ECOLOGICALY SAFE REAGENT RECYCCLING OF CARBON BISULPHIDE OF THE HEAD FRACTION OF BY PRODUCT COKE INDUSTRIES

У статті розглянуто технологічні особливості виділення головної фракції сирого бензолу на сучасних коксохімічних виробництвах, проведено огляд наявних методів переробки головної фракції та утилізації сірковуглецю, запропоновано реагентний метод вилучення сірковуглецю з утворенням солей N,N-діалкілдитіокарбамінових кислот та їхнє подальше перспективне практичне використання.В статье рассмотрены технологические особенности выделения головной фракции сырого бензола на современных коксохимических производствах, проведен обзор существующих методов переработки головной фракции и утилизации сероуглерода, предложен реагентный метод извлечения сероуглерода с образованием солей N,N-диалкилдитиокарбаминовых кислот, и также дальнейшее их перспективное практическое использованиеThe paper considers technological peculiarities of extraction of head fraction of crude benzene at modern enterprises of by-product coke industry, the survey of existing methods of recycling of heat fraction and utilization of carbon bisulphide is carried out reagent method of carbon bisulphide extraction with formation of dialkyldithiocarbamine acides is suggested, their further possible practical application is considere

Estudio potenciométrico de la respuesta de una membrana líquida selectiva a plata

Un electrodo selectivo de membrana de PVC basado en(5-(4-dimetilamino)benzilidin)rodanina como ionóforo fue fabricado para la determinación de ion Ag(I). El ESI exhibió respuesta nerstiana en el rango de 1x10-2 a 10-7 mol/dm3 con pendiente de 58,24 mV·dec -1 y un límite de detección de 9,77x10-7 mol/dm3. El ESI mostró una gran preferencia para Ag(I) sobre otros iones con buena precisión. El coeficiente de selectividad fue determinado para Zn(II), Cu(II), Pb(II) y Cd(II). El coeficiente de selectividad de esos iones esta en el rango de 7,2 x10 -3-1,5 x10-3

[(Pyrrolidin-1-yl)carbothio­ylsulfan­yl]methyl pyrrolidine-1-carbodithio­ate

The title compound, C11H18N2S4, was unexpectedly obtained during studies on the reactivity of the complex tris­(acac-κ2 O,O′)gallium(III) (acac is acetyl­acetonate) with C4H8NCS2H in dichloro­methane. The title compound shows disordered two pyrrolidine rings with major and minor occupancies of 0.546 (4) and 0.454 (4). Two (pyrrolidin-1-yl)carbothio­ylsulfanyl units are linked together through a methyl­ene C atom and weak C—H⋯S inter­actions are found

(μ-4,4′-Bipyridine-κ2 N:N′)bis­[bis­(N,N-dimethyl­dithio­carbamato-κ2 S,S′)zinc(II)]

The title dinuclear ZnII complex, [Zn2(C3H6NS2)4(C10H8N2)], is centrosymmetric; the mid-point of the C—C bond linking the two pyridine rings is located on an inversion center. The pyridine N atom coordinates to the ZnII cation, which is also chelated by two dimethyl­dithio­carbamate anions, giving a trigonal-bipyramidal ZnNS4 geometry. Weak inter­molecular C—H⋯S hydrogen bonding is present in the crystal structure

Coordination Chemistry and QTAIM Analysis of Homoleptic Dithiocarbamate Complexes, M(S2CNiPr2)4, M = Ti, Zr, Hf, Th, U, Np

In a systematic approach to comparing the molecular structure and bonding in homoleptic transition-metal and actinide complexes, a series of dithiocarbamates, M(S2CNiPr2)4 (M = Ti, Zr, Hf, Th, U, Np), have been synthesized. These complexes have been characterized through spectroscopic and X-ray crystallographic analysis, and their bonding has been examined using density functional theory calculations. Computational results indicate that the covalent character associatedSave with the M-S bonds shows the trend of Hf < Zr < Th < Ti < U ≈ Np. © 2018 American Chemical Society

Aqua(glycinato)(3,4,7,8-tetramethyl-1,10-phenanthroline)copper(II) Nitrate

In the title compound, [Cu(C2H4NO2)(C16H16N2)-(H2O)]NO3, CuII displays distorted square-pyramidal coordination where the water molecule is in the apical position and the base is defined by the N and one of the O atoms from the glycinate ligand, and both phenanthroline N atoms. The phenanthroline chelate-ring plane (N1, C12, C11, N2, Cu) is slightly distorted from planarity, whereas the five-membered ring formed by the glycinate ligand (defined by atoms N3, C18, C17, O1 and Cu), presents a distorted half-chair conformation

X-ray Crystal Structures and the Facile Oxidative (Au−C) Cleavage of the Dimethylaurate(I) and Tetramethylaurate(III) Homologues

Dimethylaurate(I) has been prepared as the crystalline tetrabutylammonium salt for comparison with the known tetramethylaurate(III) analogue. The linear structure of dimethylaurate(I) and the square-planar structure of tetramethylaurate(III) have both been confirmed by X-ray crystallography. One-electron oxidation of dimethylaurate(I) by either ferrocenium or arenediazonium cations produces the metastable dimethylgold(II) intermediate, which can be trapped as the paramagnetic 9,10-phenanthrenequinone (PQ) adduct. Otherwise, dimethylgold(II) is subject to rapid reductive elimination of ethane and affords metallic gold (mirror). The analogous oxidation of tetramethylaurate(III) by ferrocenium, arenediazonium, or nitrosonium cations also proceeds via electron transfer to generate the putative tetramethylgold(IV) intermediate. The highly unstable (CH3)4AuIV spontaneously undergoes homolytic cleavage to produce methyl radical and the coordinately unsaturated trimethylgold(III), which can be intercepted by added triphenylphosphine to afford Me3AuIIIPPh3

Synthesis of carbon-11 radiolabelled transition metal complexes using 11C-dithiocarbamates

A novel radiolabelling method exploiting 11C-dithiocarbamate ligands has been used to generate 11C-labelled Au(I), Au(III), Pd(II) and Pt(II) complexes in high radiochemical yields (71–99%). Labelled complexes were prepared in a rapid one-pot procedure via the substitution reaction of 11C-dithiocarbamate ligands with appropriate transition metal chloride precursors

Synthesis, Characterization and Bioactivity of Subtituted Dithiocarbazate Schiff Bases of Acetylthiophenyl Isomer and Their Metal Complexes

The condensation reaction between S-benzyldithiocarbazate (SBDTC) and S-methyldithiocarbazate (SMDTC) and acetylthiophene isomers (2- acetytthiophene and 3-acetytthiophene) to produce benzyl N-[I-(thiophen-2- yl)ethylidene] hydrazine carbodithioate (SBZATP), benzyl N-[I-(thiophen-3- yl)ethylidene] hydrazine carbodithioate (SB3ATP), methyl N-[1-(thiophen-2- yl)ethylidene] hydrazine carbodithioate (SMZATP) and methyl N-[1-(thiophen- 3-yl)ethylidene] hydrazine carbodithioate (SMZATP) has been carried out. Cobalt (II), nickel (II), copper (II), zinc (11) and cadmium (11) complexes of the synthesized Schiff bases were prepared. AH the compounds were characterized by standard physico-chemical techniques and in addition, single crystal x-ray analyses were done where possible. Antimicrobial activity and cytotoxic assays were carried out using the synthesized Schiff bases and their metal complexes. Four target microbes and four fungi were used in the antimicrobial adivtty studies and five target cancer cell lines were used for the cytotoxic assays. The SBZATP, SB3ATP, SMZATP and SM3ATP coordinate to Co(ll), Ni(l I), Cu(ll), Zn(1l) and Cd(1 I) ion as uninegatively charged bidentate ligands. All complexes are non-electrolytes in DMSO. Magnetic moments and electronic spectra show that the Cu(ll) complexes are paramagnetic compounds with distorted square planar structures while the Ni(SB2ATP)2 are diamagnetic with distorted square planar environments. The structure of SB2ATP was solved in a tridinic crystal class with a P -1 space group while the SMZATP was solved in a monoclinic crystal class and with a P 2,Ic space group. The Ni(SB2ATP)2 (monoclinic, P 2/c ) contains four-coordinated nickel(l1) in non-planar environment as a distorted square planar monomeric entity. The crystal system of Ni(SMZATP)2 is monoclinic of space group P 2&. This asymmetric unit consists of 2 molecules. The two bidentate ligands are coordinated to the nickel atom through an azomethine nitrogen and thiolo sulfur in a distorted tetrahedral environment around the nickel atom. In general, it is clearly seen that the thiophene Schiff bases and their metal complexes do not inhibit the growth of fungi except for SB2ATP and its Cu(ll) complex, which showed antifungal activity towards Candida lypolytica (2075) only. With the exception of CU(SM~ATP)w~h, ich is active against Methicillin resistant staphylococcus (MRSA), Bacillus subtilis-wild type (B29) and S. Typhimurium (S.T.), the thiophene Schiff bases and their metal complexes are inactive. It can be concluded that chelation of Cu(ll) ion increases the antifungal activity of the Schiff bases towards the target microbes. The compounds synthesized were particularly active against human breast carcinoma with positive estrogen receptor (MCF-7). However, there was only slight activlty towards the human myeloid leukemia (HL-60) cell line. The remainder of the cell lines are not responsive to the compounds

Praseodymium dithiocarbamate 1,10 phenantroline complexes

Seven promethium (Pr) complexes with 1,10-phenantroline were successfully synthesized using in situ methods from the reactions of eight amines with praseodymium(III) salts together with carbon disulphide. Methatesis and condensation were the most successful methods to prepare praseodymium dithiocarbamate 1,10-phenantroline complexes with general formula Pr[S2CNR1R2]3phen (R1 = ethyl, methyl; R2 = butyl, heptyl, isopropyl, isobutyl, benzyl and cyclohexyl; phen= 1,10-phenantroline). These complexes were characterized using elemental analysis, infrared, thermogravimetric analysis and conductivity. Microelemental analysis data were in agreement with the general formula. Infrared spectra of complexes showed the thioureide ν(C-N) bands were in the region of 1454 - 1484 cm-1 and ν(C-H) bands in the region of 2853-2973 cm-1. The single ν(C-S) bands appeared in the region of 959 – 999 cm-1 has proved to be bidentate bonding. The 13C NMR spectroscopic data for these complexes showed that the carbon signal from NCS2 moiety were in the range of 192 – 212 ppm. The crystal structure of Pr[S2CN(CH3)(C7H7)]3phen adopts triclinic system (space group Pī) with a distorted dodecahedron geometry with a = 10.7165(16) A , b = 12.2897(19) A, c = 16.586(2) A, α = 73.887(2)o, β = 74.879(2)o and γ = 71.837(2)o and Z = 2. Three dithiocarbamates and one phenanthroline ligands were coordinated to the central Pr atom in bidentate manner