its corresponding spirolactone (II) wherein Y is chosen from the group consisting of Si, Ge and Sn; R0 is -COO- or COOH; R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15 and R16 are substituents, including hydrogen, independently from each other. The dye (i) absorbs and emits light at wavelengths above 600 nm; (ii) possesses high photostability; (iii) has high extinction coefficients and high quantum yields; (iv) can be derivatized with different molecules; and (v) is membrane-permeable and shows mini¬ mal background binding to biomolecules and biomolecular structures.
该发明涉及一种近红外荧光
染料,可以穿透细胞并附着于活细胞中的特定蛋白质。该
染料具有一般式(I)或其相应的
螺内酯(II),其中Y选择自Si、Ge和Sn组成的群;R0为-COO-或COOH;R1、R2、R3、R4、R5、R6、R7、R8、R9、R10、R11、R12、R13、R14、R15和R16为取代基,包括独立于彼此的氢。该
染料(i)在600纳米以上的波长吸收和发射光;(ii)具有高光稳定性;(iii)具有高消光系数和高量子产率;(iv)可以与不同分子衍生化;(v)具有膜通透性,并显示对
生物分子和
生物分子结构的最小背景结合。