Cupric Green

Chemical Designations - Synonyms Cupric Arsenite Swedish Green Scheele s Green Cupric Green Copper Orthoarsenite Chemical Formula CuHAsO ... 

Cumyl Hydroperoxide Cupric Acetate Monohydrate Cupric Arsenite Cupric Bromide, Anhydrous Cupric Chloride Dihydrate Cupric Fluoborate Solution Cupric Green Cupricin... 

SYNS ACID COPPER ARSENITE AIR-FLO GREEN ARSONIC ACID, COPPER(2+) SALT (1 1) (9CI) COPPER ARSENITE, solid pOT) CUPRIC ARSENITE CUPRIC GREEN SCHEELES GREEN SCHEELE S MNERAL SWEDISH GREEN... 

Metallic Derivatives, (a) Cuprous Acetylide. CujCg. Prepare an ammoniacal solution of cuprous chloride by first adding dilute ammonia to 2-3 ml. of dilute copper sulphate solution until the initial precipitate just redissolves and a clear deep-blue solution is obtained now add an aqueous solution of hydroxylamine hydrochloride drop by drop with shaking until the solution becomes first green and then completely colourless, the cupric salt being thus reduced to the cuprous derivative. 

Cupric chloride or copper(II) chloride [7447-39 ], CUCI2, is usually prepared by dehydration of the dihydrate at 120°C. The anhydrous product is a dehquescent, monoclinic yellow crystal that forms the blue-green orthohombic, bipyramidal dihydrate in moist air. Both products are available commercially. The dihydrate can be prepared by reaction of copper carbonate, hydroxide, or oxide and hydrochloric acid followed by crystallization. The commercial preparation uses a tower packed with copper. An aqueous solution of copper(II) chloride is circulated through the tower and chlorine gas is sparged into the bottom of the tower to effect oxidation of the copper metal. Hydrochloric acid or hydrogen chloride is used to prevent hydrolysis of the copper(II) (11,12). Copper(II) chloride is very soluble in water and soluble in methanol, ethanol, and acetone. 

Add I c.c. of a saturated alcoholic solution of cupric acetate to a few drops of the ester, a bluish-green crystalline precipitate of copper acetoacetic ester, (CoH903), Cu, is formed. See Appendix, p. 248. i . ... 

Copper salts usually are the result of corrosion in the post-boiler section and may be present as red cuprous oxide (Cu20), black cupric oxide (CuO), or blue-green copper sulfate (CuSO ). Mostly, copper salts are mixed with hematite and magnetite and take on a black color. 

Mechanistic details of this reaction are scarce, but Aratani (14) mentions that the catalyst needs to be activated by heating in the presence of the diazo compound at 75-80°C until nitrogen evolution is observed and the color of the complex changes from green to brown. Reduction of the cupric precatalyst with a substituted hydrazine results in a yellow cuprous complex capable of inducing an instantaneous decomposition of diazoacetate at ambient temperature. Aratani proposes that the active catalyst is tetrahedral Cu(I), 26 in Scheme 2. Reaction with the diazoester from the less hindered face forms the Cu carbenoid having one hemilabile ligand (al-... 

When a cupric salt is added to a polymer-ligand solution, a greenSpectroscopic study indicated that complex formation between Cu and a polymer-ligand was not a step-by-step mechanism and that the composition of the complex, Cu(ligandK, in a polymer ligand remained constant throughout the course of the reaction ( ). 

Coloring agents are used in pharmaceutical preparations for purposes of esthetics. A distinction should be made between agents that have inherent color and those that are employed as colorants. Certain agents such as sulfur (yellow), riboflavin (yellow), cupric sulfate (blue), ferrous sulfate (bluish green), and cyanocobalamin (red), have inherent color and are not thought of as pharmaceutical colorants in the usual sense of the term. 

To a saturated solution of 5.5 g. (0.028 mole) of finely powdered cupric acetate monohydrate (Note 1) in 20 riil. of a 1 1 by volume pyridine-methanol mixture (Notes 2, 3, 4, and 5) contained in a 50-ml. round-bottomed flask fitted with a reflux condenser is added 2.0 g. (0.0196 mole) of phenylacetylene (Note 6). The deep-blue suspension becomes green when heated under reflux. After 1 hour of heating, the solution is cooled (Note 7) and added dropwise to 60 ml. of 18N sulfuric add, with stirring and external cooling in an ice-salt freezing mixture (Note 8). The resulting white suspension is extracted with three 25-ml. portions of ether, and the combined ethereal extracts are washed with 15 ml. of... 

The solution is stirred slowly and ca. 25 ml. of 2N cupric chloride solution is added slowly. The blue-green color of the cupric chloride is rapidly discharged and a brick red coloration occurs, followed by the precipitation of voluminous bright red crystals of the cuprous chelate of 2,3-diazabicyclo[2.2.1]hept-2-ene. The pH is adjusted to 5-6 by the addition of 5N ammonium hydroxide. Addition of 25 ml. of the cupric chloride solution followed by neutralization of the generated hydrochloric acid with 5iV ammonium hydroxide is repeated five times. The precipitate is collected by filtration and the filtrate is again treated with 25-ml. portions of cupric chloride solution and 5N ammonium hydroxide. The procedure is repeated until the filtrate is clear red at pH 3-4 and returns to a cloudy green at pH 6 with no further formation of precipitate (Note 5). 

Copper(I) carbonate (Cu + CO Cu Oj) is known as cuprous carbonate since coppers ion is +1 copper(II) carbonate (Cu + CO — CuCO ) is known as cupric carbonate, which is also known as the green copper mineral malachite, used in pigments, as an insecticide, as a cosmetic astringent, and as a plant fungicide to prevent smut. 

When heated with abietic acid, the product is a green salt, cupric abietate, Cu(C2oH2902)2, a metal paint and fungicide. 

In a study of octopus hemocyanin (Salvato et al., 1989), a green half-methemocyanin could be formed in the presence of slight molar excess of sodium nitrite and ascorbate. This form was believed to consist of cuprous and cupric metals, but the amoung of NO directly bound was less than 0.1 mol. NOi was believed to be the oxidizing species its relationship to the endogenous ligand was not addressed. Apparently, hemocyanins are most likely to be found in deoxy, or reduced, forms, and it is difficult to oxidize them. 

A monobasic arsenious acid, OHo, conosponding to ni-trous aoid, appears to exist, one of its compounds, AsOAmo, being known. Arsenious aoid when boiled with cupric aco. tato yields SchweinfUrt green, 8A ,0,Cuo", Ou(CjH,OJ,. 

Diammino-cupric Sulphate, [Cu(NH3)2]S04, is formed when tetrammino-cupric sulphate is heated above 150° C. It is an apple-green powder, which absorbs moisture from the air and becomes blue in colour. 

Hexammino-cupric Chloride, [Cu(NH3)6]Cl2.—This salt was prepared by Faraday in ISIS by allowing ammonia gas to act upon fused cuprie chloride. Increase in bulk immediately took place and a blue powder was formed. The compound may be conveniently prepared by allowing dry ammonia to act on a solution of the cupric salt in ethyl acetate, when a green precipitate of hexammino-chloride is formed which is washed with ethyl acetate and dried.1 The same compound is obtained by the action of liquid ammonia on anhydrous cupric chloride previously saturated with ammonia gas.2... 

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