ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Halocopper(II) complexes in acetic acid anhydride. I. Spectrophotometric study of the chloro- and bromocopper(II) complexes

Z. Biela and J. Gažo

Department of Inorganic Chemistry, Slovak Technical University, 880 37 Bratislava

Abstract: A spectrophotometric study of the systems Cu(ClO₄)₂.6H₂O-LiCl-Ac₂O and Cu(ClO₄)₂.6H₂O-LiBr-Ac₂O established that the 2 absorption bands at 21,000 and 15,350 cm^-1, resp., belong to a single absorbing particle, a complex ion with the ratio of X/Cu = 3 (X = Cl, Br). The complex ions CuX42- are formed in Ac2O solns. in appreciable amts. only at a large excess of halides. Their absorption max. in the visible region occur at 25,000 and 19,300 cm-1. Based on the spectral data, the structure of CuX₄^2- ions was assumed to be a distorted tetrahedron, similar to the structure of some compds. of the type A₂CuX₄ in the solid state. Ions [CuX₃(Ac₂O)]^- are formed on solvolysis of CuX₄^2- and their structures are almost square-planar.

Full paper in Portable Document Format: 301a42.pdf

Chemical Papers 30 (1) 42–51 (1976)