Nitrogen-contained Nanoporous Hyper-cross-linked Polymer: A New Turn-on Fluorescence Probe for Detection of Ag + Ions in Aqueous Media.

A fluorescence probe was designed using a nitrogen-contained mesoporous hyper-cross-linked polymer precursor (NH ₂ -HCP) in order to selectively detect silver (Ag ⁺ ) ions. NH ₂ -HCP exhibits fluorescence intensity, but upon the addition of Ag ⁺ , a significant enhancement in fluorescence signal is observed. The relationship between fluorescence intensity enhancement and Ag ⁺ concentration shows a linear and monotonic trend. The probe's response to various other cations such as Al ³⁺ , Fe ³⁺ , Cd ²⁺ , Ni ²⁺ , Cu ²⁺ , Fe ²⁺ , Hg ²⁺ , Mg ²⁺ , Zn ²⁺ , Pb ²⁺ , Mn ²⁺ , Co ²⁺ , Ca ²⁺ , Na ⁺ , and K ⁺ , as well as halogen anions like F ^- , Cl ^- _, Br ^- , and I ^- was also investigated. Under optimal conditions, the probe demonstrated a linear range of 0.1-3 μM and a detection limit of 0.01 μM.
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