Schweizer's reagent

Schweizer's reagent

Schweizer's reagent is the common name for the complex tetra-aminecopper dihydroxide, [Cu(NH3)4] [OH] 2. It is prepared by precipitating copper(II) hydroxide from an aqueous solution of copper sulfate using sodium hydroxide, then dissolving the precipitate in a solution of ammonium hydroxide. It forms a deep azure solution. If the solution is evaporated, it leaves blue, needle-like crystals.

Schweizer's reagent finds use in production of cellulose products such as rayon and cellophane, because wood-pulp, cotton fiber, and other natural cellulose sources are soluble in the solution. Dissolved cellulose precipitates when the solution is acidified.

References

*cite journal
author = Walther Burchard, Norbert Habermann, Peter Klüfers, Bernd Seger, Ulf Wilhelm
title = Cellulose in Schweizer's Reagent: A Stable, Polymeric Metal Complex with High Chain Stiffness
journal = Angewandte Chemie International Edition in English
year = 1994
volume = 33
issue = 8
pages = 884–887
doi = 10.1002/anie.199408841
*cite journal
author =Eduard Schweizer
title = Das Kupferoxyd-Ammoniak, ein Auflösungsmittel für die Pflanzenfaser
journal = J Prakt. Chem.
year = 1857
volume = 72
issue = 1
pages = 109–111
doi = 10.1002/prac.18570720115


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