Complexes copper-ethylenediamine

Nitrotetrazole is readily prepared from the diazotization of 5-aminotetrazole in the presence of excess sodium nitrite and is best isolated as the copper salt complex with ethylenediamine. The salts of 5-nitrotetrazole have attracted interest for their initiating properties. The mercury salt is a detonating primary explosive. The amine salts of 5-nitrotetrazole are reported to form useful eutectics with ammonium nitrate. ... 

REDUCTION, REAGENTS Bis(triphenyl-phosphine)copper tetrahydroborate. Borane-Pyridine. Calcium-Methylamine/ ethylenediaminc. Chlorobis(cyclopenta-dienyl)tetrahydroboratozirconium(IV). Chromium(II)-Amine complexes. Copper(0)-lsonitrile complexes. 2,2-Dihydroxy-l, 1-binaphthyl-Lithium aluminum hydride. Di-iododimethylsilane. Diisobutyl-aluminum 2,6-di-/-butylphenoxide. Diisobutyl aluminum hydride. Dimethyl sulfide-Trifluoroacetic anhydride. Disodium tetracarbonylferrate. Lithium-Ammonia. Lithium-Ethylenediamine. Lithium bronze. Lithium aluminum hydride. Lithium triethylborohydride. Potassium-Graphite. 1,3-Propanedithiol. Pyridine-Sulfur trioxide complex. 

SYNS COPPER-ETHYLENEDIAMINE COMPLEX CUPRIETHYLENE DIAMINE ... 

Reactions of Schiff bases coordinated with metal ions have been examined from the standpoint of stability and reactivity. Eichhorn (23, 25) examined the complex formed between bis-(thiaphenal)ethylene-diimine and copper(II). It was found that, when complexed to copper(II), the ligand becomes unstable and hydrolysis occurs this leads to the aldehyde and the copper-ethylenediamine complex. 

Although the hydrated copper(II) ion is readily reduced (o insoluble copper(I) iodide by iodide ion, the bis(ethyl-enediamine)copper(II) ion is not so reduced. Similarly, although water-soluble simple copper(I) salts cannot be isolated because of ready oxidation to copper (II) species, complex copper(I) species, suchas the iodocuprate(I) ions,1-3 [Cul2] and [Cul3],= are resistant to oxidation. The compound bis(ethylenediamine)copper(II) diiodocuprate(I) is thus an interesting example of stabilization of both oxidation states of copper through coordination.4... 

Complexed metal ion stabilized alkali metal polysilicates can also be used, such as copper ethylenediamine hydroxide stabilized sodium polysilicate made by mixing... 

Complexed metal ion stabilized alkali metal polysilicates can also be used, such as copper ethylenediamine hydroxide stabilized sodium polysilicate made by mixing copper ethylenediamine with colloidal silica and then the silicate, or the stabilized polysilicates of U.S. Pat. No. 3,715,224. 

Cupriethylene diamine Cupriethylenediamine solution. See Copper-ethylenediamine complex... 

Ethane, 1,2-diamino-, copper complex. See Copper-ethylenediamine complex Ethane, 1,2-dibromo. See Ethylene dibromide Ethane, 1,2-dibromotetrafluoro- Ethane, 1,2-... 

Copper-ethylenediamine complex herbicide, aquatic fish ponds Copper-ethylenediamine complex herbicide, aquatic fresh water lakes Copper-ethylenediamine complex herbicide, aquatic golf courses Copper-ethylenediamine complex herbicide, aquatic ornamentals Copper-ethylenediamine complex herbicide, aquatic potable water reservoirs Copper-ethylenediamine complex herbicide, barley Difenzoquat methyl sulfate herbicide, broadleaf, grass weeds Metamitron... 

Copper complexes with ethylenediamine (left) and methylamine (right)... 

Wang, X. and Yang, D.-S. (2006) Spectroscopy and structures of copper complexes with ethylenediamine and methyl-suhstituted derivatives. J. Phys. Chem. A, 110, 7568-7576. 

Analogs of copper-ethylenediamine solvents have been developed in which metal ions of cobalt, zinc, nickel or cadmium are used to replace copper. The cadmium analog, known as cadoxen, is colorless. Evidently, cadmium also complexes with cellulose to bring about its dissolution. ... 

There are a few documented examples of studies of ligand effects on hydrolysis reactions. Angelici et al." investigated the effect of a number of multidentate ligands on the copper(II) ion-catalysed hydrolysis of coordinated amino acid esters. The equilibrium constant for binding of the ester and the rate constant for the hydrolysis of the resulting complex both decrease in the presence of ligands. Similar conclusions have been reached by Hay and Morris, who studied the effect of ethylenediamine... 

The complexers maybe tartrate, ethylenediaminetetraacetic acid (EDTA), tetrakis(2-hydroxypropyl)ethylenediamine, nittilotriacetic acid (NTA), or some other strong chelate. Numerous proprietary stabilizers, eg, sulfur compounds, nitrogen heterocycles, and cyanides (qv) are used (2,44). These formulated baths differ ia deposition rate, ease of waste treatment, stabiHty, bath life, copper color and ductiHty, operating temperature, and component concentration. Most have been developed for specific processes all deposit nearly pure copper metal. 

C20-0045. Write the formulas of the following complex ions (a) c/s-tetraamminechloronitrocobalt(III) (b) amminetrichloroplatinate(II) (c) /rans-diaquabis(ethylenediamine)copper(II) and (d) tetrachloroferrate(ni). 

Analysis of Corexit 9527. Corexit 9527 in natural waters can be analyzed. The method is based on the formation of a Z>w(ethylenediamine) copper(II) complex, extraction of the complex into methylisobutylketone, and atomic absorption spectroscopy [1564]. The method is suitable for a concentration range of 2 to 100 mg/liter, with a precision as low as 5% relative to standard deviation for samples in the middle- to high range. Only a small sample volume (10 ml) is required. The sensitivity may be substantially increased for trace analysis by increasing the sample volume. 

Bhat et al. [199] used complexation with the bis(ethylenediamine) copper (II) cation as the basis of a method for estimating anionic surfactants in fresh estuarine and seawater samples. The complex is extracted into chloroform, and copper is measured spectrophotometrically in the extract using l,2(pyridyl azo)-2-naphthol. Using the same extraction system these workers were able to improve the detection limit of the method to 5 pg/1 (as linear alkyl sulfonic acid) in fresh estuarine and seawater samples. 

In a study published concurrently with the Evans bis(oxazoline) results, Jacobsen and co-workers (82) demonstrated that diimine complexes of Cu(I) are effective catalysts for the asymmetric aziridination of cis alkenes, Eq. 66. These authors found that salen-Cu [salen = bis(salicylidene)ethylenediamine] complexes such as 88b Cu are ineffective in the aziridination reaction, in spite of the success of these ligands in oxo-transfer reactions. Alkylation of the aryloxides provided catalysts that exhibit good selectivities but no turnover. The optimal catalyst was found to involve ligands that were capable only of bidentate coordination to copper. 

The importance of metal coordination compounds in biological systems has led to the study of polydentate Schilf base complexes of cobalt(II), nickel(II), and copper(II) (204, 205). Dimers have been observed in the spectra of complexes of both tri- and tetradentate ligands [e.g., salicylaldehydeand A,A-bis(salicylidene)ethylenediamine]. The parent ions form the base peaks, and the spectra are characterized... 

On the other hand, ligands that are very strongly held, (e.g., ethylenediamine) exert a blocking effect and reduce the reactivity. The order of reactivity of different copper(II) complexes was found to be acetate > sulfate > chloride > aquo > gly-dnate > ethylenediamine. 

Eichhom and his co-workers have thoroughly studied the kinetics of the formation and hydrolysis of polydentate Schiff bases in the presence of various cations (9, 10, 25). The reactions are complicated by a factor not found in the absence of metal ions, i.e, the formation of metal chelate complexes stabilizes the Schiff bases thermodynamically but this factor is determined by, and varies with, the central metal ion involved. In the case of bis(2-thiophenyl)-ethylenediamine, both copper (II) and nickel(II) catalyze the hydrolytic decomposition via complex formation. The nickel (I I) is the more effective catalyst from the viewpoint of the actual rate constants. However, it requires an activation energy cf 12.5 kcal., while the corresponding reaction in the copper(II) case requires only 11.3 kcal. The values for the entropies of activation were found to be —30.0 e.u. for the nickel(II) system and — 34.7 e.u. for the copper(II) system. Studies of the rate of formation of the Schiff bases and their metal complexes (25) showed that prior coordination of one of the reactants slowed down the rate of formation of the Schiff base when the other reactant was added. Although copper (more than nickel) favored the production of the Schiff bases from the viewpoint of the thermodynamics of the overall reaction, the formation reactions were slower with copper than with nickel. The rate of hydrolysis of Schiff bases with or/Zw-aminophenols is so fast that the corresponding metal complexes cannot be isolated from solutions containing water (4). 

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