Water-soluble and highly emissive near-infrared nano-probes by co-assembly of ionic amphiphiles: towards application in cell imaging
作者:Yuzhi Xing、Dahua Li、Bin Dong、Xiaocheng Wang、Chengfeng Wu、Lan Ding、Shixin Zhou、Jian Fan、Bo Song
DOI:10.1039/c9nj01184f
日期:——
fluorescent dye (denoted by PBI-TPE-11), a bolaamphiphile bearing conjugated tetraphenylethylene and perylene bisimide in the middle and two aliphatic pyridinium groups at both ends. PBI-TPE-11 self-assembled into flake-like nanostructures in aqueous solution and showed very weak fluorescence emission from 600 to 830 nm, covering the NIR region. This result seems discrepant with that previously reported
水溶性近红外(NIR)荧光染料在细胞成像中非常有价值。我们在此设计并合成了一种两亲性荧光染料(用PBI-TPE-11表示),一种在两末端带有共轭四苯基乙烯和per双酰亚胺的共生两亲性双末端荧光团。PBI-TPE-11在水溶液中自组装成片状纳米结构,并在600至830 nm范围内显示非常弱的荧光发射,覆盖了NIR区域。该结果似乎与先前文献中报道的结果相矛盾,在文献中,PBI和TPE的结合被证明增强了聚集诱导的发射。非常有趣的是,十二烷基苯磺酸钠(SDBS)的加入改变了形态和发射强度。通过使用原子力显微镜观察,PBI-TPE-11和SDBS的共同组装形成了纳米线。而且,共同组件的发射比纯净的PBI-TPE-11的组件的发射要强得多。配合件获得了令人兴奋的量子产率(QY),为15%,而纯PBI-TPE-11的QY仅为0.2%。最后,该组件成功应用于标记HeLa细胞,并获得了高活力和高对比度的荧光图像。