Ligand triphosphines

Bardaji, M., Laguna, A., Orera, V.M. and Villacampa, M.D. (1998) Synthesis, Structural Characterization, and Luminescence Studies of Gold(l) and Gold(lll) Complexes with a Triphosphine Ligand. Inorganic Chemistry, 37(20), 5125-5130. 

Bardaji, M., Laguna, A., Vicente, J. and Jones, P.G. (2001) Synthesis of luminescent gold(I) and gold(III) complexes with a triphosphine ligand. Inorganic Chemistry, 40, 2675-2681. 

Figure 2.35 Trinuclear gold compound with bridging thiolate and triphosphine ligands.

The reduction of [NiBr(np3)]+ with Blf in the presence of S02 (equation 74) results in the formation of the complex [Ni(np3)(S02)] (63)261 which contains S02 coordinated in a bent mode. With the p3 ligand the same reaction occurs without reducing agents, since the triphosphine itself can reduce nickel(II) (equation 75). 

By the metathetical reaction of complex (69) with some tridentate phosphine or arsine ligands, a number of complexes of the type [Ni(C3Ph3)L]Y (Y = CIO4, BPI14, L = triphosphine, triarsine) have been obtained (equation 98). 

Very recently, Togni reported a chiral C2-symmetric tridentate PCP ligand (47) [90] related to the previously developed triphosphine Pigiphos (46)... 

The only example of Si H M agostic interaction supported by a phosphorus bridge was discovered by Driess et al. in the complexation of a silylated triphosphine ligand to a chromium tricarbonyl complex [Eq. (20)].143,144 A bigger metal (M = Mo) or smaller substituent at silicon (R = Ph) leads to the normal triphosphine complexes. The presence of a Si H "M interaction in 59 is deduced from the lack of C3 symmetry (evident from NMR), the red shift of the IR band for the coordinated Si-H bond (1994 cm-1 vs. 2142 cm-1), and the observation of a reduced Si-H coupling (135.7 Hz for the coordinated Si-H bond vs. 210.9 and 228.6 Hz for the free Si-H bonds). The X-ray structure determination of 59 shows that one of the phosphine ligands is tilted away from the chromium atom so that the... 

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