Abstract
The stability constants and the electronic spectra of four molecular chlorocomplexes formed in acetic acid solutions have been calculated. The spectrophotometric measurements were performed at wavelengths ranging from 260 to 500nm and, in the near IR from 600 to 1400nm. The matrix rank treatment of more than 1000 spectrophotometric data demonstrates a minimum of five absorbing species: the solvated copper (II) acetate and four chlorocomplexes. The overall stability constants of Cu (OAc)Cl, CuCl 2, LiCuCl 3 and LiCuCl 4 are respectively: log β 1 = 3.38; log β 2 = 5.57; log β 3 = 7.36; log β 4 = 7.83. The structure of the monochlorocuprate with the Cu-OAc bonding in the primary coordination sphere is supported by near-IR evidence. The bathochromic shift of the absorption maxima of the d-d transition bands indicates structural changes of the complexes with a square planar configuration for Cu (OAc)Cl promoted to a flattened tetrahedron for Li 2CuCl 4.
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