Naked Eye Chemosensor and In Vivo Chelating Activity of Iron (III) By Bromopyridine Quinoxaline (BPQ)

A wide variety of medical, biomedical, and industrial applications has been reported for quinoxalines derivatives. In this work, a novel quinoxaline derivative was designed and synthesized. Naked-eye and quantitative detection of Fe³⁺ among several cations were evaluated using UV-Vis spectroscopy. New chemosensor, 2,3-bis(6-bromopyridine-2-yl)-6-chloroquinoxaline named BPQ, showed a selective interaction for iron ion over other tested cations by changing color. Iron overloaded mice were prepared as a thalassemia model and then the effects of iron-chelating activities of BPQ were experienced. The job's plot methods determined the stoichiometric ratio of ligand to Fe³⁺ (1:1). The iron content in serum was evaluated by atomic absorption spectroscopy (AAS). Results showed significant differences (two-fold decrease in total iron and Fe³⁺) between the iron overloaded and BPQ (dose of 20 mgkg-1). The BPQ was identified as a ligand, which can be applied as a new chelator for decreasing the excess iron of blood.

A selective thioxothiazolidin-coumarin probe for Hg2+ based on its desulfurization reaction. Exploring its potential for live cell imaging

Sensing the most toxic heavy metal (mercury) has attracted a lot of attention in recent years due to its extreme harmfulness to both human health and the environment. Thus, we reported herein the synthesis, spectroscopic and kinetic characterization, and biological evaluation of a new thioxothiazolidin coumarin derivative (ILA92), which undergoes a desulfurization reaction induced by mercuric ions (Hg²⁺). This process is the origin of a selective sensing of Hg²⁺ ions in aqueous solution by colorimetric and fluorescent methods. Furthermore, the probe showed great potential for imaging Hg²⁺ in living cells.