Arsines bidentate tertiary

Complexes with bidentate tertiary phosphines, arsines and stibines 116... 

A large number of nickel(II) complexes with bidentate tertiary phosphines and arsines have been prepared and characterized since the initial reports on o-phenylenebisdimethylarsine and 1,2-bisdiphenylphosphinoethane (Table 64 XVIII, III) by Chatt and Mann,1267 and Wymore and Bailar126 respectively. The most common diphosphines, diarsines, distibines and mixed donor ligands are collected in Table 64 and selected nickel(II) complexes are reported in Table 65. 

Complexes with monodentate tertiary phosphines, arsines and stibines Complexes with alkyl and aryl phosphites as ligands Complexes with bidentate tertiary phosphines, arsines and stibines... 

For convenience we consider these together. As with tertiary phosphines, arsines and stibines the oxidation states featured in the chemistry of these bidentate ligands are II, III and IV, with the former being predominant. 

The halo ligands of these complexes can be replaced by other anionic ligands.918 One of the mutually trans tertiary arsine ligands can be replaced by other monodentate ligands such as pyridine (equation 215). Two ligands can be replaced by bidentate nitrogen ligands (equation 216) 1014 these latter products are discussed below in Section 48.6.3.6. 

Complexes containing coordinated tertiary phosphines or arsines of the type [Rh2(PF3)4L2(alkyne)] and [Rh2(PF3)2L2(alkyne)] (L = mono-dentate, L = bidentate ligand) are readily obtained by displacement of PF3 from [Rh2(PF3)6(alkyne)] under mild conditions (method D). There are also reports of displacement of CO by PF3 from an alkyne metal carbonyl complex (method E) e.g., 113). 

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