Abstract

The coordination chemistry of the dimethylthallium (III) cation in solution has been investigated by infrared, Raman and nuclear magnetic resonance spectroscopy. Several solid compounds have also been isolated. In oxygen donor solvents, a linear C-Tl-C arrangement results, but in pyridine solution, a bent arrangement is found. The thallium-proton coupling constants for the linear complexes of dimethyl- and diethylthallium(III) are found to vary considerably with solvent. The results have been interpreted in terms of the way the donor strength of the solvent affects the mixing of the filled d??? and empty s orbitals of the thallium cations.

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