849540-95-0Relevant academic research and scientific papers
Bonding in palladium(II) and platinum(II) allyl MeO-and H-MOP complexes. Subtle differences via13C NMR
Kumar, P.G. Anil,Dotta, Pascal,Hermatschweiler, Rene,Pregosin, Paul S.,Albinati, Alberto,Rizzato, Silvia
, p. 1306 - 1314 (2005)
13C NMR studies have shown that in both Pd(II)- and Pt(II)-allyl (modified-MOP) (MOP = (S)-2-diarylphosphino-1,1'-binaphthyl) complexes the substituent on the MOP auxiliary can affect how the naphthyl backbone interacts with a metal center. With the MeO-MOP analogue, the metal binds the carbon in a weak η1-fashion, whereas with H-MOP it prefers an η2-binding mode. For the Pt complexes, the 1J( 195Pt,13C) values proved to be diagnostic tools. Both modes of bonding afford relatively weak bonds to the metal. Modifying the MOP ligand structure from a PPh2 to a P(3,5-di-tert-butylphenyl) 2 analogue can markedly affect the bond distances within the coordination sphere, as indicated by the X-ray structural data for PdCl(η3-C3H5(modified-MOP). 2-D NMR exchange spectroscopy can be used to recognize and distinguish between the two most common types of η3-η1-η3 isomerization process, i.e., rotation around the allyl C-C bond versus rotation around the allyl M-C bond. For the complex PdCl(η3-C 3H5)(H-MOP), the fastest isomerization process involves rotation around the allyl C-C bond.
