Properties
The solid is diamagnetic. In terms of their coordination spheres, copper centres are 2-coordinated and the oxides are tetrahedral. The structure thus resembles in some sense the main polymorphs of SiO2, and both structures feature interpenetrated lattices.
Copper(I) oxide dissolves in concentrated ammonia solution to form the colourless complex [Cu()2]+, which is easily oxidized in air to the blue [Cu(NH3)4(H2O)2]2+. It dissolves in hydrochloric acid to give solutions of CuCl2?. Dilute sulfuric acid and nitric acid produce copper(II) sulfate and copper(II) nitrate, respectively.[4]
Cu2O degrades to copper(II) oxide in moist air.
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