Palladium Nitrate Solution as an Efficient Precursor for Chlorine-Free Method of Obtaining Palladium Salts
R. F. Mulagaleev, L. A. Solovyev, S. D. Kirik, L. V. Ivanova, V. A. Vostrikov, S. N. Mamonov
Keywords: palladim, palladium nitrate solution, synthesis of palladium acetate, palladium nitrate, palladium acetate, nitrosation
Pages: 347-354
Abstract
For the synthesis of palladium acetate [Pd(CH3COO)2]3 as example, the features of the behaviour of pallaium nitrate solution as a precursor for the technology of industrial synthesis of palladium salts without chlorine-containing reagents aer studied. It is discovered that the oxygenated compounds of nitrogen that are present in the solution affect branching of the syntheis trajectory. It is shown that the formation of the final products proceeds through a series of intermediate stages at which new and already known chemical compounds were isolated: [Pd3(CH3COO)6], [Pd(NO)2O], [Pd(NO)NO2], [Pd2(CH3COO)2(NO)2]4, [Pd6O2(CH3COO)3(NO2)6 - x(NO)x](H3O)(H2O)5 (x = 0-3), [Pd3(CH3COO)5NO2], катена-[Pd(CH3COO)2]n, catena-[Pd(HCOO)2]n, catena-[Pd(NO)2Cl2]n, catena-[Pd(NO)X]n (X = Cl or Br). Isolation and investigation of intermediate products allowed us to propose a scheme of the transition of the nitrate coordination surroundings of palladium into the acetate one. Side processes realized in the system are initiated, as a rule, by nitrosation reactions. On the basis of the data obtained, a set of industrial methods of obtaiing palladium acetate was developed.
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