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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 CuX42- 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 CuX42- and their structures are almost square-planar.

Full paper in Portable Document Format: 301a42.pdf

 

Chemical Papers 30 (1) 42–51 (1976)

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