Abstract
A new spectroscopic method for the investigation of rare earth halides in methanolic solutions is used to determine the effects of the solvent and solvation on the stability, electronic spectra and structures of individual rare earth chlorocomplexes. A numerical treatment of several thousand experimental optical density data covering all absorption ranges in the UV, visible and near IR is performed. Several possible models of the constitution of the solutions are tested to ensure the uniqueness of the conclusions. In methanol, the stabilities of LnCl 2+ and LnCl 2 2+ (Ln ≡ Pr, Nd, Sm) are a maximum for the neodymium complexes; the presence of water in the mixed methanol-water solvents leads to a decrease in the number and stabilities of the rare earth chlorocomplexes.
Published Version
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