A new heteroditopic chemosensor based on the 1,3-alternate conformation of thiacalix[4]crown shows a ratiometric fluorescence response towards Hg(2+) ions. Further, a negative allosteric behaviour between Hg(2+)/Li(+) ions is observed. Thus, metal ion exchange triggers a Hg(2+)/Li(+) switchable fluorescent chemosensor.

A fiber optic sensor for monitoring mercuric (Hg2+) ions in the aqueous sample have been developed based on modified cladding. To fabricate a D-shaped sensing zone onto multimode optical lengthwise polishing was utilized using mechanical end and edge system. The produced region has dimensions of 10 mm × 125 μm 62 (l w h). 2 thin layer Al2O3 nanoparticles sensitized with 4-(2-pyridylazo)-resorci...

The presence of heavy metals released from industrial activities into water streams is an ever-growing challenge to ensuring a safe and clean aquatic environment. Detection and determination of the levels of these heavy metals in wastewater is an important step before any measures can be taken. In this study we report on a fluorescent sensing probe based on a naphthyl azo dye modified dibenzo-1...

We present a one-step, solid-state synthesis of Al2NiCoO5 nanoflakes (ANC) modified glassy carbon electrode (GCE) for ultra-selective and trace level simultaneous detection HMIs like copper (Cu2+), mercury (Hg2+), cadmium (Cd2+), lead (Pb2+) ions in aqua simulated blood serum samples. ANC/GCE sensor exhibits low limit (LOD = 3S/m) 0.00154 ppb, 0.00232 0.00261 ppb 0.00114 towards Pb2+, Hg2+ Cu2+...

The purpose of this work was to synthesize and characterize the thiatetraaza macrocycle 1-thia-4,7,10,13-tetraazacyclopentadecane ([15]aneN4S). Its acid-base behaviour was studied by potentiometry at 25 °C and ionic strength 0.10 M in KNO3. The protonation sequence of this ligand was investigated by 1H-NMR titration that also allowed the determination of protonation constants in D2O. Binding st...

A new procedure is described for the determination of Hg2+ ions in water samples. Rhodamine based fluorescent sensor was synthesized and experimental conditions were specifically optimized application to environmental samples, which requires low detection limits high selectivity competitive experiments with realistic concentrations other metal ions. Incorporation a Rhodamine-6G fluorophore prev...

Uranium is one of the most common radioactive contaminants in the environment. As a major nuclear material in production, environmental samples (like soil and groundwater) can provide signatures on uranium production activity inside the facility. Thus, developing a new and portable analytical technology for uranium in aqueous media is significant not only for environmental monitoring, but also ...

Two sensors, 1 with a spirolactone group and 2 with a spirolactam group containing a phenyl isothiocyanate moiety, based on rhodol, were designed and synthesized in order to obtain materials with excellent optical properties for the detection of environmentally and biologically important Hg2+ and hypochlorous acid (HClO) ions. The crystal structure of 1 revealed two moieties, a rhodamine-like p...

The influence of the thiols L-cysteine (CYS), glutathione (GSH), and 2,3-dimercapto-1-propanesulfonate (DMPS) on the binding and transport of inorganic mercury (Hg2+) in luminal (brush-border) and basolateral membrane-vesicles isolated from the kidneys of rats was studied using radiolabeled mercury (203HgCl2). Membrane-vesicles were exposed to 1, 10, or 100 microM Hg2+ in the presence or absenc...

We here report a rapid, sensitive, selective and label-free fluorescence detection method for cysteine (Cys). The conformation of mercury-specific DNA (MSD) changes from a random coil form to a hairpin structure in the presence of Hg2+ due to the formation of a thymine-Hg2+ -thymine (T-Hg2+ -T) complex. Cys can selectively coordinate with Hg2+ and extract it from the thymine-Hg2+ -thymine compl...