Leo Kirsten

trans-Dichloridobis(4,8-dimethyl-2-phenyl-2-phosphabicyclo[3.3.1]nonane-κP)platinum(II).

The crystal structure of the title compound, trans-[PtCl(2)(C(16)H(23)P)(2)], has been determined at 100 K. The Pt atom is located on a twofold axis and adopts a distorted square-planar coordination geometry. The structure is only the second example of a coordination complex containing a derivative of the 4,8-dimethyl-2-phosphabicyclo[3.3.1]nonane (Lim) phosphine ligand family. The ligand contains four chiral C atoms, with the stereochemistry at three of these fixed during synthesis, therefore resulting in two possible ligand stereoisomers. The compound crystallizes in the chiral space group P4(3)2(1)2 but is racemic, comprising an equimolar mixture of both stereoisomers disordered on a single ligand site. The effective cone angles for both isomers are the same at 146°.

trans-Dibromidobis(tri-p-tolyl­arsine)palladium(II)

In the title compound, [PdBr2(C21H21As)2], the PdII ion, residing on a centre of symmetry, is coordinated by two As donor atoms [Pd—As = 2.4276 (2) Å] and two Br anions [Pd—Br = 2.4194 (2) Å] in a distorted square-planar geometry [Br—Pd—As = 87.786 (7)°]. A weak intramolecular C—H⋯Br interaction occurs. In the crystal structure, intermolecular C—H⋯Br interactions are observed.

trans-Dibromidobis[diphen-yl(p-tol-yl)phosphine]palladium(II).

In the title compound, [PdBr2(C19H17P)2], the PdII ion resides on a centre of symmetry and is coordinated by two Br anions [Pd—Br = 2.4266 (2) Å] and two P-donor ligands [Pd—P = 2.3462 (5) Å] in a slightly distorted square-planar geometry [P—Pd—Br = 93.528 (12)°]. Weak intermolecular C—H⋯Br hydrogen bonds link molecules into chains extended in [10].

Dibromidobis(triphenyl­arsine)palladium(II)

In the title compound, [PdBr2(C18H15As)2], the PdII ion resides on a centre of symmetry and is coordinated by two As atoms [Pd—As = 2.4184 (3) Å] and two Br anions [Pd—Br = 2.4196 (3) Å] in a slightly distorted square-planar geometry [As—Pd—Br = 90.12 (1)°]. The crystal packing exhibits weak intermolecular C—H⋯Br interactions.

trans-Dibromidobis[tris-(4-chloro-phen-yl)phosphine]palladium(II).

In the title compound, [PdBr2(C18H12Cl3P)2], the PdII ion is situated on a centre of symmetry and is coordinated by two Br anions [Pd—Br = 2.4252 (2) Å] and two P-donor ligands [Pd—P = 2.3317 (6) Å] in a slightly distorted square-planar geometry [P—Pd—Br = 86.589 (15)°].

trans-Bromo­carbonyl­bis(triphenyl­phosphine)rhodium

The title compound, [RhBr(C18H15P)2(CO)], can be characterized as a rhodium(I) Vaska-type compound based only on the spectroscopic [νKBr(CO), 31P] data. A low-temperature X-ray crystallographic analysis shows that the compound possesses a crystallographically imposed centre of symmetry with a statistically disordered Br atom and CO group. The essentially different occupancies for the Br atom and the CO group [0.283 (2) and 0.717 (2), respectively] suggest that the compound exists as a mixture of rhodium(0), rhodium(I) and rhodium(II) complexes.