1. Ratiometric detection of I− using a dysprosium-based metal–organic framework with a single emission center.
- Author
-
Guo, Qing-Zhong, Yi, Feng-Ying, Zhang, Meng-Yao, Guo, Jun-Fang, and Luo, Fa-Liang
- Subjects
- *
METAL-organic frameworks , *DETECTION limit , *IODIDES - Abstract
In this study, a dysprosium-based metal–organic framework (MOF) sensor (Dy-MOF) was developed for the ratiometric detection of I− in aqueous medium. Upon excitation at 230 nm, Dy-MOF shows two dominant emission bands at 464 nm and 574 nm assigned to (4F, 4D)5/2 → 6H9/2 + 6F11/2 and 4F9/2 → 6H13/2 transition of Dy3+, respectively, which have different sensitivities toward iodide ions. The introduction of I− slightly weakened the blue emission at 464 nm and significantly quenched the yellow emission at 574 nm. Thus, ratiometric sensing for iodide was realized using the yellow-to-blue intensity ratio of Dy3+. Dy-MOF exhibits superior sensing behavior towards I− with high selectivity, sensitivity and low detection limit (24 nM). This study also provides a strategy for the construction of a ratiometric sensor with dual-emission bands originating from only one emission center. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF