Development of highly selective chemosensor for chomium(III) estimation in aqueous environment

A Heterocyclic-based Bifunctional Sensor for Detecting Cobalt and Zinc Ion

A new bifunctional chemosensor HBP ((E)-2-(2-((5-bromopyridin-2-yl)methylene)hydrazinyl) quinoline) based on heterocyclic compounds was designed and studied. The HBP showed successful detecting ability toward cobalt ion with a UV-visible red-shift and a color change of colorless to pink. Moreover, toward zinc ion, the HBP showed an obvious fluorescence turn-on response. The binding ratio of the HBP to cobalt and zinc was a 2 to 1 for both ions. The detection limits were found to be 10 nM for Co2+ and 18 nM for Zn2+. Based on UV-vis and fluorescent spectral variations, Job plots, ESI-MS, FT-IR and calculations, the binding mechanisms of the HBP toward cobalt and zinc ions were proposed.

A Schiff base-based fluorescent probe for the quick detection of ClO− ions

A new Schiff base 2-hydroxy-5-[(2,7-dihydroxy-1-naphthyl)methylideneamino]benzoic acid (HNMB) has been designed and synthesized. HNMB was characterized by Fourier-transform infrared spectroscopy (FTIR), electrospray ionization mass spectrometry (ESI–MS), nuclear magnetic resonance spectrometry (NMR), and single crystal X-ray diffraction. Fluorescence spectra show that HNMB could be used as a “turn-on” probe to detect ClO− ions from other anions in DMSO/H2O (v/v = 1:1) with a fast response time of 10 s and a low detection limit of 3.6 × 10−7 mol/L. Moreover, the probe could work in a wide pH range of 4–10. The detection mechanism was studied by ESI–MS.

Synthesis and X-ray characterization of antipyrine-tethered organosilanes and their magnetic nanoparticles: potent anti-oxidants and receptors for Sn(ii) ions

This study focuses on the synthesis and X-ray characterization of antipyrine-tethered organosilanes for their potential applications in the fields of material science, pharmaceuticals and chemosensing.

Preparation of anthracene-based tetraperimidine hexafluorophosphate and selective recognition of chromium(III) ions

A novel anthracene-based tetraperimidine hexafluorophosphate 3 was prepared, and its structure was determined through X-ray analysis, HRMS as well as ¹H and ¹³C NMR spectroscopy. In the cationic moiety of 3, two (N-ethylperimidinyl–C₂H₄)₂NCH₂– arms were attached to the 9- and 10-positions of anthracene. In addition, compound 3 was used as a chemosensor to research the ability to recognize Cr³⁺ through fluorescence and UV titrations, HRMS, as well as ¹H NMR and IR spectroscopy. The results indicate that 3 is an effective chemosensor for Cr³⁺.

A new phthalimide based chemosensor for selective spectrophotometric detection of Cu(II) from aqueous medium

A new phthalimide based chemosensor 2-(Pyridin-2-yl-(pyridine-2-ylimino)methyl)isoindoline-1,3-dione (PP3) was synthesized and characterized by IR, LCMS and NMR spectroscopic methods. The metal ions sensing ability of PP3 was examined by naked-eye and UV-Vis absorption techniques. The colorless solution of PP3 turned to yellow upon addition of Cu²⁺ and a new absorption band appeared at 434 nm. The Job's plot and HR-MS data confirms the formation of a new complex species between PP3 and Cu²⁺ in 1:1 binding stoichiometry. The sensor PP3 allowed the detection of Cu²⁺ down to 1.65 μM without any remarkable interference from the other tested metal cations.