Zinc(ii) Schiff base complexes as dual probes for the detection of NH₄⁺ and HPO₄²⁻ ions

Abstract

Three novel Zn(ii) Schiff base complexes were obtained by solvent evaporation technique. 1 and 2 show selectively recognition of NH4+ and HPO42− accompanied with an efficient fluorescence “turn off” phenomenon.

Multifunctional Lanthanide Metal–Organic Frameworks Are Used for Fluorescence Sensing of Bi3+, HPO42–, Flu, and PNBA and Application

“…And it conforms to the Stern–Volmer ( I 0 / I = 1 + K SV [M]) equation when the HPO 4 2– concentration was in the range of 20.0 to 55.0 μM, where I 0 was the initial luminescence intensity, I was the luminescence intensity after the addition of HPO 4 2– , [M] was the concentration of HPO 4 2– , and K SV was the Stern–Volmer constant. The linear relationship was y = −12655.1836 x – 0.0630, R 2 = 0.9934, and the detection limit was 7.8 × 10 –8 M (Figure a), which was lower than what has been reported in the literature. − In the anti-interference experiment, we found that the presence of other anions did not affect the response of complex 1 to HPO 4 2– (Figure b). In addition, we conducted cyclic testing on complex 1 and found that its fluorescence intensity could be restored after four cycles after repeated washing (Figure S8c).…”

Schiff Base-Modified Nanomaterials for Ion Detection: A Review

“…Another type of tridentate Schiff base has been designed by salicylaldehyde derivatives with various amino-acids in our group. The synthesis route has been indicated in Scheme . The advantages of this type ligand are facile synthesis and “green” components, which are really environmental-friendly Schiff base suitable for applications in many fields.…”

“…The synthesis route has been indicated in Scheme 1. 40 The advantages of this type ligand are facile synthesis and "green" components, which are really environmental-friendly Schiff base suitable for applications in many fields. Their coordination complexes could be easy to construct and to tune their structures through the changes of synthesis conditions.…”

“…Schiff bases and their complexes are widely used in research fields such as catalysis, biological activity, analytical chemistry, and fluorescent functional materials. − We are interested in design and synthesis of tridentate and tetradentate Schiff bases. Their transition metal coordination complexes with fluorescent properties toward probes have been investigated. − It is noteworthy that the first example of fluorescent probe of MOF has been reported by our Lab., which can detect the small organic molecules and water molecule selectively . We have been designed and synthesized several types of Schiff base ligands including tridentate acylhydrazone and tetradentate salen/salphen Schiff base ligands.…”