cis-Dichloridobis[diphenyl(4-vinylphenyl)phosphane-κP]platinum(II)

The title compound, [PtCl2(C20H17P)2], forms a monomeric cis-square-planar geometry. The Pt—P bond lengths are 2.2489 (9) and 2.2627 (9) Å, whereas the Pt—Cl bond lengths are 2.3566 (9) and 2.3336 (9) Å.

The geometry is a slightly distorted square planar and the Pt atom is slightly elevated out of the coordinating atom plane. The two P atoms are closer to each other but away from the two chloride atoms with angles of P1-Pt-P2 = 96.1 (4)° and Cl1-Pt-Cl2 = 87.7 (4)° whereas the P1-Pt-Cl1 is = 175.1 (4)° and that of P1-Pt-Cl2 being 89.6 (4)°T he title compound compares well with other closely related Pt II complexes from the literature containing two chloro and two tertiary phosphine ligands in a cis geometry. The title compound, containing Pt-Cl bond lengths of 2.3566 (9) and 2.3336 (9) Å and Pt-P bond distances of 2.2489 (9) and 2.2627 (9) Å, fits well into the typical range for complexes of this kind. Notably the title compound did not crystallise as a solvated complex; these type of Pt II complexes have a tendency to crystallise as solvates (Meijboom & Omondi, 2011).
Large thermal vibrations on the periphery of the molecule results in a badly defined C═C bond length. Disordered modelling resulted in an unstable refinement.
Experimental Diphenylphosphinostyrene (0.05 g, 0.35 mmol) was dissolved in acetone (5 ml). A solution of [Pt(COD)Cl 2 ] (0.05 g, 0.17 mmol) in acetone (5 ml) was added to the phosphine solution. The mixture was stirred for 5 min, after which the solution was left to crystallise. Yellow crystals of the title compound were obtained.

Refinement
The aromatic H atoms were placed in geometrically idealized positions (C-H = 0.95-0.98) and constrained to ride on their parent atoms with U iso (H) = 1.2U eq (C).
supplementary materials sup-2 Figures Fig. 1. The structure of the title compound, showing 50% probability displacement ellipsoids. For the C atoms, the first digit indicates ring number and the second digit indicates the position of the atom in the ring. Some labels have been omitted for clarity, all rings have been numbered in the same, systematic manner. H atoms are depicted by arbitrary size spheres. Hashed atoms are generated by symmetry (-x, -y, 1 -z).