Isostructural Copper Research Articles

Über connellit als korrosionsprodukt von kupfer in zugleich chlorid-und sulfathaltigen elektrolyten

Copper hydroxide chloride sulphate (Connellite) has been found as corrosion product of copper in solutions containing both chloride and sulphate. The product is shown (by X-ray and electron diffraction, electron microscopy and chemical analysis) to be identical with synthetic Connellite. As the anion content may vary, authors consider Connellite to be a Berthollide compound. The hexagonal unit cell has been found to be a = 15·78 Å and c = 97#x000B7;11 Å in close agreement with previous work. The composition Cu 18(OH) 30Cl 4SO 4. 7H 2O has been derived from the unit cell, the density (3·40 g/cm 3; by the pyknometric method) and from chemical analysis. The hydrate water cannot be removed without the lattice being affected. The preparation of the isostructural copper hydroxide chloride nitrate (Buttgenbachite) has not yet been successful.