Showing papers on "Dithiocarbamate published in 1981"

Differential determination of chromium(VI)-chromium(III) with poly(dithiocarbamate) chelating resin and inductively coupled plasma-atomic emission spectrometry

Abstract: This investigation has demonstrated that the poly(dithiocarbamate) resin is usable for the differential determination of Cr(VI)-Cr(III) mixtures. In this example, a concentration factor of 12.5 was obtained. However, on the basis of previous experience with the poly(dithiocarbamate) resin both large sample volumes and smaller final solution volumes can be employed in order to increase the concentration factor. The present technique is suitable for chromium determination by inductively coupled plasma-atomic emission spectrometry (ICP-AES), atomic absorption spectrometry (AAS), and other spectrochemical methods. However, the low limit of detection for chromium achieved by electrothermal atomization AAS combined with a suitable small final digested resin solution volume may allow extension of the differential analysis to low initial Cr(VI) and Cr(III) concentration-levels. Although high chloride concentration does not interfere with the Cr(VI) determination in this technique, in the total chromium procedure a chloride concentration of greater than 250 mg of Cl/L prevents complete recovery of chromium possibly through the loss of chromyl chloride. In this situation, removal of chloride by precipitation with silver nitrate may be required. This limitation is not unique to the resin approach and is common in methods requiring oxidation of Cr(III) to Cr(IV). The present technique is not affected by largemore » concentrations of alkali and alkaline earth elements or manganese because these elements do not complex with the resin. In addition, the technique is simple and provides acceptable precision.« less

Complexation of some transition metals, rare earth elements, and thorium with a poly(dithiocarbamate) chelating resin

Abstract: Complexation properties of a poly(dithiocarbamate) resin for Fe(III), Fe(II), Cr(VI), Cr(III), V(V), V(IV), T(IV), Mo(VI), W(VI), Th(IV), 14 rare earth elements, and Os are examined by inductively coupled plasma-atomic emission spectrometry (ICP-AES) Fe(III) and Cr(VI) complex with the resin, whereas Fe(II) and Cr(III) do not Considerable differences in uptake also exist between V(V) and V(IV) and Ce(III) and Ce(IV) The digestion of the resin with nitric acid followed by dilution with (3 + 1) nitric acid-water is suitable for inductively coupled plasma-atomic emission spectrometry except for W

Organomolybdenum based additives and lubricating compositions containing same

Abstract: This invention relates to synergistic antiwear compositions comprising a sulfurized molybdenum dialkyldithiocarbamate and an organic sulfur compound selected from the group consisting of dithiocarbamate acid esters, sulfurized oils and polysulfurized olefins. Lubricating compositions containing the synergistic compositions possess good antiwear properties and improved extreme pressure and oxidation stability.

Stabilized halogenncontaining resin composition

Abstract: PURPOSE:A halogen-containing resin composition having improved coloration, long- term heat stability and weather resistance, prepared by adding to a halogen-containing resin, an organic sulfur-containing antimony compound and an organic nickel salt compound CONSTITUTION:To 100ptswt of a halogen-containing resin are added 001- 10ptswt of (A) an organic sulfur-containing antimony compound having an Sb-S group and 00001-5ptswt of at least one organic nickel salt compound selected from the group consisting of nickel carboxylate, nickel phenolate, nickel dithiocarbamate and a nickel salt of an organic phosphorus-containing oxyacid As the organic sulfur-containing antimony compounds, there can be mentioned a compound represented by formula I Exemplary of the nickel carboxylate is a compound represented by formula II Exemplary of the nickel phenolate is a compound represented by formula III Exemplary of the nickel dithiocarbamate is a compound represented by formula IV And exemplary of the nickel salt of an organic phosphorus-containing oxyacid is a compound represented by formula V

A crystallographic and spectroscopic study of mercury(II) dithiocarbamate

Abstract: Ammonium dithiocarbamate, H2NCS2NH4, decomposes easily but the anion forms a stable mercury(II) complex, the crystals of which are orthorhombic with a = 7.851(3), b = 17.565(7), c = 12.051(3) A, an...

Reaction with metal ions of chloromethylated polystyrene resin containing dithiocarbamate group

Abstract: The derivatives of poly(chloromethylstyrene) resin (PCMS) with N-methyl-N-carboxylmethyldithiocarbamate (1), N,N-di(..beta..-hydroxyethyl)dithiocarbamate (2), N-methyl-N-carboxylmethylamino (3), and di(..beta..-hydroxyethyl)amino (4) groups were prepared, and the metal ion reactivity of the polymer resins with these functional groups were investigated. Additionally, the effect of ..gamma.. irradiation on the reaction with metal ion was also investigated. In the reaction of PCMS under the same conditions, the substitution ratio order is as follows: (2) > (1) > (4) > (3). In the reaction of the resins with cupric ion, the reaction amount reached a maximum of 4.17 mequiv/g for resin (1) and 4.75 mequiv/g for (2). The polymers containing sulfur atom have a large reactivity toward metal ion in comparison to the polymers without sulfur atom. The reactivity of polymer (1) toward metal ions decreased in the following order: Ag(I) >> Cu(II) > Zn(II)greater than or equal to Ni(II) greater than or equal to Co(II). The other metal ions, except Ag(I) and Cu(II), hardly reacted with polymer (2). Thus, polymer (2) has a remarkable selectivity. It was also found that the reaction amount of polymers containing sulfur after ..gamma.. irradiation is almost the same as that before ..gamma.. irradiation.

Metal exchange reactions between divalent metal ions and their dithiocarbamate complexes in dimethyl sulfoxide: a kinetic and mechanistic study

Abstract: The kinetics and mechanism of metal exchange between NiII, CuII, ZnII, CdII, PbII and HgII and their dithiocarbamate complexes have been studied in dimethyl sulfoxide. Two pathways for ligand transfer are observed. The first involves dissociation of dithiocarbamate from the metal complex followed by substitution at the metal ion, while the second involves direct electrophilic attack by the metal ion on the dithiocarbamate complex. The relative importance of the pathways depends on the stability of the complex and the substitution lability and electrophilic character of the metal ion. The stability of the dithiocarbamate complexes in dimethyl sulfoxide is in the order Hg > Cu > Ni > Pb ≈ Cd > Zn.

Synthesis and Characterisation of Bis(η5-Fluorenyl)N,N-disubstituted-dithiocarbamatochlorotitanium(IV) and Zirconium(IV) Componds

Abstract: Some bis(η5-fluorenyl)N,N-disubstituteddithiocarbamatochloro-titanium(1V) and zirconium(1V) compounds of the type (η5-C13H9)2 Ti(S2CNRR1)Cl and (η5-C13H9)2 Zr(S2CNRR1)Cl (where R = alkyl and R′ = aryl or cyclohexyl) have been prepared by the reaction of bis(η5 -fluorenyl)titaniun(IV)dichloride and bis(η5-fluorenyl)zirconium(IV)dichloride with the sodium salt of N,N-disubstituted dithiocarbamates. A study of molecular weight, conductance, infrared spectra and magnetic susceptibility in addition to elemental analysis has been carried out to throw some light on the probable structure of these derivatives. These studies show that the complexes are monomeric, non-electrolytes in which the dithiocarbamate group acts as a bidentate ligand.

High-performance Liquid Chromatographic Determination of Organic Substances by Metal Chelate Derivatization. I. Dithiocarbamate Chelates of Aliphatic Amines

Abstract: The use of the conversion of aliphatic primary and secondary amines into metal dithiocarbamate chelates was examined for high-performance liquid chromatographic determination of these amines. Characteristic chromatogram patterns based on the difference in the rate of ligand exchange were obtained for different central metal ions. When Hg(II) chelates were tested, trace determination of individual secondary amines was possible because only the peaks of binary complexes corresponding to each amine appeared on chromatograms. When Ni(II) and Pd(II) chelates were tested, peaks to ternary complexes as well as those of binary complexes appeared on chromatograms. This phenomenon was applied to the determination of optical purity of optically active amines. A description is given of applications to microdetermination of antiasthmatic ephedrine isomers, to determination of their optical purity in Chinese crude drugs, and to their preparation.

Notes. Open-shell molybdenum carbonyl complexes and the binding of π-acid ligands to higher-oxidation-state molybdenum sites

Abstract: Molybdenum sites which have a mixed-ligand tertiary phosphine and dithiocarbamate environment bind carbon monoxide at three oxidation levels, MoII and open-shell MoIII and MoIV. The complex [MoIII(CO)(S2CNEt2)2(Ph2PCH2CH2PPh2)]+ is stable in tetrahydrofuran at 0 °C and may be prepared by low-temperature controlled-potential electrolysis. The open-shell MoIII–CO and MoIV–CO complexes are new; their significance to the binding of π-acid ligands to higher-oxidation-state molybdenum sites in the nitrogenase system is briefly discussed.

Preparation of iron organic carboxylate

Abstract: PURPOSE: To obtain the titled compound usable as a catalyst, etc. in a short time at a low temperature, by dissolving iron powder in an organic carboxylic acid in the presence of a dialkyl dithiocarbamate as a dissolution accelerator under the flow of molecular oxygen. CONSTITUTION: Iron powder, usually a particle size in the range of 50W500mesh, is dissolved in an organic carboxylic acid preferably by using air directly at an air flow rate of 1.5W2.0l/g iron powder/hr under the flow of molecular oxygen to prepare an iron organic carboxylate. In the process, a dialkyl dithiocarbamate in an amount of 0.1W30wt%, preferably 1W5wt%, based on the iron powder added thereto is present, and the reaction is carried out at 50W100°C for 50W 100min. Acrylic acid or methacrylic acid in which the iron powder is slightly siluble is particularly effective, and the dialkyl dithiocarbamate has a polymerization inhibiting ability for polymerizable unsaturated carboxylic acids. COPYRIGHT: (C)1982,JPO&Japio

Mass spectral fragmentation of metal dithiocarbamate complex salts

Abstract: A summary of the mass spectra of metal dithiocarbamate complex salts (ML2 and ML3) is presented. Only divalent metal dithiocarbamate ions without an electronic configuration containing an inert s-orbital electron pair exhibited both expulsion of a ligand radical (L) and the neutral even electron species (L–H) generated from the ligand via hydrogen transfer to the metal-containing fragment ion. Divalent metal dithiocarbamate ions can be generated either by direct electron impact ionization of gas phase ML2 molecules or ionization of ML3 molecules followed by loss of a ligand radical. A highly stable sp2 hybridized, gas phase ion of a monobidentate lead dithiocarbamate complex is proposed.

Aqueous adhesive composition

Abstract: PURPOSE:To provide titled compsn. which is useful for bonding of a rubber to a hard support such as a metal by vulcanization and in which adhesive power is greatly improved, by a method wherein a dithiocarbamate is added to a specified halogen- contg. bipolymer latex. CONSTITUTION:There is provided an aq. adhesive compsn. consisting mainly of a dithiocarbamate of the formula (wherein R1, R2 are alkyl, cycloalkyl, aryl; M is a metal; n is 1-4) and a halogen-contg. bipolymer latex composed of alpha-haloacrylonitrile and 2,3-dichloro-1,3-butadiene as copolymer components. EFFECT:Effective in bonding of a rubber to a support such as a metal which is undercoated with a phenolic resin primer.

Conformation And C-N Rotational Barrier Of Dithiocarbamate Esters Nmr And Molecular-Orbital Studies

Abstract: The variable temperature proton and ambient temperature carbon-13 NMR spectra of S-methyl dithiocarbamate esters have been recorded. The results of the theoretical energy calculations (CNDO/2 and EHT types) together with the experimental data have been interpreted in terms of the molecular conformations. The barrier heights for the rotation about the thioamide C—N bond are calculated using the CNDO/2 method and the results are discussed in terms of the computed charge densities and bond orders.

Some Aspects of the Solvent Extraction-spectrophotometric Determination of Copper Dithiocarbamate Complex in Strongly Acidic Media

Abstract: The time stability of the extracted complexes in isobutyl methyl ketone depends on the pH of the washing solution of the extract and on the stability of the metal complex. The extract is stable to concentrated acid when the organic extract is separated rapidly and washed with water. Copper (II) tetramethylenedithiocarbamate is quantitatively extracted from 1–6 and 1–2 mol dm−3 hydrochloric and nitric acid media respectively.

Diphanoxy Bis(dithiocarbamato) titanium (IV)/zirconium (IV) Complexes

Abstract: Diphenoxy bis (dithiocarbamato) titanium(IV)/zirconium(IV) complexes of the type (C6H5O)2M(S2CNR2)2 and (C6H5O)2M(S2CNRR′)2 (where M = Ti(IV), Zr(IV), R = Me, Et, i-Pr and R′ = cyclohexyl) have been prepared by the reaction of stoichiometric amounts of diphenoxy titanium (IV) dichloride and sodium salts of dithiocarbamic acid in refluxing tetrahydrofuran. The corresponding zirconium complexes have been synthesised starting from diphenoxy zirconium (IV) dichloride. These complexes have been characterised on the basis of elemental analyses, magnetic susceptibility measurements, electrical conductance, I.R., U.V., visible and N.M.R. spectra. I.E. and U.V. spectral studies demonstrate that the dithiocarbamate moiety behaves as a bidentate ligand in all the prepared complexes. Conductance measurements reveal that the compounds are non-electrolytes.

Heat-resistant polyurethane composition

Abstract: PURPOSE:The titled composition with excellent heat resistance and improved solubility in a raw material for a dithiocarbamate compd., useful for a resin necessitating heat resistance, etc., which contains a thiuram compd. and a dithiocarbamate compd. CONSTITUTION:A thiuram compd. of formula I (A) (wherein R1, R2, R3 and R4 are 1-4C alkyl, phenyl or a group. forming a hetero group. in formula as II and III; n is 1-4) (e.g., tetraethylthiuram disulfide) and a dithiocarbamate compd. of formula IV (B) (wherein R5 and R6 are 1-4C alkyl, phenyl or a group. forming a hetero group. in formula V; m is 1-4; M is Fe, Co, Ni, Cu, Zn, Te or Se of valance m) (e.g., copper dimethyldithiocarbamate), are added to a polyurethane composition. About 0.001-10wt% component B is added to the polyurethane composition. Component A and component B are used in a wt. ratio of 0.1-10:1.

Metal salt from polydithiocarbamic acid and monofunctional dithiocarbamic acid

Abstract: NEW MATERIAL:The titled compound that is obtained by binding two functional groups through a divalent or more valent metal wherein one is a polydithiocarbamyl group of formula I [X is divalent aliphatic chain; Y is formula II (R1 is H, hydroxyl, alkyl; R2 is H, hydroxymethyl, thiol; m is 0 or positive integer)] and the other is a monofunctioal dithiocarbamyl group of formula III (A, B are H, alkyl, amino). EXAMPLE:Sodium N-(2-mercaptoethyl)ethylenebisthiocarbamate. USE:Agent for killing harmful organism in industrial and agricultural fields: they are useful as antibacterial, antifungal, insecticide, acaricide and herbicide. PREPARATION:A mixture solution containing a polydithiocarbamate soluble salt of formula I and a monofunctional dithiocarbamate soluble salt of formula III is combined with a soluble metal salt such as zinc chloride or manganese sulfate in a solvent to effect double decomposition to give the titled compound.

Bis(substituted phenyl)alkyltin compounds

Abstract: OF THE DISCLOSURE Asymmetrically substituted triorganotin compounds of the general formula or wherein R1 is hydrocarbyl or -R2COOR3 where R2 s alkylene and R3 is hydrocarbyl X is halogen, hydroxyl, R4COO- where R4 is hydrocarbyl, -oR4, -SR4, -SR5COOR4 where R5 is alkylene, , carbamate or dithiocarbamate; Y is chlorine or bromine; Z is halogen, alkyl, trihalomethyl, alkoxy, thioalkoxy, phenyl or methylsulfonyl; a is O or 1 and A is oxygen or sulfur are useful fungicides and exhibit little or no phytotoxi-city.

Preparation and Characterisation of Bis (η5-Cyclopentadienyl) N,N-Disubstituted Dithiocarbamato Chloro Oxotungsten (VI) Complexes

Abstract: Bis (η5-cyclopentaienyl) N,N-disubstituted dithiocarbamato chloro oxotungsten (VI) complexes of the type η5-Cp2WO(S2CNR2)Cl and η5-Cp2WO(S2CNRR')Cl (where R=Me, Et and i-Pr and R'=Cyhx) have been prepared by the reaction of bis (η5-cyclopentadienyl) oxotungsten (VI) dichloride with sodium salts of dithiocarbamic acids in refluxing tetrahydrofuran. Infrared spectral studies demonstrate that in these complexes dithiocarbamate ligands are bidentate. Therefore, tungsten (VI) atom may be assigned a coordination number 6 in all these complexes. Elemental analyses of these compounds have also been carried out. Electronic spectra have been recorded for all the six complexes.

Preparation of isothiocyanate ester

Abstract: PURPOSE:To obtain the titled compound useful as a synthetic raw material for a tetrazole which is a raw material for cephalosporin antibiotic industrially and advantageously, by reacting a dithiocarbamate with cyanamide. CONSTITUTION:(A) A dithiocarbamate expressed by the formula (R is alkyl, aralkyl or aromatic group) is reacted with (B) cyanamide to give the titled compound. In the process, (a) carbon disulfide and (b) a primary amine expressed by the formula R-NH2 which are synthetic raw materials for the component (A) are reacted with the component (B) preferably in one stage. Thus, the component (B) and the component (a) are dissolved in a solvent, e.g. acetone, and an aqueous solution of the component (b) is dopped to the resultant solution and reacted at 0-50 deg.C. After completing the reaction, the deposited thiourea is filtered, and the solvent is distilled off. The reaction mixture is then subjected to the vacuum distillation to give the aimed compound.