Isotope exchange study of bis/diethyl dithio carbamate/cadmium/II/ complex

Isotope exchange behaviour of bis/diethyl dithio carbamate/cadmium/II/ complex has been studied at 25°C and 35°C varying the concentrations of both metal ion and the complex. The results show that the complex is kinetically labile and the concentration has a significant effect on the rate of the reaction. Increase in temperature also effects the rate of exchange.     

Isotope exchange between bis/diethyl dithiocarbamate/ copper/II/ complex and Cu2+ ion

Isotope exchange behaviour of bis/diethyl dithiocarbamate/ copper/II/ complex has been studied at 30 °C and 40 °C varying the concentration of the complex and metal ion. Results indicate that the complex is labile in chloroform dimethyl sulphoxide medium. Increase in concentration has significant effect on the rate of the reaction. Similarly the increase in temperature increased the rate of the reaction.     

Homogeneous isotope exchange between thiourea and bis(thiourea)mercury(II) complex

The isotope exchange behavior of thiourea with bis(thiourea)mercury(II) complex has been studied. The concentrations of both the metal ion and the complex were varied. The results show that the complex is labile in the kinetic sense. An increase in concentration increases the rate of exchange. Increase in temperature also results in an increase of the rate of exchange.     

Ion exchange behaviour of zirconium phosphate with mercury(II) solutions

Ion exchange behaviour of Zr(HPO₄)(NaPO₄)·5H₂O towards HgCl₂ solutions has been examined. Na⁺ and H⁺ ions were released by the exchanger in a ratio which depended on the pH. Uptake and rate of exchange were relatively high considering that Hg is strongly bound to chloride. Higher uptake and faster exchange were obtained by using an expanded phase of α-ZrP in acid Hg(NO₃)₂ solutions. Normal α-ZrP in the same conditions, exhibited low uptake and very slow rate of exchange.     

Cation exchange behaviour of mercury (II) on Dowex 50W-X8

Summary Quantitative studies are reported on the behaviour of mercury at milligram level, using cation exchange resin Dowex 50W-X8. Various eluants such as nitric acid, hydrochloric acid, sulphuric acid, ammonium acetate, sodium nitrate solutions, sodium nitrate-nitric acid mixtures, ammonium acetate-acetic acid mixture are used for column operation. The elution constants are evaluated. Mercury(II) is separated from different cations, i.e., Ca²⁺, Ba²⁺, Sr²⁺, Mg²⁺, Fe³⁺, Al³⁺, Co²⁺, Ni²⁺, Zn²⁺, Cu²⁺ by selective elution.

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Zusammenfassung Das Verhalten von mg-Mengen Quecksilber am Kationenaustauscher Dowex 50W-X8 wird quantitativ untersucht. Dabei werden folgende Eluierungsmittel benutzt: Salpetersäure, Salzsäure, Schwefelsäure, Lösungen von Ammoniumacetat und Natriumnitrat sowie die Gemische Salpetersäure-Natriumnitrat und Essigsäure-Ammoniumacetat. Die Elutionskonstanten werden berechnet. Durch selektive Eluierung kann Quecksilber von mehreren Kationen (Ca²⁺, Ba²⁺, Sr²⁺, Mg²⁺, Fe³⁺, Al³⁺, Co²⁺, Ni²⁺, Zn²⁺, Cu²⁺) getrennt werden.

     

Mercury exchange between diphenylmercury and bis(p-chlorophenyl)mercury

Experimental methods for investigating mercury exchange between diphenyl mercury and bis(p-chlorophenyl)mercury have been evaluated and kinetic parameters determined using a novel partition technique. An octahedral transition state has been proposed. The investigation was complicated by a relatively fast reaction rate, and the kinetic interference of impurities or hydrolysis products.     

Isotope exchange study of tris/diethyl dithiocarbamate/chromium/III/ complex

Metal exchange behaviour of tris/diethyl dithiocarbamate/ chromium/III/ complex has been studied at 25°C and 35°C varying the concentration of the metal ion and the complex. Experimental observation showed that the complex is kinetically labile. Temperature and concentration increase, increases the rate of reaction.     

Investigation of a mercury(II) carbene complex: bis(1,3-dimethylimidazol-2-ylidene) mercury chloride

The reaction of 1,3-dimethylimidazolium chloride with Hg(O₂CCH₃)₂ afforded a bis(carbene)mercury(II) complex (2), which is characterized by multinuclear NMR spectroscopy (¹H, ¹³C, ¹⁵N, and ¹⁹⁹Hg) and by single-crystal X-ray analysis. As a consequence of chloride-ion interaction with the mercury center, the C₂-Hg-C₂ angle in 2 is reduced to 161.4 (3)° compared to its near-linear value in complex 4 that contains perchlorate counterions. The C₂ resonance in the mercury complex 2 moves upfield by 36.96 ppm relative to the parent carbene (2), with a large ¹J_HgC = 2741.18 Hz. © 1996 John Wiley & Sons, Inc.     

Reaction of halogens with copper(II) bis(diethyldithiocarbamate)

Conclusions It was established by EPR spectroscopy that the reaction of halogens with Cu(dtc)₂ has redox character in polar and nonpolar solvents. However, the ligand is oxidized in a polar solvent, and new complexes of copper(II), the coordination sphere of which is formed via different combinations of solvent molecules, halide ions, and dtc^–, are formed as a result of intraspheral transformations.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2484–2488, November, 1988.     

Homogeneous isotopic exchange between nickel(II) and bis(diethyldithiocarbamato)nickel(II) complex

Isotopic exchange behaviour of bis(diethyldithio carbamate) nickel(II) complex with nickel(II) in chloroform and methanol medium was studied. The studies were carried out at different temperatures varying the concentration of both metal ion and the complex. The results show that the complex is labile in the kinetic sense. Increase in temperature increases the isotopic exchange rate. The increase in concentration also results in enhancement of the rate of reaction.     

Homogeneous isotope exchange between copper/II/ and copper/II/-resacetophenone phenylhydrazone complex

Isotope exchange of copper/II/ between bis/resacetophenone phenylhydrazone/ copper/II/ complex and copper/II/ in trin-butyl phosphate and methanol medium was studied. The experiments were carried out at different temperatures varying the concentration of both metal ion and the complex. The results show that the complex is kinetically labile. An increase in temperature increases the rate of isotope exchange. The increase in concentration also results in the enhancement of the rate of reaction.     

Homogeneous isotopic exchange between nickel(II) and bis(resacetophenone oxime) nickel(II) complex

Isotopic exchange behaviour of bis(resacetophenone oxime) nickel(II) complex with nickel(II) in tri-n-butyl phosphate (TBP) and ethanol medium has been studied. The studies were carried out at different temperatures by varying the concentrations of both metal ion and the complex. Experimental observations showed that the complex is kinetically labile. Increase in temperature increases the isotopic exchange rate. Increase in concentration of either metal ion or complex results in significant increase of the reaction rate.     

Homogeneous isotope exchange between copper(II) and bis(resacetophenone oxime)copper(II) complex

Isotope exchange behavior of bis(resacetophenone oxime)copper(II) complex with copper(II) in tri-n-butyl-phosphate and methanol medium has been studied. The studies were carried out at different temperatures varying the concentration of both metal ion and complex. The results show that the complex is labile in the kinetic sense. Increase in temperature increases the isotope exchange rate. The increase in concentration also results in enhancement of the rate of reaction.     

Homogeneous isotope exchange between nickel(II) and bis(resacetophenone phenylhydrazone) nickel(II) complex

Isotope exchange behavior of bis-resacetophenone phenylhydrazone) nickel(II) complex with nickel(II) in tri-n-butyl phosphate and methanol medium has been studied. The studies were carried out at different temperatures varying the concentration of both metal ion and the complex. The results show that the complex is labile in the kinetic sense. Increase in temperature increases the isotope exchange rate. The increase in concentration also results in an enhancement of the rate of reaction.     

Unreported coordination behaviour of a bis(semicarbazone) ligand in a lead(II) complex

A novel lead(II) complex with the Schiff base benzil bis(semicarbazone), [Pb(LH₂)₂(NO₃)]NO₃ · 1/2H₂O, has been synthesised and structurally characterized as well as the free ligand. The coordination number of Pb(II) is seven provided by two neutral ligand molecules and one nitrato group. The most interesting characteristic of this complex is the different behaviour observed in the two bis(semicarbazone) molecules. One of them is a N₂O₂ chelate ligand, whereas the other one is bonded to the lead ion only through one of the semicarbazone branches. The seventh position in the lead coordination sphere is provided by one oxygen atom from a nitrato ligand.     

Sulfite-sensitive solvent/polymeric-membrane electrode based on bis(diethyldithiocarbamato)mercury(II)

A new solvent/polymeric-membrane electrode which exhibits significant potentiometric response toward sulfite ion in the 1 × 10_?6?1 × 10^?3 M range is described. The membrane is prepared by incorporation of neutral bis(diethyldithiocarbamato)mercury (II) in a thin film of plasticized poly (vinyl chloride). In sharp contrast to classical Hofmeister behavior, the resulting membrane displays little or no response to a wide range of anions (log K^pot_i,j ? ?4, i being sulfite) including sulfate, nitrate, nitrite, chloride, perchlorate, salicylate, and alkylsulfonates. Bromide and thiocyanate are moderate interferents, while significant response to iodide, thiosulfate, and sulfide is observed. These selectivity data, along with other response characteristics of the membrane, are used to postulate the mechanism by which the electrode responds to sulfite. Preliminary studies demonstrate that the electrode can be used in conjunction with an outer gas-permeable membrane for highly selective detection of total sulfite species in the form of sulfur dioxide.     

Liquid-liquid extraction behaviour of mercury(II) as chloride

The solvent extraction behaviour of mercury(II) chloride with different organic solvents has been studied. The effect of acidity, temperature, concentration of Hg(II), and other anions has been studied. Radicchemical separations from ions such as Fe(III), Ga(III), As(III) and Sb(V) can be accomplished. Au(III) and Tl(III) interfere.     

Interaction of bis(trimethylsilyl)acetylene complex of titanocene with mercury trifluoroacetate

The reaction of the bis(trimethylsilyl)acetylene complex of titanocene Cp₂Ti(Me₃SiC₂SiMe₃) with mercury trifluoroacetate (NF₃COO)₂Hg at 20 °C in a THF medium affords titanocene bis(trifluoroacetate) Cp₂Ti(OCOCF₃)₂ and metallic mercury. The structure of Cp₂Ti(OCOCF₃)₂ was established by the analytical and spectroscopic methods and X-ray diffraction analysis.