Reaction Of Copper Acetate Research Articles

Syntheses and crystal structures of copper mixed-ligand complexes of multidentate enaminones and acetate anions

Reactions of ferrocenoylacetone with 2-(aminomethyl)pyridine and N-(2-hydroxyethyl)-1,2-diaminoethane afford the multidentate enaminones H L 1 and H 3 L 2, respectively. Reactions of copper acetate with the two enaminones generate the corresponding mixed-ligand complexes I and II, which are formulated as [Cu L 1(OAc)] and [Cu(H 2 L 2)(OAc)], respectively. The structures of H L 1, I and II have been determined by single-crystal X-ray crystallography. In complex I, H L 1 acts as a monoanionic tridentate donor via the carbonyl oxygen, deprotonated enamine nitrogen and pyridyl nitrogen atoms, the acetate anion is monodentate and the coordination geometry of the central metal is square planar. In complex II, H 3 L 2 is a monoanionic tetradentate ligand via the carbonyl oxygen, deprotonated enamine nitrogen, secondary amine nitrogen and hydroxy oxygen atoms, the acetate anion is monodentate and the coordination geometry of the central metal is a distorted trigonal bipyramid.

Hydrolytic ring opening reactions of anhydrides for first row transition metal dicarboxylate complexes

Ring opening reactions of 2,3-pyridine dicarboxylic anhydride are studied with hydrated salts of cobalt, nickel and zinc. The hydrated metal salts preferentially hydrolyze 2,3-pyridine dicarboxylic anhydride rather than causing esterification in methanol medium. Hydrolytic opening of 2,3-pyridine dicarboxylic anhydride by hydrated cobalt(II) acetate and nickel(II) acetate resulted in the corresponding chelate complexes of monodeprotonated 2,3-pyridine dicarboxylic acid. The reaction of copper acetate with pyromellitic dianhydride in the presence of 1,10-phenanthroline gives a dinuclear copper complex whereas a similar reaction with copper(II) chloride gives a mononuclear copper complex.

Structure and Magnetic Property of an Octadecanuclear Cu(II) Complex

Abstract A reaction of copper acetate with a phosphate salt of pentadentate ligand yielded octadecanuclear complex, [Cu18(Hbeamp)6(PO4)8]·C3H7OH·24H2O (H3beamp = 2,6-bis[N-(2-hydroxyethyl)aminomethyl]-4-methylphenol), in which Cu(II) ions were bridged by alkoxo, phenoxo, and phosphate groups. Magnetic susceptibility measurements revealed the presence of antiferromagnetic interaction through bridges.

Synthesis, characterization and crystal structure of a monomeric and a macrocyclic copper (II) complex with a large cavity using benzylacetylacetone ligand

The bidentate ligand benzylacetylacetone was used to synthesize the Cu(II) complexes 1 and 2 without and with 4,4 ′-bipyridine ligand, respectively. The complexes were characterized by analytical and spectroscopic studies. The mononuclear complex [Cu(C 10H 9O 2) 2] ( 1) has been synthesized by the reaction of copper acetate with the ligand whereas the tetranuclear complex [Cu 4(4,4 ′-bpy) 4(C 10H 9O 2) 4(C 2H 3O 2) 4] ( 2) has been synthesized by the reaction of copper acetate with the ligand followed by the addition of 4,4 ′-bipyridine. The X-ray analysis shows that the complex 1 has square planar geometry and the complex 2 has square pyramidal geometry around the metal centers. The thermogravimetric studies showed that the complexes undergo decomposition in multiple steps.

Sonochemical synthesis of copper selenides nanocrystals with different phases

A series of copper selenides (Cu 2− x Se, Cu 3Se 2 and CuSe) nanocrystals were prepared by a sonochemical method based on the reaction of copper acetate and sodium selenosulfate in an aqueous system. The phases and sizes of the nanocrystals could be controlled by changing the ratio of [Cu 2+]/[SeSO 3 2−] and complexing agents. X-ray powder diffraction and transmission electron microscopy were used to determine the phase, purity, size and morphology of the products.

Determination of free fatty acids in foods by flow injection

AbstractA flow injection manifold has been developed for the spectrophotometric determination of free fatty acids (FFA) at 716 nm after continuous extraction into an organic phase of soaps formed by the reaction of copper acetate with the analytes. The carrier system stream was toluene and the reagent stream aqueous copper acetate‐pyridine (50 g litre−1). The calibration graph was linear over the range 1 × 10−4 to 5 × 10−3 M oleic acid using an injection volume of 115 μl. The injection rate was 75 samples h−1 with a precision of 109% (RSD). Though this procedure does not permit the total recovery of short‐chain fatty acids it is very effective in reflecting the total concentration of FFA. The system has been applied to the determination of total FFA in olive oil, milk fat and cocoa butter. Although the values obtained by the proposed method are lower than those obtained by the reference method (titration) and by chromatography, their comparison shows good linearity.

Cu(II) complexation of sulfanilamide derivatives

Cu(II) salts produce coloured compounds with sulfanilamides. InPh. Ned. VIII (derived fromPh. Eur. 1) two modifications of this reaction are applied for identification purposes of sulfanilamides, namely: 1. the reaction of copper sulphate in alkaline medium and 2. the reaction of copper acetate in methanolic solution.