Synthesis of tetraamminecopper(II) sulfate

Preparation of tetraamminecopper(II) sulfate monohydrate

The tetraamminecopper sulfate is exceedingly soluble in water, and therefore, in preparing it,  ethyl alcohol is used to decrease the solubility. The method adopted of allowing the alcohol to mix with the aqueous solution by slow diffusion is to ensure the formation of large, well-defined crystals.

25 grams of pulverized copper sulfate are dissolved in the 85 ml of cold 6 N (~10%) ammonium hydroxide solution. The obtained solution is filtered in order to remove any insoluble particles. 125 ml of ethyl alcohol are placed in the flask. The stem of the dropping funnel is filled with water, which is inserted in the flask with alcohol and reaches the bottom of the alcohol. 20 ml of water are passed to form a layer beneath the alcohol and to this water layer the ammoniacal copper solution is introduced through the funnel. No bubbles of air are allowed to be sucked with the liquid into the stem of the funnel, furthermore, stirring the solution and mixing the layers should be avoided too. Then the flask is left for at least a week, at the end of which time crystals 2 or 3 cm long will form. The alcoholic and aqueous layers have not yet completely diffused into each other, and when they are mixed, a meal of very small crystals is precipitated. Therefore, the liquid is poured all at once out of the flask into a clean beaker. The large crystals adhere to the inside of the flask, which are removed to a small dish, treated with 10 ml of alcohol to which 1 ml of ammonia has been added,  stirred thoroughly by rotating the dish, and the alcohol is poured off, allowing it to carry with it any of the precipitate of small crystals. The washing is repeated with 10 ml of alcohol and then with 10 ml of ether. The obtained crystals of tetraamminecopper sulfate are spread on paper towels and left until they cease to smell of ether. Then at once the crystals are transferred in a stoppered bottle since they give off their ammonia rather easily. The crystal meal formed in the beaker are filtered and washed on the filter with alcohol to which ammonia has been added and then with alcohol and finally with ether. The obtained meal of tetraamminecopper sulfate is transferred in a stoppered bottle.

Synthetic inorganic chemistry, by A. A. Blanchard, 227-228, 1936

IUPAC Name

copper;azane;sulfate;hydrate

InChI

InChI=1S/Cu.4H3N.H2O4S.H2O/c;;;;;1-5(2,3)4;/h;4*1H3;(H2,1,2,3,4);1H2/q+2;;;;;;/p-2

InChI Key

ABAHXVHZPFQSDZ-UHFFFAOYSA-L

Canonical SMILES

N.N.N.N.O.[O-]S(=O)(=O)[O-].[Cu+2]

Depositor-Supplied Synonyms

UNII-5NKQ44K2RN, 10380-29-7, Cupric sulfate, ammoniated, AC1L1VE2, copper azane sulfate hydrate, 5NKQ44K2RN, Ammoniated cupric sulfate, monohydrate, AKOS015913758, copper(2+) ion tetraamine hydrate sulfate, 3B4-4564, I14-44854, Copper(2+), tetraammine-, sulfate (1:1), monohydrate

Removed Synonyms

CID61513, Tetraamminecopper(II) sulfate monohydrate

IUPAC Name

copper;azane

InChI

InChI=1S/Cu.4H3N/h;4*1H3/q+2;;;;

InChI Key

QKSIFUGZHOUETI-UHFFFAOYSA-N

Canonical SMILES

N.N.N.N.[Cu+2]

Depositor-Supplied Synonyms

Tetramine copper, Cupriammonia, Copper tetrammine, Copper tetraammine, Tetraamminecopper(II), Tetraaminecopper(2+), Tetraamminecopper(II) ion, Copper(2+), tetraammine-, Copper(2+), tetraammine-, ion, Copper in the form of an ammonia complex, 16828-95-8, copper ammonia, copper azane, Copper tetraamine, AC1L1W0S, Copper(2+), tetraammine- (9CI), LS-54930

Removed Synonyms

CID61847

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