A Fluorescent Turn-On Sensor Toward Multiple Heavy Metal Ions Based on Meso-anisole Modified BODIPY Scaffold
作者:Xiaochuan Li、Fangfang Li、Guangqian Ji
DOI:10.1007/s10895-022-03110-1
日期:2023.3
A fluorescent turn-on sensor (BOPA) was configured by anchoring bis(pyridin-2-ylmethyl)-amine (DPA) unit to the BODIPY scaffold. It exhibits highly sensitivity and selectivity towards Pb2+, Ba2+, Cr3+, Cd2+, Hg2+, Zn2+ against the competent metal ions. Job’s plot analysis supports the 1:1 stoichiometry of BOPA and metal ions. And linear relationship between fluorescence intensity and concentration of Zn2+ (representative metal ion) was observed over the range 0 ~ 20 μM Zn2+. The limit detection of BOPA in recognition of Pb2+, Ba2+, Cr3+, Cd2+, Hg2+, Zn2+ was ranged from 15.99 to 43.57 nM. Photo induced transfer (PET) in the excited state of BOPA determines the emission “off/on”. Coordination of metal ions by DPA significantly weakened the electron-donating ability of nitrogen atom and inhibits the PET, recovering emission of BODIPY. In addition, the attachment of anisole at meso-position of BODIPY finely modulated the recognition of metal ions category.
荧光开启传感器(BOPA)通过将双(吡啶-2-基甲基)胺(DPA)单元锚定到BODIPY支架上来配置。它对Pb2+、Ba2+、Cr3+、Cd2+、Hg2+、Zn2+等有效金属离子表现出高度的敏感性和选择性。工作图分析支持BOPA和金属离子之间的1:1化学计量比。在0~20 μM Zn2+的范围内,观察到荧光强度与Zn2+(代表性金属离子)浓度之间的线性关系。BOPA识别Pb2+、Ba2+、Cr3+、Cd2+、Hg2+、Zn2+的极限检测范围为15.99~43.57 nM。BOPA激发态中的光诱导转移(PET)决定了发射“关闭/开启”。DPA对金属离子的配位显著削弱了氮原子的电子给体能力,抑制了PET,恢复了BODIPY的发射。此外,BODIPY中位点上的苯甲醚的附着可以精细调节对金属离子类别的识别。