Add time:09/02/2019         Source:sciencedirect.com

Publisher SummaryThis chapter discusses thallium, especially Tl (III), which has much interesting solution chemistry. The increasing interest in thallium chemistry is because of several distinct applications. Besides the redox properties used in organic preparative chemistry and for model studies of electron transfer reactions, it can be perceived that thallium has found applications as a model for the general behavior of metal ions. The chemistry of thallium has also been investigated for its potential contribution to environmental pollution. Recent research on thallium compounds has been stimulated by the preparation of several thallium-containing high-temperature superconductors. Thallium (II) can be produced in aqueous solution by reduction of Tl (III) with hydrogen atoms or by radiolysis of aqueous solutions of Tl (I). The starting solution employed for the investigation of aqueous thallium (III) compounds can be prepared by dissolving commercial Tl2O3 in a mineral acid. More concentrated solutions are prepared by oxidation of thallium (I) compounds. Although the oxidation of the thallium (I) halide compounds poses no problems when oxidation is by the corresponding halogen, the preparation of noncomplexed Tl3+ is less straightforward.

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