Diethyldithiocarbamate complexes

Selenium is extracted as diethyldithiocarbamate complex from the solution containing citrate and EDTA [5]. Ohta and Suzuki [6] found that only a few elements, such as copper, bismuth, arsenic, antimony, and tellurium, are also extracted together with selenium. They examined this for effects of hundredfold amounts of elements co-extracted with the selenium diethyldithiocarbamate complex. An appreciable improvement of interferences from diverse elements was observed in the presence of copper. Silver depressed the selenium absorption in the case of atomisation of diethyldithiocarbamate complex, but the interference of silver was suppressed in the presence of copper. The atomisation profile from diethyldithiocarbamate complex was identical with that from selenide. 

Various other techniques have been used to determine molybdenum, including adsorption voltammetry [510], electron-paramagnetic resonance spectrometry [512], and neutron activation analysis [513,514]. EPR spectrometry is carried out on the isoamyl alcohol soluble Mo(SCN)s complex and is capable of detecting 0.46 mg/1 molybdenum in seawater. Neutron activation is carried out on the /J-naphlhoin oxime [514] complex and the pyrrolidone dithiocar-bamate and diethyldithiocarbamate complex [513]. The neutron activation analysis method [514] was capable of determining down to 0.32 xg/l of molybdenum in seawater. 

Lobinski et al. [72] optimized conditions for the comprehensive speciation of organotin compounds in soils and sediments. They used capillary gas chromatography coupled to helium microwave induced plasma emission spectrometry to determine mono-, di-, tri- and some tetraalkylated tin compounds. Ionic organotin compounds were extracted with pentane from the sample as the organotin-diethyldithiocarbamate complexes then converted to their pentabromo derivatives prior to gas chromatography. The absolute detection limit was 0.5pg as tin equivalent to 10-30pg kg-1. 

Sodium diethyldithiocarbamate, dimethyldithiocarbamate and disulphuram are potent inhibitors of the enzyme dopamine-0-hydroxylase of brain, possibly because of chelation of copper. The copper-diethyldithiocarbamate complex penetrates the central nervous system more readily than does copper ion, itself. These effects slow the disappearance of pentobarbitone from plasma and produce behavioural changes in rats180. ... 

The stability of diethyldithiocarbamate complexes with metals decreases in the following order ... 

A spectrophotometric technique has been used for quantifying pg/mL levels of free and acid-labile (chemically bound) carbon disulfide in the blood of rats (Lam and DiStefano 1982, 1983). This technique is based on measuring the absorbance at 430 nm of a yellow cupric diethyldithiocarbamate complex that is formed by reacting carbon disulfide in blood with Viles reagent in the presence of acid and heat. A headspace sampler connected to GC equipped with a sulfur-specific flame photometric detector (FPD) has been developed for measuring low levels of free and acid-labile carbon disulfide in the blood of shift workers exposed to carbon disulfide (Campbell et al. 1985). A detection limit of 15.2 pg of carbon disulfide/L of blood was achieved. Concentrations of free and acid-labile carbon disulfide have also been determined by GS/MS (Brugnone et al. 1993, 1994 Perbellini et al. 1994). 

Quantitative. Classically, silver concentration in solution has been determined by titration with a standard solution of thiocyanate. Ferric ion is the indicator. The deep red ferric thiocyanate color appears only when the silver is completely titrated. Gravimettically, silver is determined by precipitation with chloride, sulfide, or 1,2,3-benzotriazole. Silver can be precipitated as the metal by electrodeposition or chemical reducing agents. A colored silver diethyldithiocarbamate complex, extractable by organic solvents, is used for the spectrophotometric determination of silver complexes. 

Nalbandyan, 1982 Hodgson and Fridovich, 1975 Asada et al., 1975), whereas azide inhibits the enzymes in the following order iron > manganese > copper/zinc superoxide dismutase (Misra and Fridovich, 1978). Diethyldithiocarbamate is another well-characterized inhibitor of the copper/zinc superoxide dismutase (Heikkila et al., 1977). It forms a complex with the copper and removes the metal from all the protein ligands. The copper-diethyldithiocarbamate complex can be separated without affecting the zinc content of the protein (Cocco et al., 1981). 

Grignard reactions, e.g. butylation or pentylation, are widely used for the determination of alkyl-Pb and -Sn species the reaction yields products which can be separated relatively easily by GC. Water destroys the reagent and the species of interest has therefore to be removed from water-based matrices, which may be achieved by extraction of a diethyldithiocarbamate complex into an organic phase prior to derivatization, as in the case of alkyl-Pb species determination [17] this back-extraction increases the risks of contamination or losses. With the increasing use of this technique followed by GC-MIP-AES, the sub-pg detection limits obtained for Pb, Sn and Hg species has necessitated... 

Cu-diethyldithiocarbamate complex is formed and extracted into CCI4... 

Wang and co-workers have recently reported a generalized strategy for the synthesis of a variety of ternary metal sulfides with controlled size, morphology, (Fig. 25) crystallographic phase and stoichiometric composition. This one pot synthetic approach is primarily based on co-thermal decomposition of diethyldithiocarbamate complexes of corresponding metals in oleylamine and dodecanethiol surfactants. 

Complex 6 was obtained by the reaction of the rm-trimethylphosphine-substituted complex 5 with diethyldithiocarbamate.Complex 6 exhibits an IR absorption for the... 

Currently, the Cambridge Structural Database contains data for 1500 chelating dithiocarbamate ligands. Table III provides structural data for simple diethyldithiocarbamate complexes of aU the transition metals (where available). 

Figure 57. Infrared data (cm ) for some bis(diethyldithiocarbamate) complexes (3800- MX) cm in KBr 6(H) 12(H) cm in nujol).

St. Nikolov and Atanasov recorded vibrational spectra for a number of diethyldithiocarbamate complexes, [M(S2CNEt2)2l (M = Ni, Cu, Cd, Zn), both in solution and the solid state, a comparison allowing structural changes that may occur upon dissolution to be assessed (521, 522). In all cases, enhanced symmetry was seen upon dissolution, consistent with the removal of intermo-lecular contacts found in the solid state. 

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