Тетраамминкупрума(II) сульфат моногидрат

chembox
| verifiedrevid = 447611336
| Name = Tetraamminecopper(II) sulfate monohydrate
| ImageFile =
| ImageFile1 = CuN4aq. png
| ImageName1 = Ball and stick model of the Tetramine copper(II) cation
| ImageCaption1 = Tetraamminecopper(II) sulfate monohydrate
| ImageCaption2 = Tetraamminecopper(II) sulfate monohydrate crystals
| ImageFile2 = Copper tetrammine sulfate. jpg
| IUPACName = Tetraammineaquacopper(II) sulfate
| OtherNames = Cuprammonium(II) sulfate, Cuprammonium(II) sulfate monohydrate, Cupric sulfate, ammoniated, Tetraamminecopper(II) sulfate monohydrate
| SystematicName =
| Section1 =
| Section2 = Chembox Properties
| Formula = |[Cu(NH3)4(H2O)]SO4
| MolarMass = 245.79 g/mol (monohydrate)
| Appearance = dark blue purple solution or crystals
| Odor = Ammonia
| Density = 1.81 g/cm3
| MeltingPt =
| BoilingPtC = 330
| BoilingPt ref =
| Solubility = 18.5 g/(100 g) (21.5 °C)
|4 NH3 + CuSO4*5H2O → [Cu(NH3)4(H2O)]SO4 + 4 H2O

The deep blue crystalline solid tends to hydrolyse and evolve (release) ammonia upon standing in air. The correct concentrations of ammonia and copper(II) sulfate solution needed to synthesize the complex can be determined by colorimetry. The combination of the correct concentrations will produce the highest absorbance read out on the colorimeter and as a result the formula of the complex can be verified.

The characteristic deep blue colour of the tetraammine complex is found in brass and copper alloys where attack from ammonia has occurred, leading to cracking. The problem was first found in ammunition cartridge cases when they were stored near animal waste, which produced trace amounts of ammonia. This type of corrosion is known as season cracking.

The closely related Schweizer's reagent is used for the production of cuprammonium rayon.