- Fungicidal and bactericidal activity of metal diethyldithiocarbamate fungicides: Synthesis and characterization
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Copper diethyldithiocarbamate, cadmium diethyldithiocarbamate, lead diethyldithiocarbamate, nickel diethyldithiocarbamate and zinc diethyldithiocarbamate have been synthesized. They have been characterized using TG, DTA, IR spectroscopy, X-ray and atomic
- Rathore,Ishratullah,Varshney,Varshney,Mojumdar
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- Eyring parameters of dehydration processes
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Thermogravimetry was used in the study of the kinetics of dehydration of MnSO4·5H2O, CuSO4·5H 2O and 3CDSO4·8H2O under static air atmosphere. The values of the kinetic and thermodynamic par
- Olszak-Humienik, Magdalena,Mozejko, Janina
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- Activation of Dioxygen and Catalytic Oxidation of Ethanol to Acetaldehyde and Hydrogen Peroxide by Copper(I) Complexes containing 2,2'-Bipyridyl and Tertiary Phosphine Ligands
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Reactions of (bipy=2,2'-bipyridyl; L=PPh3, PMePh2, PBun3, or PEt3) with O2 alone in dimethylformamide and SO2 plus O2 in dichloromethane lead to the formation of I2 and precipitation of Cu.The complex catalyses the oxidation of ethanol by dioxygen to acetaldehyde and H2O2 in the presence of equimolar quantities of Na.Added phosphine acts as a strong inhibitor and the catalytic decomposition of H2O2 by the complexes leads to their deactivation.A tentative reaction mechanism is discussed.
- Bhaduri, Sumit,Sapre, Niteen Y.
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- Kinetic study and mechanism of chalcocite and covellite oxidation process
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Results of the experimental investigation of the copper natural sulfide minerals (chalcocite and covellite) oxidation process in the air atmosphere are presented in this paper. Based on data obtained using thermal analysis methods and by construction of P
- ?ivkovi?,?trbac, Nada,?ivkovi?, Dragana,Velinovski,Mihajlovi?
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- Synthesis, structural characterisation and thermal decomposition of a new organic-inorganic hybrid material (C5H14N2)[Cu(SO4)2(H2O)4] · H2O
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The crystal structure of copper sulfate templated by 2-methylpiperazine, (C5H14N2)[Cu(SO4)2(H2O)4] · H2O, was investigated using single crystal X-ray diffraction data.
- Hajlaoui, Fadhel,Yahyaoui, Samia,Na?li, Houcine,Mhiri, Tahar,Bataille, Thierry
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- Vibrational spectra of copper sulfate hydrates investigated with low-temperature raman spectroscopy and terahertz time domain spectroscopy
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In this paper, the vibrational spectra of copper sulfate hydrates (CuSO4xH2O, x = 5, 3, 1, 0) have been investigated with low-temperature Raman spectroscopy and terahertz time domain spectroscopy (THz-TDS). It is found that the four groups of Raman bands between 90 and 4000 cm-1 can be assigned to lattice vibration as well as intramolecular vibrations of a copper complex, sulfate group, and water molecules. The variation of vibrational spectra during the dehydrated process are discussed in detail considering the transformation of the crystal structure, especially the bands between 3000 and 3500 cm-1, which are attributed to the v 1 and v3 modes of water molecules. In addition, as a complement of Raman spectra, the THz spectra at 0.1-3 THz indicate the absorption due to the low-frequency lattice vibration and hydrogen bond.
- Fu, Xiaojian,Yang, Guang,Sun, Jingbo,Zhou, Ji
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- Thermobalance for teaching purposes
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A thermobalance for teaching purposes was constructed which is able to measure simultaneously the mass and temperature of a sample. The effectiveness of the device is discussed by the TGA curves of the evaporation of acetone, the dehydration of copper sul
- Wiederholt,Fahrney,Skrozki
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- Role of liquid water in crystalline hydrate dehydration. Copper sulphate pentahydrate
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Simultaneous Differential Thermal Analysis/Thermogravimetric experiments carried out on one large single crystal, several small single crystals and powdered crystals of pentahydrate copper sulphate have been used to demonstrate the role that retained liquid water plays in maintaining crystal morphology during dehydration. Measured activation energies for stepwise dehydration in the system show the presence of solution-based transformations provide lower energy paths for the dehydration steps and stress relieving mechanisms. Skeletal anhydrous crystals from large-sized pentahydrate copper sulphate have the same morphology as the starting crystal on complete dehydration at controlled heating rates as long as a solution phase is maintained within the crystal during decomposition. The athermal activation energies, in this work, are in agreement with those obtained by isothermal methods as long as coincident reaction paths for the two techniques are maintained. The literature has been reviewed in the light of this work and a three-stage process is presented to rationalise the conflicting obtained by workers using a variety of different experimental techniques.
- De Castelnuovo,Harness,McColm
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- Intracrystalline Site Preference of Hydrogen Isotopes in the Water of Crystallization of Copper Sulfate Pentahydrate
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Difference in the isotopic partition at the water of crystallization of CuSO4*5H20 (the site preference) was estimated for the hydrogen isotopes.Fractional dehydration of CuSO4*5H2O under vacuum at 0 and 25 deg C was used to determine the isotopic ratio, the amount of dehydrated water, and the rate process of dehydration.The following results were obtained. (1) Two maxima occur in the isotopic ratio in the dehydration range, FA) and one bonded to the sulfate ion through hydrogen bonding (site B) was made.The site preference of hydrogen isotopes (δD.) was concluded to be -32.0+/-5.2 for site A and +22.6+/-20.9 for site B, where the δD value was referred to the isotopic ratio of the mother liquor from which the crystal formed.
- Kita, Itsuro,Matsuo, Sadao
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- Kinetics of salt roasting of chalcopyrite using KCl
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The process of salt roasting appears to be very promising because it lowers the reaction temperature and leads to water soluble chloride salt. This paper presents the kinetics of salt roasting of chalcopyrite using KCl as the chlorinating agent. Isothermal thermogravimetric studies were carded out in the temperature range of 523-773 K under oxygen, static air and argon atmospheres. It is observed that the weight gain is more in the presence of oxygen than in static air. Weight loss is observed when salt roasting is carried out under an inert atmosphere. It is deduced that the reaction is chemically controlled at temperatures below 600 K both under static air and oxygen atmosphere. At higher temperatures, the process is not thermally activated. The weight gain decreases with increase in temperature because of a change in the chemistry of the process. The roasting experiments carried out in a horizontal electric tube furnace under an oxygen atmosphere shows that up to 96% Cu can be recovered from the chalcopyrite by salt roasting with KCl and subsequent water leaching. (C) 2000 Elsevier Science B.V.
- Chakravortty,Srikanth
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- Synthesis, crystal structure and fluorescent property of two-dimensional Cu(I) coordination polymers with cyanide, thiocyanate and triazole bridges
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Hydrothermal reaction of CuCN, K3[Fe(CN)6] with 4-(6-amino-2-pyridyl)-1,2,4-triazole (apt) afforded a coordination polymer [Cu7(CN)7(apt)2]n (1), while solvothermal reaction of CuSCN with apt in acetonitrile afforded a coordination polymer [Cu2(SCN)2(apt)]n (2). Complex 1 shows two-dimensional polymeric network with large hexagonal channels constructing by CuCN chains and tridentate apt ligands. Complex 2 shows two-dimensional polymeric framework assembled by ladder-like [Cu(SCN)]n chains and bidentate apt ligands, in which thiocyanate acts as a tridentate bridging ligand. Both polymers are thermal stable and strong fluorescent in the solid state.
- Liang, Sheng-Wen,Li, Ming-Xing,Shao, Min,He, Xiang
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- Isocyanide-Induced Activation of Copper Sulfate: Direct Access to Functionalized Heteroarene Sulfonic Esters
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A novel and direct approach to alkyl/aryl heteroarene sulfonic esters using copper sulfate as the environmentally benign inorganic sulfonation reagent was first realized with the aid of isocyanide. A variety of heterocycles reacted to afford the corresponding sulfonic esters through C?H functionalization. In this transformation, the otherwise inert copper sulfate was unusually activated by an isocyanide and employed as the source of the sulfonic substituents in an unprecedented fashion. The findings suggest that an appropriate activator may liberate the chemical activities of some relatively inert inorganic salts for organic synthesis.
- Hong, Xiaohu,Tan, Qitao,Liu, Bingxin,Xu, Bin
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supporting information
p. 3961 - 3965
(2017/03/27)
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- Polypeptides Having Peroxygenase Activity and Polynucleotides Encoding Same
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The present invention relates to isolated polypeptides having peroxygenase activity, and polynucleotides encoding the polypeptides. The invention also relates to nucleic acid constructs, vectors, and host cells comprising the polynucleotides as well as methods of producing and using the polypeptides.
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- CuS nanostructures prepared by a hydrothermal method
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Without using any surfactant or template, novel CuS three-dimensional (3D) structures consisting of nanosheets were successfully synthesized via a convenient one-step hydrothermal approach. X-ray diffraction pattern showed that the as-prepared product was pure hexagonal phase CuS. Scanning electron microscopy and high-resolution transmission electron microscopy images revealed that the as-prepared product comprised 3D microspheres (about 1-3 μm in diameter), which were further constructed with randomly oriented, single-crystalline CuS nanosheets (about 20 nm in thickness). The UV-vis absorption spectrum of the as-synthesized CuS 3D microspheres displayed an optical absorption minimum near 672 nm. Besides, the thermal stability of the as-synthesized CuS 3D microspheres was also studied.
- Huang, Qing-Li,Chen, Hu,Zhang, Yong Cai,Le Wu, Chang
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p. 6382 - 6387
(2011/08/05)
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- Hydrogenation Process and High Monoene Compositions Obtained Therefrom
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A hydrogenation process for producing high monoene compositions is disclosed. In particular, a catalyst comprising basic copper carbonate is used for the selective hydrogenation of oils that contain unsaturated fatty acyl components such as unsaturated vegetable oils. Hydrogenation according to the methods of the invention yield high monoene compositions that are useful for industrial applications, such as lubricants.
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Page/Page column 7-8
(2008/06/13)
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- Spectral and thermal studies on new hydrazinium metal sulfite dihydrates
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Some new hydrazinium transition metal sulfite dihydrate complexes of the formula (N2H5)2M(SO3) 2(H2O)2 where M=Fe, Co, Ni, Cu and Zn have been prepared and characterized by hydra
- Vikram,Shanthakumar,Ragul,Sivasankar
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p. 521 - 524
(2008/10/09)
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- Synthesis and characterization of norfloxacin-transition metal complexes (group 11, IB): Spectroscopic, thermal, kinetic measurements and biological activity
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The investigation of the new structures of Ag(I), Cu(II) and Au(III) complexes, [Ag2(Nor)2](NO3)2, [Cu(Nor)2(H2O)2]SO4·5H2O and [Au(Nor)2 (H2O)2]Cl3 (where, Nor = norfloxacin) was done during the reaction of silver(I), copper(II) and gold(III) ions with norfloxacin drug ligand. Elemental analysis of CHN, infrared, electronic, 1H NMR and mass spectra, as well as thermo gravimetric analysis (TG and DTG) and conductivity measurements have been used to characterize the isolated complexes. The powder XRD studies confirm the amorphous nature of the complexes. The norfloxacin ligand is coordinated to Ag(I) and Au(III) ions as a neutral monodentate chelating through the N atom of piperidyl ring, but the copper(II) complex is coordinated through the carbonyl oxygen atom (quinolone group) and the oxygen atom of the carboxylic group. The norfloxacin and their metal complexes have been biologically tested, which resulted in norfloxacin complexes showing moderate activity against the gram positive and gram negative bacteria as well as against fungi.
- Refat, Moamen S.
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p. 1393 - 1405
(2008/09/17)
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- Method for storing tumor cells
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The present invention relates to a method for storing cells, wherein the cells are stored in a composition comprising a base nutritive medium and liposomes at temperatures in the range of -196°C to 37°C, characterized in that the liposomes comprise one or more sterols and that the cells are tumor cells. More specifically, the invention relates to simple and effective methods for storing tumor cells, wherein the RNA and/or DNA in the cells is essentially not degraded, such that the RNA and/or DNA can be analzed after storage.
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- Liposome loading with metal ions
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This invention relates to encapsulation of drugs and other agents into liposomes.
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- Magnetic structure and properties of Cu3(OH)4SO 4 made of triple chains of spins s=1/2
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Cu3(OH)4SO4, obtained by hydrothermal synthesis from copper sulfate and soda in aqueous medium, is isostructural with the corresponding antlerite mineral, orthorhombic, space group Pnma (62), with a=8.289(1) b=6.079(1) and c=12.057(1)A, V=607.5(2) A3, Z=4. Its crystalline structure has been refined from X-ray single crystal and powder neutron diffraction data at room temperature. It consists of copper (II) triple chains, running in the b-axis direction and connected to each other by sulfate groups. The magnetic structure, solved from powder neutron diffraction data at 1.4K below the transition at 5K evidenced by susceptibility and specific measurements, reveals that, inside a triple chain, the magnetic moments of the copper ions (μB=0.88(5) at 1.4K) belonging to outer chains are oriented along the c-axis of the nuclear cell, with ferromagnetic order inside a chain and antiferromagnetic order between the two outer chains. No long-range magnetic order is obtained along the central chain with an idle spin behavior.
- Vilminot,Richard-Plouet,Andre,Swierczynski,Guillot,Bouree-Vigneron,Drillon
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p. 255 - 264
(2008/10/08)
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- Preparation and crystal structure of copper(I) carbonyl hydrogensulfate, obtained by carbonylation in sulphuric acid
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The hydrogensulfato-carbonyl derivative [Cu(CO)(SO4H)]n, as obtained from the Cu2O/ H2SO4/CO system and recrystallized from H2SO4/(CH3O)2SO2 has been shown to possess a crystal structure organised in infinite chains built up by corner sharing of {CuO3(CO)} and {S(OH)O3} tetrahedra. The chains are connected by hydrogen bonds in layers, with CO groups leaning out on both sides. The absorption of CO by CuSO4/Cu or by Cu2O in sulfuric acid was quantified as a function of concentration. The CuSO4/Cu system in water absorbs carbon monoxide (CO/Cu molar ratio = 1.0).
- Dell'Amico, Daniela Belli,Calderazzo, Fausto,Labella, Luca,Lorenzini, Fabio,Marchetti, Fabio
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p. 1868 - 1872
(2008/10/08)
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- Thermoanalytical studies on copper-iron sulphides
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The direct production of copper sulphate from copper ore is an important route to recover copper. The condition, however, is dependent on temperature and sulphatising environment. The oxidation of chalcopyrite in static air bed condition has been studied by TG/DTA and DSC techniques. The addition of catalysts, improved the sulphation by in-situ producing better conditions. The mutual effects of sulphides were further confirmed by studying the oxidation reaction on pure copper-iron sulphides and results so obtained were corroborated with X-ray diffractrograms. With only chalcopyrite a mass gain of 8% (TG) corresponding to copper sulphate formation was observed, in the temperature range 628-738 K. The TG plots showed respective mass gain of 14, 17 and 12% in presence of Fe2O3, Na2SO4 and FeSO4 with chalcopyrite in the wider temperature range 628-923 K. As such the cupric sulphide had a negligible tendency of sulphation, which increased with the addition of ferrous sulphide mixture under the temperature range studied. At higher temperature copper ferrite formation was found.
- Prasad,Pandey
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p. 625 - 637
(2008/10/09)
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- Stability and reactivity of coordination and inclusion compounds in the reversible processes of thermal dissociation
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The thermoanalytical approach to the study of the kinetic lability of coordination and inclusion compounds in the reversible processes of thermal dissociation is discussed. The secondary crystal structure that existed initially and its transformation into the reaction zone on the surface of the grain are considered. It is pointed out that in any experiment the measured decomposition rate is averaged over all crystal faces. Kinetic data can be interpreted in terms of the transformation mechanism only for a series of isostructural compounds. The author's own experimental data on thermal dissociation processes for coordination and inclusion compounds are presented and considered.
- Logvinenko
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p. 293 - 299
(2008/10/09)
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- Molten sodium nitrite-sodium nitrate-potassium nitrate eutectic: The reactions and spectra of iron(III), cobalt(II), nickel(II) and copper(II) compounds
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In the sodium nitrite sodium nitrate-potassium nitrate ternary eutectic, iron(III), cobalt(II) and nickel(II) chlorides were found to undergo Lux Flood acid base reactions to form their most stable oxides, which were insoluble, while copper(II) sulphate reacted to form a basic nitrate. The stoichiometry of the reactions in the presence of the competing basic anions was much more similar to those found in pure nitrite than in pure nitrate melts, but the oxidation of nitrite to nitrate, possibly via nitric oxide and nitrogen dioxide, was shown to be important. The green solution of nickel(II) chloride had a spectrum which was much more similar to that in pure nitrite than in pure nitrate melts. Octahedral coordination by nitro, nitrito and nitrato ligands is suggested, in the ratio 2:1:3.
- Eweka,Kerridge
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p. 133 - 138
(2008/10/09)
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- Quantitative determination of phases present in oxidised chalcocite
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A sample of chalcocite (Cu2S) of particle size 45-75 μm was heated in air at 10°C min-1 in a simultaneous TG-DTA apparatus. The phase compositions of the products at various temperatures were quantitatively determined by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and wet chemical analyses. Copper(II) sulfate, of amount 1.7% by mass, was observed at 435°C and increased rapidly in concentration to 56% at 570°C. From 570-670°C, there was a rapid decrease in CuSO4 content to 9.8% as the phase converted to CuSO4·CuO, with the CuSO4 not being detected at 775°C. From 435-570°C, Cu2O formed, but at a rather slower rate, reaching 47% at 570°C. The Cu2O level then decreased to 38% over the range 570-670°C. CuSO4·CuO was first detected at 570°C by FTIR, although it was not detected by XRD at this temperature. The content of this species reached 41% at 670°C, decreased to 24% at 775°C, and was not detected at 840°C. CuO first appeared at 670°C and rose steadily in concentration until at 840°C it was the only compound present.
- Dunn,Ginting,O'Connor
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- Production of polysulfides
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A process for preparing a stabilized and deodorized organic polysulfide compound is provided which comprises contacting a crude polysulfide, in the presence of a solvent, optionally further in the presence of a basic compound, with a metal salt of an inorganic acid or a metal salt of an organic acid under conditions sufficient to produce the stabilized and deodorized polysulfide.
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- Cu//2SO//2 PHASE: ITS PREPARATION AND SOME PROPERTIES.
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The conditions of synthesis of the Cu//2SO//2 phase, its thermal characteristics and its reactivity with respect to some other phases occurring in the Cu-S-O system below 710 K, at P//S//O//2 equals 101 kPa, have been given. It has been established that the phase undergoes two reversible solid-state transitions, melts without decomposition at 610 K, and in the liquid state is stable up to 680 K. It is pointed out that Cu//2SO//2 is a phase thermally more stable than Cu//2SO//4.
- Debinski, H.,Walczak, J.
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- Kinetic Stability of Tetrazaporphin Complexes in Aqueous Sulphuric Acid
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The solvoprotolytic dissociation of metal complexes of tetrazaporphin in aqueous sulphuric acid has been shown to be first-order with respect to both the complex and the concentration of oxonium ions.A mechanism for the solvoprotolytic dissociation of the metal complexes of tetrazaporphin in sulphuric acid is proposed.The stabilities of metal tetrazaporphyrins and metal phthalocyanines in aqueous sulphuric acid are compared.
- Khelevina, O. G.,Stuzhin, P. A.,Berezin, B. D.
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p. 1131 - 1134
(2007/10/02)
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- Imidazole-copper complex compounds and fungicides containing them
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New imidazole-copper complex compounds having a good fungicidal action, fungicides containing these compounds as active ingredients, processes for their manufacture, and their use for combating fungi.
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- Process for the purification of crude polyhalo copper phthalocyanines
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Polyhalo copper phthalocyanines are purified in concentrated sulfuric acid under addition of peroxo compounds including addition compounds of hydrogen peroxide. The products are useful as pigments having very pure green shades and good fastness properties.
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- ACTION OF SULFUR TRIOXIDE ON CHALCOPYRITE.
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SO//3 reacts with chalcopyrite at about 100 degree C to form water soluble sulfates and SO//2. SO//3 containing about 4% O//2 reacts more rapidly than SO//3 alone at that temperature apparently due to the complete transformation of FeSO//4 into ferric sulfate in an extremely porous form. A stoichiometric mixture of SO//2 plus one-half O//2 behaves towards chalcopyrite in nearly the same way as SO//3 although only in the temperature range 350 degree to 700 degree C.
- Habashi,Dugdale
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p. 1553 - 1556
(2008/10/08)
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