A hybrid mesoporous material functionalized by 1,8-naphthalimide-base receptor and the application as chemosensor and absorbent for Hg2+ in water.

https://www.kau.edu.sa/Files/130/Researches/60281_31089.pdf

Part 1. Spectrophotometric determination of trace mercury (II) in dental-unit wastewater and fertilizer samples using the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one and the dual-wavelength β-correction spectrophotometry

We have synthesized a new fluorogenic compound L, which can selectively bind and sense Hg2+ in aqueous medium over a broad pH range. It exhibits excellent selectivity for Hg2+ over a large number of competitive cations (Fe3+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Ag+, Cd2+, Pb2+, Ca2+, Mg2+, Na+, K+). The sensing ability of the ligand is studied by fluorescence and UV-vis spectroscopy. Hg2+ present even in a nanomolar range can be detected. The effectiveness of L for detecting Hg2+ inside live human cancer cells (HeLa) is also examined. The hydrophobic part of L is efficiently employed for the quantitative extraction of Hg2+ from an aqueous medium into the organic layer. The extraction ability of L is also estimated by NMR, fluorescence and atomic absorption spectroscopy showing that approximately 99% of the Hg2+ ions are extracted. These results imply that the compound has potential application for sensing and removal of Hg2+ ions from waste water in a large cross-section of mercury threatened zones around the world.

Selective sensing and efficient separation of Hg2+ from aqueous medium with a pyrene based amphiphilic ligand

The reactivity of di-iodine towards thiourea (TU) and its derivative methylthiourea (MeTU) was studied. A diversity of products was obtained from these reactions. TU reacted with di-iodine in the absence or presence of hydroiodic or hydrochloric acids in a 1 : 1, 1 : 1 : 1 or 1 : 1 : 2 (TU : I2 : HX (X = I, Cl)) molar ratio to form the ionic compounds [(TU2)2+2(I−)·H2O] (1), [2(TU2) 2+·(Cl−)·2(I−)·(I3−)] (2) and [(TUH)+ (I3−)] (3). The compounds [(TU2)2+(Br−)(I3−)] (4) and [(TU2)2+2(Br−)·H2O] (5) were derived from the reactions of TU with di-iodine in the presence of hydrobromic acid in a 1 : 1 : 1 or 1 : 2 : 1 (TU : I2 : HBr) molar ratio. However, when the product of the reaction between TU and di-iodine in a 2 : 1 (TU : I2) molar ratio was crystallized in acetone–ethylether media the ionic salt of formula [(DAThdH+)(I−)] (6) (DAThd = 3,5-diamino-1,2,4-thiadiazole) was obtained. Methylthiourea (MeTU) reacted with di-iodine in the presence of hydrobromic acid (1 : 1 : 1, MeTU : I2 : HBr) in dichloromethane to form a solid product which gives [2(MeTU2) 2+·(2Br−)(I42−)] (7). Moreover, MeTU reacted with I2 in 2 : 1 (MeTU : I2) to form an intermediate powder product which was crystallized in acetone to give the 2-amino-3,4-dimethylthiazolium cation in [(DMeAThH+)(I−)(H2O)] (8). Upon changing the crystallization medium to ethanol, instead of acetone, the cationic 5-amino-3-methylamino-4-methyl-1,2,4-thiadiazolium (AMeAThdH)+ in [(AMeAThdH+)(I3−)] (9) was formed. The compounds were characterized by m.p., FT-IR, UV-Vis, 1H-NMR spectroscopy and mass spectrometry. The crystal structures of compounds 1–9 were determined by X-ray crystallography.

https://pubs.rsc.org/en/content/articlepdf/2014/dt/c3dt53302f

Fundamental chemistry of iodine. The reaction of di-iodine towards thiourea and its methyl-derivative: formation of aminothiazoles and aminothiadiazoles through dicationic disulfides.

/pdf/optical-test-strip-for-trace-hg-ii-based-on-doped-sol-gel-3s2npauvgk.pdf

Optical test strip for trace Hg(II) based on doped sol-gel film.

Synthesis of a novel bistriazene reagent 4,4'-bis[3-(4-phenylthiazol-2-yl)triazenyl]biphenyl and its highly sensitive color reaction with mercury(II).

By introducing Brønsted acidic ionic liquids (ILs), two dual-emitting lanthanide metal-organic complexes (Ln-MOCs) of {[Ln(imdc)(CH3OH)(H2O)3]Cl2}n (LnIMDC, Ln = Eu and Tb, imdc = 1,3-bis(carboxymethyl)imidazolium ion) were first prepared under solvothermal conditions. The crystal structures of LnIMDC were measured by single-crystal X-ray diffraction, and the crystal growth process of LnIMDC was carefully studied. It is found that the crystals are three-dimensional supramolecular structures built up by Ln-O coordination bonds and supramolecular forces. In the temperature range of 303-403 K, LnIMDC show good temperature-dependent emission properties with maximum relative thermal sensitivities of 3.29% K-1 at 375 K and 2.08% K-1 at 303 K for EuIMDC and TbIMDC, respectively. It is worth mentioning that both EuIMDC and TbIMDC exhibit good linear ratiometric emission-temperature response in temperature ranges of 353-403 and 323-373 K, respectively, which render EuIMDC and TbIMDC good ratiometric thermometers in high temperature range. Computational studies on the energy level of ILs [H2imdc]Cl and [imdc]- ion were performed, which validated the high energy transfer efficiency between the [imdc]- and Ln3+ ions and the unique solution concentration- and wavelength-dependent fluorescence properties of [H2imdc]Cl. The high fluorescence performance opens up new opportunities for practical applications of ILs in optical sensing.

Dual-Emitting Ratiometric Luminescent Thermometers Based on Lanthanide Metal-Organic Complexes with Brønsted Acidic Ionic Liquids.

Optimization of Synthesis Conditions, Characterization and Magnetic Properties of Lanthanide Metal Organic Frameworks from Brønsted Acidic Ionic Liquid

Photocatalytic degradation technology has developed rapidly in the treatment of organic pollutants due to its high efficiency, mild reaction conditions and easy control. In this paper, a series of heterogeneous photocatalysts, BWZ-en-R (BWZ = [BW11Z(H2O)O39]7−, Z = Zn, Cd, Mn, en = ethylenediamine, R = Merrifield resin), were prepared by using ethanediamine as a linker to immobilize Keggin-type transition elements substituting tungstoborates on Merrifield resin and characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The photocatalytic properties of BWZ-en-R (Z = Zn, Cd, Mn) for the degradation of methyl red (MR) were investigated. The results show that the BWZ-en-R (Z = Zn, Cd, Mn) photocatalysts exhibited high photodegradation ability for MR under the irradiation of ultraviolet light, and were easily separated from the reaction media. The maximum degradation rate (%) of MR (40 mL, 25 μM, pH = 2) reached 96.4% for the BWMn-en-R photocatalyst (40 mg) after being irradiated for 30 min, making this a promising photocatalyst candidate for dye degradation. Moreover, the influences of some factors, such as the Z-substituted elements in the BWZ, the BWZ-en-R dosage and the MR initial concentration, on the photocatalytic degradation rate of MR were also examined.

/pdf/a-series-of-polymer-supported-polyoxometalates-as-2bxed4lw.pdf

A Series of Polymer-Supported Polyoxometalates as Heterogeneous Photocatalysts for Degradation of Organic Dye

5-Methyl-2-[3-(4-phenylthiazol-2-yl)triazenyl]benzenesulfonic acid as a chromogenic reagent of N-cetylpyridinium chloride Synthesis, mechanism and analytical application.

Xiao-Ling He

Papers

Synthesis of a novel bistriazene reagent 4,4'-bis[3-(4-phenylthiazol-2-yl)triazenyl]biphenyl and its highly sensitive color reaction with mercury(II).

Dual-Emitting Ratiometric Luminescent Thermometers Based on Lanthanide Metal-Organic Complexes with Brønsted Acidic Ionic Liquids.

Optimization of Synthesis Conditions, Characterization and Magnetic Properties of Lanthanide Metal Organic Frameworks from Brønsted Acidic Ionic Liquid

A Series of Polymer-Supported Polyoxometalates as Heterogeneous Photocatalysts for Degradation of Organic Dye

5-Methyl-2-[3-(4-phenylthiazol-2-yl)triazenyl]benzenesulfonic acid as a chromogenic reagent of N-cetylpyridinium chloride Synthesis, mechanism and analytical application.