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Tetramminecopper(II) sulfate IUPAC name Tetraamminecopper(II) sulfate monohydrate Other names cuprammonium(II) sulfate; cupric sulfate, ammoniated Identifiers CAS number 14283-05-7 PubChem 61513 Properties Molecular formula [Cu(NH3)4(H2O)n]SO4 Molar mass 245.79 g/mol Appearance dark blue-purple solution or crystals  Y(what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references Tetramminecopper(II) sulfate is the inorganic compound with the formula [Cu(NH3)4(H2O)n]SO4. This dark blue solid is a metal complex. It is closely related to Schweizer's reagent, which is useful in the production of cellulose fibres in the production of rayon. Preparation, structure, properties This compound can be prepared by treating concentrated ammonia solution, NH3, to a saturated aqueous solution of copper sulfate [Cu(H2O)6]SO4 until all the copper(II) hydroxide that is initially formed redissolves into a deep blue solution. The deep blue crystalline solid tends to hydrolyse and lose ammonia ligands upon standing in air. In the solid state, the salt consists of the [Cu(NH3)4H2O]2+ cation, which has a square pyramidal molecular geometry. The Cu-N and Cu-O distances are about 210 and 233 pm.[1] A container containing an ammonia solution of tetramminecopper(II) sulfate References ^ Morosin "The crystal structures of copper tetrammine complexes. A. Cu(NH3)4SO2.H2O and Cu(NH3)4SeO4" Acta Cryst. (1969). B25, 19-30 doi:10.1107/S0567740869001725 External links National Pollutant Inventory - Copper and compounds fact sheet Material Safety Data Sheet (MSDS) This inorganic compound-related article is a stub. You can help Wikipedia by expanding it.v · d · e