Rhodamine-based chemosensor for Hg2+ in aqueous solution with a broad pH range and its application in live cell imaging
作者:Yun Zhao、Yue Sun、Xin Lv、Yunlong Liu、Maliang Chen、Wei Guo
DOI:10.1039/c0ob00013b
日期:——
A new fluorescent probe, rhodamine B derivative (1) bearing an 8-hydroxyquinoline group, was synthesized and displayed highly selective and sensitive Hg2+-amplified absorbance and fluorescence emission above 500 nm in aqueous solution with a broad pH range 4–9. It was found that mercury ions coordinate reversibly to 1 and the spirolactam ring of 1 was opened, forming a 1 : 1 metal–ligand complex. Furthermore, this sensor was applied for in vivo imaging in HeLa cells to confirm that 1 can be used as a fluorescent probe for monitoring Hg2+ in living cells.
合成了一种新型荧光探针——罗丹明B衍生物(1),该衍生物含有一个8-羟基喹啉基团,在广泛的pH值范围(4-9)内水溶液中表现出对Hg2+的高度选择性和灵敏度,其吸收峰和荧光发射峰均在500 nm以上。研究发现,汞离子可逆地与1结合,并打开1的螺内酰胺环,形成1:1的金属配体配合物。此外,该传感器应用于HeLa细胞的活体成像,证实了1可用作监测活细胞中Hg2+的荧光探针。