Crystal and mol­ecular structures of di­chlorido­palladium(II) containing 2-methyl- or 2-phenyl-8-(diphenyphosphan­yl)quinoline

The crystal structures of di­chlorido­palladium(II) complexes bearing 2-methyl- and 2-phenyl-8-(di­phenyl­phosphan­yl)quinoline, namely, di­chlorido­[8-(di­phenyl­phosphan­yl)-2-methyl­quinoline-κ2N,P]palladium(II), [PdCl2(C22H18NP)] (1) and di­chlorido­[8-(di­phenyl­phosphan­yl)-2-phenyl­quinoline-κ2N,P]palladium(II), [PdCl2(C27H20NP)] (2), were analyzed and compared to that of the 8-(di­phenyl­phosphan­yl)quinoline (PQH) analogue (3). In all three complexes, the phosphanyl­quinoline moiety acts as a bidentate P,N-donating chelate ligand. In the PQH complex (3), the PdII center has a typical planar coordination environment; however, both the methyl- and phenyl-substituted phosphanyl­quinoline (PQMe and PQPh, respectively) complexes (1) and (2) exhibit a considerable tetra­hedral distortion around the PdII center, as parameterized by the τ4 values of 0.1555 (4) and 0.1438 (4) for (1) and (2), respectively. The steric inter­action from the substituted group introduced at the 2-position of the quinoline ring enforces the cis-positioned Cl ligand to be displaced from the ideal coordination plane. Also, the ideally planar phosphanyl­quinoline five-membered chelate ring shows a large bending deformation by the displacement of the PdII center from the quinoline plane. In addition, in the phenyl-substituted complex (3), the coordinating quinolyl and the substituted phenyl rings are not co-planar to each other, having a dihedral angle of 33.08 (7)°. This twist conformation prohibits any inter­molecular π–π stacking inter­action between the quinoline planes, which is observed in the crystals of complexes (1) and (2).