Abstract
The results obtained in an investigation of rhodium(III) oxalates indicate that heating of pure rhodium(III) hydroxide with oxalic acid solution produces RhOx 3 −3 to a great extent, but that the reaction does not go to completion, other aquo-coördinated oxalato complexes of rhodium being formed in smaller quantities. Evidence is presented that in order to obtain complete conversion of rhodium(III) into potassium rhodiotrioxalate the chloride must be heated under reflux with four to five times its weight of potassium oxalate for at least 6 hours. The absorption spectrum, the stability to heating and aging at room temperature in solution, as well as the electrophoretic, paper- and ion-exchange chromatographic properties of the rhodiotrioxalate ion were studied. It was shown that the dextro- and laevo-forms of RhOx 3 −3 have identical electrophoretic mobilities.
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