intensity of 1a–1d enhanced by 12–239 fold as the polarity of 1,4-dioxane/H2O mixtures declined. 1a–1d had a large Stokes shift (up to 229 nm) in polar solvents in comparison to nonpolar solvents. The colocalization imaging experiments demonstrated that dyes 1a–1d (3–10 μM) were located in mitochondria, lipid droplets, lysosomes and the endoplasmic reticulum in living HeLa cells, respectively; and they could
利用
1,8-萘啶与4-( N , N-二乙
氨基)
苯甲醛( 2a )、4-( N , N-二苯
氨基)
苯甲醛( 2b )、4-(
哌嗪-1-基)
苯甲醛( 2c )和4-(乙基(4-甲酰基苯基)
氨基)-N- ( 2-((4-甲基苯基)磺酰胺基)乙基)分别为丁酰胺(2d)。
染料1a-1d的最大吸收带在375-447 nm处观察到,而它们的最大发射峰位于495-605 nm处。光学特性表明,随着系统极性 (Δ f ) 的增加,
染料1a–1d的荧光发射向更长的波长移动。同时,随着混合1,4-
二恶烷/H 2 O体系极性的增加,
染料1a-1d的荧光强度逐渐降低。此外,随着 1,4-
二恶烷/H 2 O 混合物极性的下降, 1a-1d的荧光强度增强了 12-239 倍。与非极性溶剂相比, 1a-1d在极性溶剂中具有较大的斯托克斯位移(高达 229 nm)。共定位成像实验表明,
染料1a–1d (3–10 μM) 分别位于活