摘要:
Organometallic complexes of the type [(COD)PdMe(L)](n+) (COD = 1,5-cyclooctadiene; n = 0, L = Cl, OH, OMe, OEt, OiPr, OPh, OTol, OMes; n = 1, L = H2O, PPh3, pyridine or collidine; n = 2, L = N-methyl-pyrazinium) were prepared and spectro-scopically characterised. The crystal structure of [(COD)PdMe(Col)](SbF6) and EXAFS studies on selected samples reveal structural characteristics of these complexes. The complexes undergo fast ligand exchange reactions in solution giving rise to new mono or binuclear palladium complexes. Neutral complexes with oxo-ligands OR are highly reactive towards oxo-nucleophiles, including water. The hydroxo complex [(COD)PdMe(OH)] and its structurally characterised dimeric analogue [(mu-OH){(COD)PdMe}(2)](+) seem to play an important role in hydrolysis reactions. (C) 2002 Elsevier Science B.V. All rights reserved.