om0003640_si_002.pdf (334.93 kB)
Synthesis and Structural Comparison of TpiPr2Rh[cis-1,2-bis(diphenylphosphino)ethene]: Factors Determining Hapticity (κ2 vs κ3) of the TpiPr2 Ligand in TpiPr2Rh(diphosphine) Complexes
journal contribution
posted on 2000-08-05, 00:00 authored by Munetaka Akita, Mariko Hashimoto, Shiro Hikichi, Yoshihiko Moro-okaComparison of structural and spectroscopic
features of the Rh(I)−diphosphine complexes TpiPr2Rh(Ph2P−X−PPh2) reveals that the dominant factor governing hapticity of the TpiPr2 ligand (κ2 vs κ3) is conformation of the central rhodadiphosphacycle. A folded
RhP2X conformation hinders coordination of the pendant
pyrazolyl group due to steric repulsion with the bridging
part (X) in diphosphine to lead to a κ2-TpiPr2 species,
whereas κ3-coordination is found in complexes with a
flat RhP2X conformation.