Strukturdynamische organometall-komplexe

摘要: Abstract The complexes (η 5 -C H )Pd(η 1 )PR 3 which are prepared from [Cl(PR )-Pd] 2 (μ-OCOCH ) and TlC fluxional in solution. According to the 13 C NMR spectra at various temperatures, two dynamic processes occur. process with higher activation energy is a π/σ /η exchange of different cyclopentadienyl ligands, whereas second one lower presumably metallotropic rearrangement (1,2-shift). coalescence temperature for η depends on size phosphine. X-ray structural analysis (C PdPPr i proves that it exists as “frozen” + structure crystal palladium approximately square-planar coordination. -bonded ring shows some unusual bonding patterns obviously electronic nature. EHT-MO calculations )PdCH (PH indicate this model system alternating CC distances stronger bond metal five carbon atoms ligand be expected. suggest similar possessing six-electron donor like − fragment isolobal PdCH , analogous distortions should observed. Some reactions compounds described.