Effect of the pH of the medium on the structure of gadolinium-containing complexes according to EPR dataстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Местоположение издательства:Road Town, United Kingdom
Первая страница:1284
Последняя страница:1289
Аннотация:Dilute and concentrated aqueous solutions of gadolinium acetate and chloride were studied by EPR in a wide range of pH. It was shown that, at pH < 2, the compositions of gadolinium aqua ions (and probably of other rare earth metals) in dilute and concentrated solutions are identical: [Gd(OH2)8]3+. At higher pH, this complex was found to hydrolyze to aqua hydrocomplexes. Experiments showed that the crystal field acting on Gd3+ in [Gd(OH2)8]3+ is weak. This result was explained under the assumptions that water molecules are exchanged between aqua complexes and the solvent or that the cubic coordination polyhedral is nonrigid (i.e., the Oh ↔ D4d transitions occur).