Organometallic chemistry polydentate ligand

The cyclopentadienyl ligand, Cp = IQs Id also has a significant presence in cluster chemistry. It is to organometallic chemistry what a polydentate ligand is to classical... 

The coordination chemistry of Ni features a very wide variety of mono- and polydentate ligands, with metal oxidation states ranging from 0 to +IV, although organometallic NU and NL species have been reported. The most common oxidation state by far is Ni , although Ni° complexes are also well known. Ni and Ni species are less common, while Ni complexes are established only for certain ligand types. Table 1 summarizes typical data on the oxidation states and stereochemistries of Ni complexes. The basic electronic and spectral features of Ni complexes have been reviewed. ... 

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