78055-58-0Relevant academic research and scientific papers
Structural characterization of the head-to-head isomers of the [Pd2(Ph2Ppy)2Cl2] and [PtPd(Ph2Ppy)2I2] complexes (Ph2Ppy = 2-(diphenylphosphino)pyridine)
Párkányi, László,Szalontai, Gábor,Besenyei, Gábor
, p. 2933 - 2941 (2008/10/09)
The molecular structures of the thermodynamically unstable head-to-head isomers, HH-[Pd2(Ph2Ppy)2Cl2] and HH-[PtPd(Ph2Ppy)2I2], have been determined by single crystal X-ray diffraction. The two complexes have proved to be isostructural. The severe distortions of the bond angles from the ideal square planar geometry around the metal centers ligating the trans phosphorus donor atoms are indicative of a more pronounced internal strain in the HH isomers as compared to the HT counterparts. The enhanced internal strain is thought to be the major driving force responsible for the spontaneous conversion of the head-to-head isomers to their head-to-tail congeners. 13C NMR spectra in solution phase as well as solid-state 31P MAS NMR spectra have proved to be informative regarding the orientation of the asymmetric Ph2Ppy ligands.
Preparation of binuclear complexes using 2-(diphenylphosphino)pyridine as a bridging ligand. Synthesis of some ruthenium complexes and their interaction with palladium complexes
Maisonnet, Andre,Farr, James P.,Olmstead, Marilyn M.,Hunt, Catherine T.,Balch, Alan L.
, p. 3961 - 3967 (2008/10/08)
The reactions between Ru(Ph2Ppy)2(CO)3 and (1,5-cyclooctadiene)PdCl2 and between Ru(Ph2PPy)2(CO)2Cl2 and Pd2-(dibenzylideneacetone)3 have been examined as routes to binuclear Ru/Pd complexes. The first reaction produces Ru-(Ph2Ppy)2(CO)2Cl2, Ru(Ph2Ppy)(CO)2Cl2, Pd2(Ph2Ppy)2Cl2, and two isomers of RuPd(Ph2Ppy)2(CO)2Cl2, while the second forms predominantly the two binuclear products. Syntheses of Ru3(CO)9(Ph2Ppy)3, Ru(Ph2Ppy)2(CO)3, and Ru-(Ph2Ppy)2(CO)2Cl2 from Ru3(CO)12 are reported as are the preparations of Pd(Ph2Ppy)2Cl2 and Pd2(Ph2Ppy)2Cl2. All new compounds have been characterized by infrared spectroscopy and 31P{1H} NMR spectroscopy. The two isomers of RuPd(Ph2Ppy)2(CO)2Cl2 interconvert on heating in solution. The structure of one isomer has been determined unambiguously by X-ray crystallography. RuPd(Ph2Ppy)2(CO)2Cl2 crystallizes in the space group P21/c with cell dimensions (determined at 140 K) of a = 10.493 (2) ?, b = 17.685 (4) ?, c = 21.470 (5) ?, β = 92.07 (2)°, Z = 4, and V = 3982 (1) ?3. The structure was refined by blocked cascade least-squares to a conventional R value of 0.043 by using 4605 significant reflections. The compound possesses a Pd-Ru bond with a distance of 2.660 (1) ?. The palladium atom is four-coordinate with a Ru, Cl, P, N donor set, while the ruthenium atom is six-coordinate with a Pd, Cl, P, N, C2 donor set.
