Hybrid polydentate ligands

Nickel(H) complexes with ligands containing mixed donor atoms, in general N, O and S, are innumerable. In die present section we will mention complexes which are the archetypes or are suitable for the description of the properties of all complexes of the same type. Nickel complexes with hybrid polydentate ligands containing either P or As have been discussed in Section 50.5.4. 

Table 101 Complexes with Hybrid Polydentate Ligands...

Several types of telluroether (diorganyl tellmide) ligands are known. They can be monodentate or polydentate, acyclic, cyclic, and macrocyclic as well as hybrid telluroether ligands containing other donor atoms in addition to tellurium. Complexes with tellmoether ligands have seen extensive research activity in recent years (for two most recent reviews, see Refs. 27 and 35). 

As part of their interest in phospholes, Matano and coworkers have synthesized a family of hybrid hi-, tri-, and polydentate phosphole-1,2,3-triazole ligands [91]. Reaction of the protected 2-ethynylphosphole (66) with a range of aryl azides under standard CuAAC conditions followed by deoxygenation with trichlorosilane provided the bidentate phosphole-1,2,3-triazole ligands (68a-c) in excellent yields (Scheme 9). These bidentate ligands were then complexed to Pd(ll) or Pt(ll). When 68a was reacted with Pd(cod)Q2, the expected bidentate chelate complex forms. 

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