Resonance light scattering detection of uranium based on its reaction with a Schiff base containing tetradentate ligand and phosphate groups to form supramolecular polymer

Abstract

To develop a new resonance light scattering (RLS) method for uranium(VI) detection, we have studied the reaction of uranyl with N,N 0 -bis(pyridoxal phosphate)-o-phenylenediamine (BPPP) that is a Schiff base containing a tetradentate ligand and two phosphate groups. BPPP can chelate uranyl and then self-assemble to form a supramolecular polymer, resulting in a production of strong RLS signal. The RLS method was established based on this fact. The linear range is 0.5-25 ng mL -1 with a detection limit of 0.2 ng mL -1 . The method is simple and has been successfully applied to determine uranium(VI) in environmental water samples.

A highly selective pyridoxal-based chemosensor for the detection of Zn(ii) and application in live-cell imaging; X-ray crystallography of pyridoxal-TRIS Schiff-base Zn(ii) and Cu(ii) complexes

“…[49][50][51] However, only a few reports show pyridoxal-based Schiff-bases act as uorometric or colorimetric chemosensors for the detection of transition metals, biomolecules, and anions. 31,[52][53][54][55][56][57][58][59][60][61][62][63][64] In this report, we explore a pyridoxal-based, Zn(II) selective uorescent probe combined with TRIS that exhibits, ease of synthesis, cost efficiency, chemical and photostability, uorescence selectivity and sensitivity, and fast response time for spectral imaging of live-cells (Scheme 1). The coordination environment for Zn(II) ion complexation is clearly delimited by stoichiometric studies and X-ray crystallography, and the TRIS functionality of the Schiff-base provides alternate hydroxyl binding sites for competing metal cations that are more oxophilic than Zn(II), yielding exceptional selectivity and sensitivity.…”