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三羟基苯及其衍生物是一类重要配体,如3,4,5-三羟基苯甲酸(GA)与铀、钍及稀土生成沉淀,并可用于铀、钍、稀土的连续测定。我们在研究用GA离铀、钍、稀土时,GA与铀生成1种棕色配合物,早期曾用于铀的比色测定,它可能是一种单核与多核配合物的混合物,但对这类化合物与铀的配位反应迄今来作过详细研究。本文用光度法研究了GA、连苯三酚(PGA)、3,4,5-三羟基苯甲酸丙酯(PGE)与3,4,5-三甲氧基苯甲酸(TMBA)与铀(Ⅵ)的配位反应,研究了配合物的组成及其反应机理,测定了部分配合物的稳定常数。
Trihydroxybenzene and its derivatives are important ligands such as 3,4,5-trihydroxybenzoic acid (GA) and uranium, thorium and rare earth precipitation, and can be used for continuous determination of uranium, thorium and rare earth. When we studied the separation of GA from uranium, thorium and rare earths, GA produced a brown complex with uranium, which was used for the colorimetric determination of uranium in the early stage. It may be a mixture of mononuclear and polynuclear complexes, The coordination reaction of compounds with uranium has been studied in detail so far. In this paper, the effects of GA, pyrogallol (PGA), 3,4,5-trimethoxybenzoic acid (PGE), 3,4,5-trimethoxybenzoic acid (TMBA) and uranium ) Coordination reaction, the composition of the complex and its reaction mechanism was studied, and the stability constants of some complexes were determined.