Abstract
Several salts containing the complex anions [CuCl 4]= or [CuBr 4]= have heen prepared, and their spectra have been measured and interpreted in terms of ligand-field theory. They exhibit a d-d band with $$\tilde v_{max} $$ about 8–9000 cm−1, and several well defined charge-transfer bands in the visible and near ultraviolet spectral range. Several experimental facts, supported by theoretical considerations, indicate that the structure of the [CuX 4]= anions is not a truly tetrahedral, but a flattened tetrahedral one, of symmetry D 2d . Details on the course of the endothermic solvolysis reactions which occur in polar organic solvents, and on the probable nature of the solvolysis products are reported and discussed.
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