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On the Mechanism of Cleavage of Thioacetals Promoted by Copper(II) Sulphate Adsorbed on Silica Gel G erardo M. Caballero*, E duardo G. G ros Departamento de Qirimica Orgänica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellön 2, Ciudad Universitaria, 1428 Buenos Aires, Argentina Z. Naturforsch. 52b, 1147-1151 (1997); received June 6, 1997 Thioacetats, Copper(II) Sulphate A probable mechanism of the cleavage reaction of thioacetals by copper(II) sulphate ad­ sorbed on silica gel involves: formation of a chelate between sulphur

Synthesis of inorganic oxide composites with the use of postgalvanic waste solutions of copper(II) sulfate

The study was undertaken to obtain an oxide composite (inorganic colourful pigment) in the method based on the use of postgalvanic waste solution of copper(II) sulfate. The conditions of the process of precipitation of synthetic CuOSiO2 were optimised by checking the effect of the concentration and the volume ratio of the reagents and the temperature on the physico-chemical parameters of the final product. The oxide composite obtained in the optimum conditions was characterised by high refinement of particles and large specific surface area BET of 326 m2/g.

sulfates and the complex Cu sulfates. Raman spectroscopy of basic copper(II) and some complex copper(II) sulfate minerals: Implications for hydrogen bonding RAY L. FROST,1,* PETER A. WILLIAMS,2 WAYDE MARTENS,1 PETER LEVERETT,2 AND J. THEO KLOPROGGE1 1 Inorganic Materials Research Program, Queensland University of Technology, GPO Box 2434, Brisbane Queensland 4001, Australia 2 School of Science, Food and Horticulture, University of Western Sydney, Locked Bag 1797, Penrith South DC NSW 1797, Australia * E-mail: r.frost@qut.edu.au tite and

Crystal structure of aquabis(3,5-dimethylpyrazolyl)copper(II) sulfate hydrate, [Cu(H2O)(C5H8N2)2][SO4] · 2H2O Su-Qing Wang and Fang-Fang Jian* Weifang University, Microscale Science Institute, Department of Chemistry and Chemical Engineering, Weifang 261061, Shandong, P. R. China Received May 10, 2010, accepted and available on-line September 1, 2010; CCDC no. 1267/3059 Abstract C10H22CuN4O7S, monoclinic, P21/m (no. 11), a = 4.865(1) Å, b = 21.101(4) Å, c = 8.072(2) Å, * = 96.05(3)°, V = 823.9 Å3, Z = 2, Rgt(F) = 0.036, wRref(F2) = 0.116, T = 293 K. Source of

Abstract

C24H28CuN10O9S, monoclinic, P21/c (no. 14), a = 16.3499(16) Å, b = 14.0411(13) Å, c = 12.7069(13) Å, β = 104.019(2)°, V = 2830.2(5) Å3, Z = 4, R gt(F) = 0.0472, wR ref(F 2) = 0.1165, T = 293(2) K.

Über die Umsetzung von Kupfersulfat mit Carbonsäuren und Carbonsäurederivaten in wäßrigen Lösungen unter hydrothermalen Bedingungen The Reaction of Copper Sulfate with Carboxylic Acids and their Derivatives in Aqueous Solutions under Hydrothermal Conditions F. Seel* und J. Schuh Fachrichtung Anorganische Chemie der Universität des Saarlandes. D-6600 Saarbrücken Z . Naturforsch. 42b, 157-162 (1987); eingegangen a m 19. September 1986 Copper, Copper(II) Sulfate, Carboxylic Acids, Hydrothermal Reactions Under hydrothermal conditions aqueous solutions of

Abstract

Simple iron gall inks composed of gallic acid, ferrous sulfate, and gum arabic and in some cases also of copper(II) sulfate were prepared. The process of iron ion complex formation with gallic acid was investigated using UV-VIS spectroscopy, pH measurements, and by monitoring the concentration changes of Fe(II) ions. The admixture of Fe(II) ions to gallic acid induced a bathochromic shift of absorption bands at 215 nm and 265 nm in the UV-VIS spectra. Formation of a new absorbance band in the visible area was also observed and used to calculate the initial rate of complex formation. Concurrently, the pH values and the concentration of Fe(II) ions in the solution decreased. Gum arabic significantly enhanced the complex formation and its stability. On the contrary, the addition of Cu(II) ions to the solution decelerated the complex formation considerably.

, Rebecca Pogni4 and Marko Petrič1 1 University of Ljubljana, Biotechnical Faculty, Department of Wood Science & Technology, Ljubljana, Slovenia 2 Institute Jozef Stefan, Ljubljana, Slovenia 3 University of Ljubljana, Faculty of Chemistry, Department of Analytical Chemistry, Ljubljana, Slovenia 4 University of Siena, Department of Chemistry, Siena, Italy Summary Various aqueous wood preservative solutions containing Cu(II) in the form of copper(II) sulphate or copper(II) octanoate, ethanolamine and in one case octanoic acid were investigated by spec- trophotometry

copper was examined. For this purpose, we impregnated Norway spruce (Picea abies) specimens with two different aqueous solutions: copper(II) octanoate with ethanolamine or copper(II) sulfate (cCu = 1.06 10-2 mol/l). Impregnated and unimpregnated test specimens were then exposed to brown rot fungi Antrodia vaillantii and Gloeophyllum trabeum or to white-rot fungi Schizophyllum commune and Trametes versicolor. After 2, 4, 6 and 12 weeks of exposure Electron Paramagnetic Resonance, Atomic Absorption Spectroscopy and mass loss mea- surements were performed. The results

Hydrothermal Synthesis and Structure of Two 1-D Organic Hybrid Metal Sulfates Xing Liu, Jian Zhou, Feilong Hu, Weijin Yuan, and Zhiwei Huang College of Chemistry and Material, Yulin Normal University, Yulin 537000, P. R. China Reprint requests to Prof. Dr. Jian Zhou. E-mail: Jianzhou888888@163.com Z. Naturforsch. 2011, 66b, 1127 – 1130; received October 2, 2011 Two new complex copper(II) sulfates [Cu(1,10-phen)(H2O)2]SO4 (1, 1,10-phen = 1,10-phenanthr- oline) and [Cu(2,2′-bipy)(H2O)2]SO4 (2, 2,2′-bipy = 2,2′-bipyridine) have been hydrothermally syn- thesized and