Crystal structures of di­chlorido­palladium(II), -platinum(II) and -rhodium(III) complexes containing 8-(di­phenyl­phosphan­yl)quinoline

The crystal structures of di­chlorido­palladium(II), -platinum(II) and -rhodium(III) complexes containing 8-(di­phenyl­phosphan­yl)quinoline, (SP-4)-[PdCl(2)(C(21)H(16)NP)], (1) [systematic name: di­chlor­ido­(8-di­phenyl­phosphanyl­quinoline)­palladium(II)], (SP-4)-[PtCl(2)(C(21)H(16)NP)]·CH(2)Cl(2), (2) [systematic name: di­chlorido­(8-di­phenyl­phos­phanyl­quinoline)­platinum(II) dichlorometh­ane monosolvate], and (OC-6–32)-[RhCl(2)(C(21)H(16)NP)(2)]PF(6)·0.5CH(2)Cl(2)·0.5CH(3)OH, (3) [systematic name: cis-di­chlor­ido­bis­(8-di­phenyl­phosphanyl­quinoline)­rhodium(III) hexa­fluorido­phos­phate di­chloro­methane/­methanol hemisolvate] are reported. In these complexes, the phosphanyl­quinoline acts as a bidentate ligand, forming a planar asymmetrical five-membered chelate ring. The palladium(II) and platinum(II) complex mol­ecules in (1) and (2), respectively, show a typical square-planar coordination geometry and form a dimeric structure through an inter­molecular π–π stacking inter­action between the quinolyl rings. The centroid–centroid distances between the stacked six-membered rings in (1) and (2) are 3.633 (2) and 3.644 (2) Å, respectively. The cationic rhodium(III) complex in (3) has a cis(Cl),cis(P),cis(N) (OC-6–32) configuration of the ligands, in which two kinds of intra­molecular π–π stacking inter­actions are observed: between the quinolyl and phenyl rings and between two phenyl rings, the centroid–centroid distances being 3.458 (2) and 3.717 (2) Å, respectively. The PF(6) (−) anion in (3) is rotationally disordered, the site occupancies of each F atom being 0.613 (14) and 0.387 (14). The CH(2)Cl(2) and CH(3)OH solvent mol­ecules are also disordered and equal site occupancies of 0.5 are assumed.