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Journal of Structural Chemistry

2009 year, number 5

EPR STUDY OF SOLID SOLUTIONS OF [Cr(NH3)5Cl]x[Rh(NH3)5Cl]1-x[PdCl4nH2O AND [Cr(NH3)5Cl]x[Rh(NH3)5Cl]1-x[PtCl4] COMPOUNDS

V. A. Nadolinny, N. A. Nebogatikova, P. E. Plyusnin, S. V. Korenev
Keywords: EPR spectroscopy, chromium, rhodium, palladium, platinum, chloropentaammine complexes
Pages: 951-954


In order to determine the features of the structure of double complex salts (DCSs) of [Cr(NH3)5Cl]×
[MCl4nH2O, where M = Pd, Pt, n = 0, 1, the DCS solid solutions of palladium and platinum with isostructural DCSs containing the chloropentaammine rhodium cation, [Cr(NH3)5Cl]x[Rh(NH3)5Cl]1-x× [MCl4nH2O, where x = 0.01-0.2, are synthesized and studied by the EPR method. DCSs with the isostructural chloropentaammine rhodium cation are used as a diluter for magneto concentrated systems. It is shown that DCS of platinum and anhydrous DCS of palladium have the identical environment of chromium ions. The EPR spectra of chromium ions for these compounds are described by the following spin Hamiltonian parameters: S = 3/2, gxx = 1.987, gyy = 1.987, gzz = 1.985, D = 1660 Gs, E = 235 Gs. For the palladium complex containing crystalline water, the EPR spectra of chromium ions are described by the parameters: S = 3/2, gxx = 1.984, gyy = 1.984, gzz = 1.984, D = 1060 Gs, E = 350 Gs. A decrease in the crystal field parameters for the aqueous palladium complex is caused by a redistribution of the electron density to the oxygen atom in the second sphere of the chromium ion environment.