A new reversible aldehyde-appended salamo-like fluorogenic probe for cascade sensing of Ni2+ and HPO42- ions in aqueous medium

A reversible salamo-like probe (H2L) and its nickel(II) complex which could be fully characterized by various physicochemical and spectroscopic techniques. Furthermore, the solid-state crystal structure of the nickel(II) complex along with detailed structural analysis using single crystal X-ray crystallography. The developed probe could be used as an efficient fluorogenic probe to detect Ni2+ ion in aqueous medium. Subsequently, the in situ generated complex exhibited a high sensitivity and selectivity to HPO42- ion with detection limit of 3.42 x 10(-8) M. The sensing mechanism of H2L towards Ni2+ ion and sequential detection towards HPO42- ion are well studied by UV-Vis and ESI mass methods. The practical applicability values of this probe have been examined by test paper and reversible cycle.

Automated summary

This article presents a reversible fluorescence probe H2L and its nickel(II) complex for the detection of Ni2+ and HPO42- ions in aqueous medium. The probe shows high sensitivity and selectivity, and its structure has been characterized by various techniques.