Two square-planar palladium(II) complexes with P,O-bidentate hybrid ligands

In the two square-planar palladium(II) complexes chloro[(diphenyl­phosphinoamino)diphenyl­phosphine oxide]methyl­palladium(II) dimethyl sulfoxide solvate, [Pd(CH₃)Cl(C₂₄H₂₁NOP₂)]·C₂H₆OS, (I), and chloro­{[2-(diphenyl­phosphino)phen­yl]dieth­oxymethane}methyl­palladium(II), [Pd(CH₃)Cl(C₂₃H₂₅O₂P)], (II), a trans disposition of the diphenyl­phosphino and chloro groups is observed. The Pd atom in both complexes displays a distorted square-planar configuration formed by the four unique donor atoms (P, Cl, C and O). In compound (I), the five-membered Pd-P-N-P-O metallacycle is best described as having an envelope conformation, whereas in (II) the six-membered Pd-P-C-C-C-O metallacycle adopts a skewed boat conformation. Furthermore, within the P-N-P-O backbone in (I), the P-N distances are consistent with single-bond character [1.659 (3) and 1.692 (3) Å], whilst the P=O bond shows appreciable double-bond character [1.509 (2) Å].