Abstract
The isolation of the first nickel(III) complexes containing thio- or seleno-ether donor groups is reported, specifically [Ni{ o-C 6H 4(PPh 2)(EMe)}Br 3] (E = S, Se), [Ni{ o-C 6H 4(PMe 2)(SeMe)} 2Br 2]BF 4, and [Ni{ o-C 6H 4(AsMe 2)(SeMe)} 2Br 2]BF 4. Palladium(IV) and platinum(IV) complexes of o-C 6H 4(AsMe 2)(EMe) of type [Pd(LL)X 4] or [Pt(LL)X 4] (X = Cl or Br) are also described. The complexes have been characterised by analysis, IR, UV-Vis, multinuclear NMR and ESR spectroscopy as appropriate. The hybrid group VB-VIB donor ligands are in all cases much less effective at stabilising high oxidation state metal centres than diphosphines or diarsines.
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