cis-Bis(di­methyl sulfoxide-S)­dinitrato­palladium(II) and cis-dinitratobis(1,4-oxathiane-S)­palladium(II)

The Pd atom in each of the two title compounds, Pd(NO₃)₂(C₂H₆OS)₂], (I), and Pd(NO₃)₂(C₄H₈OS)₂], (II), coordinates two O atoms from two nitrate ligands and two S atoms from di­methyl sulfoxide (dmso) and thio­xane (systematic name: 1,4-oxathiane) ligands in a pseudo-square-planar cis-geometry. In the dmso complex, the distances to palladium are Pd—O 2.067 (2) and 2.072 (2) Å, and Pd—S 2.2307 (11) and 2.2530 (8) Å. The corresponding distances in the thio­xane complex are Pd—O 2.053 (3) and 2.076 (2) Å, and Pd—S 2.2595 (9) and 2.2627 (11) Å. Both compounds may be regarded as dimers with an inversion centre, where one of the coordinating nitrate O atoms in one mol­ecule also interacts with the Pd atom in the adjacent mol­ecule, with Pd—O distances of 2.849 (9) and 3.31 (3) Å in (I) and (II), respectively.