Kinetics characteristics of dissolving PdCl₂ in water-chlorid solutions

The reaction of dissolution of solid PdCl₂ in water-chloride media at room temperature was studied. It was established that the reaction proceeds via a mechanism of topochemical reaction. With the ionic strength fixed, the reaction rate constant is shown to depend on the chloride ion concentration with n = -2, thus confirming that this reaction goes through the formation of hydroxyl and aquachloride complexes of palladium. At low chlorides background С (NaCl) < 0.3 M, and the topochemical nature of the reaction is mainly determined by hydroxide concentration in equilibrium with aquachloride complexes of palladium. The nature and rate of topochemical reaction is determined by concentration of NaCl. With decreasing the concentration of chloride ion from 1 M to 0.2 M reaction proceeds from kinetic to diffusion region.

aquachloride complexes of palladium, kinetics, the rate constant, ionic strength, chloride ion.

1. Vicente J., Arcas A. Aqua palladium complexes: Synthesis, properties and applications // Coordination Chemistry Reviews. 2005. V. 249. P. 1135-1154.

2. Buryak N.I., Volkov S.V. Synthesis of palladium nanoparticles by the thermal destruction of Pd (II) solvate complexes in alcohols // Nanosystems, Nanomaterials, Nanotechnologies. 2008. V. 6. № 1. P. 273-279.

3. Kublanovskii V.S., Nikitenko V.N., Rudenko K.P. Energiya aktivatsii elektrovosstanovle-niya bis-imminodiatsetatnykh kompleksov palladiya (II) // Vestnik Khar'kovskogo natsional'nogo universiteta. 2009. № 870. Khimiya. Vyp. 17(40). C. 270-276.

4. Zolotov Yu.A., Varshal G.M., Ivanov V.M. Analiticheskaya khimiya metallov platinovoi gruppy. M.: Editorial URSS, 2003. 592 s.

5. Egorova V.V., Krylov A.V., Flid V.R., Tigina N.I. Kvantovo-khimicheskoe modelirovanie zameshcheniya ligandov v ploskokvadratnykh akvakhloridnykh kompleksakh palladiya // Izvestiya AN. Seriya Khimicheskaya. 2012. № 10. C. 1829-1833.

6. Mille N.B., Bugareie Z.D. Hydrolysis of palladium (ii) ion in a sodium chlorid medium // Transition Met. Chem. 1984. V. 9. P. 173-176.

7. Tret'yakov Yu.D. Tverdofaznye reaktsii. M.: Khimiya, 1978. 360 s.

8. Leonova E.V., Syundyukova V.Kh., Denisov F.S. Metody elementoorganicheskoi khimii. Kobal't, nikel', platinovye metally / pod red. A.N. Nesmeyanova i K.A. Kocheshkova. M.: Nauka, 1978. 783 s.

9. Bakhtieva E.A., Krylov A.V., Solov'ev M.S., Morozova T.A. Vliyanie prirody spirtov na obrazovanie palladiisoderzhashchikh nanochastits v sisteme PdCl2-NaCl-H2O // Vestnik MITKhT. 2013. T. 8. № 4. S. 80-84.