Synthesis and Crystal Structure of trans-Rb2[Pd(NO2)2Cl2]. Structure Refinement of Na2[Pd(NO2)4]

The reaction products of palladium(II) nitration with sodium nitrite in the presence of rubidium salts are described. The crystal structure of rubidium dinitrodichloropalladoate(II) — trans-Rb₂Pd(NO₂)₂Cl₂] — has been studied (KUMA automatic diffractometer, MoK radiation, graphite monochromator, /2 scan mode for 2 < 30°, 758 experimental reflections, R = 0.030; R = 0.023 for I>2(I)). Crystal data: a = 15.123(3), b = 7.750(2), c = 7.776(2) , V = 911.4(4) ³, space group Cmca, Z = 4, d _calc = 3.209 g/cm³. The structure consists of Pd(NO₂)₂Cl₂]^2– complex anions and Rb⁺ cations. The planar square coordination of the Pd atom is completed to distorted octahedral by the chlorine atoms of the neighboring complexes at Pd...Cl distances of 3.18 . Chains of complexes with alternating orientations are formed. The geometrical characteristics of the complex anions, the coordination polyhedra of the cations, and the heavy atom sublattice are analyzed. The crystal structure of Na₂Pd(NO₂)₄] has been refined, and refinement data are given.