title: 31P NMR study of the stoichiometry, stability and thermodynamics of complex formation between palladium(II) acetate and bis(diphenylphosphino)ferrocene.
abstract: The complexation reaction between palladium (II) acetate, and 1,1'-bis(diphenylphosphino)ferrocene, DPPF, was investigated in two different deuterated solvents CDCl(3) and DMSO at various temperatures using (31)P NMR spectroscopy. The exchange between free and complexed DPPF is slow on the NMR time scale and consequently, two (31)P NMR signals were observed. At metal ion-to-ligand mole ratio larger than 1, only one (31)P NMR signal was observed, indicating the formation of a 1:1 Pd(2+)-DPPF complex in solution. The formation constant of the resulting 1:1 complexes was determined from the integration of two (31)P signals. The values of the thermodynamic parameters (DeltaH, DeltaS and DeltaG(298)) for complexation were determined from the temperature dependence of stability constants. It was found that, in both solvents, the resulting complex is mainly entirely enthalpy stabilized and the DeltaH compensates the TDeltaS contribution.
authors.affiliation: Faculty of Chemistry, Razi University, Kermanshah 67149, Iran. mirandoust@razi.ac.ir
authors.forename: Mohsen
authors.initials: M
authors.lastname: Irandoust
authors.forename: Mohammad
authors.initials: M
authors.lastname: Joshaghani
authors.forename: Ezzat
authors.initials: E
authors.lastname: Rafiee
authors.forename: Mahbubeh
authors.initials: M
authors.lastname: Pourshahbaz
mesh_terms: D000085:Acetates / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D000075163:Metallocenes; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010720:Phosphines / Q000737:chemistry*; D013237:Stereoisomerism; D013816:Thermodynamics
chemical_list: D000085:Acetates; D005296:Ferrous Compounds; D000075163:Metallocenes; D009942:Organometallic Compounds; D010720:Phosphines; C516071:palladium(II) acetate; C519379:1,1'-bis(diphenylphosphino)ferrocene