In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Quality Control of Tetrakis(acetonitrile)palladium(II) tetrafluoroborate, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 21797-13-7, name is Tetrakis(acetonitrile)palladium(II) tetrafluoroborate. In an article£¬Which mentioned a new discovery about 21797-13-7
Using Ligand Bite Angles to Control the Hydricity of Palladium Diphosphine Complexes
A series of [Pd(diphosphine)2](BF4)2 and Pd(diphosphine)2 complexes have been prepared for which the natural bite angle of the diphosphine ligand varies from 78 to 111. Structural studies have been completed for 7 of the 10 new complexes described. These structural studies indicate that the dihedral angle between the two planes formed by the two phosphorus atoms of the diphosphine ligands and palladium increases by over 50 as the natural bite angle increases for the [Pd(diphosphine)2](BF4)2 complexes. The dihedral angle for the Pd(diphosphine)2 complexes varies less than 10 for the same range of natural bite angles. Equilibrium reactions of the Pd(diphosphine)2 complexes with protonated bases to form the corresponding [HPd(diphosphine)2]+ complexes were used to determine the pKa values of the corresponding hydrides. Cyclic voltammetry studies of the [Pd(diphosphine)2](BF4) 2 complexes were used to determine the half-wave potentials of the Pd(II/I) and Pd(I/0) couples. Thermochemical cycles, half-wave potentials, and measured pKa values were used to determine both the homolytic ([HPd(diphosphine)2]+ ? [Pd(diphosphine) 2]+ + H.) and the heterolytic ([HPd(diphosphine)2]+ ? [Pd(diphosphine) 2]2+ + H-) bond-dissociation free energies, DeltaGH. and DeltaGH-, respectively. Linear free-energy relationships are observed between pKa and the Pd(I/0) couple and between DeltaGH- and the Pd(II/I) couple. The measured values for DeltaGH. were all 57 kcal/mol, whereas the values of DeltaGH- ranged from 43 kcal/mol for [HPd(depe)2]+ (where depe is bis-(diethylphosphino)ethane) to 70 kcal/mol for [HPd(EtXantphos)2]+ (where EtXantphos is 9,9-dimethyl-4,5-bis(diethylphosphino)xanthene). It is estimated that the natural bite angle of the ligand contributes approximately 20 kcal/mol to the observed difference of 27 kcal/mol for DeltaGH-.
I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 21797-13-7, help many people in the next few years.Quality Control of Tetrakis(acetonitrile)palladium(II) tetrafluoroborate
Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method