Abstract
The bromide complexes of copper(II) were studied spectrophotometrically in acetic acid. This non-dissociating solvent presents secondary equilibria such as perchlorate ⇌ acetate and in the case of copper acetate in acetic acid, monomer ⇌ dimer. A matrix rank treatment of the optical densities identified four mononuclear bromo complexes which are formulated as Cu(OAc)Br, CuBr 2, LiCuBr 3 and Li 2 CuBr 4. The overall stability constants of these species are log β 1 = 3.2, log β 2 = 6.5, log β 3 = 7.7 and log β 4 = 7.7. The electronic spectra of the individual species, in this solvent, are reported for the first time. The d-d transition band of the tetrabromocuprate is calculated to be at 1120 nm and confirms the structure of a flattened tetrahedron.
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