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Organometallic Chelate Complexes of the π–π and π–n Type

Organometallic chelate complexes in which either organic fragments π-bonded to the metal (chelates of the π–π type) or complexes where heteroatomic groups with an unshared electron pair (NR2, PR2, AsR2, OR, etc.) linked to the metal via an n-type bond (chelates of the π–n type) are present together with the π-bonded fragments are examined. Data on complexes with polydentate ligands, including different combinations of fragments π- and n-coordinated to the metal are also surveyed. The characteristic features of the formation of organometallic chelates of the π–π and π–n types, which depend on the properties of the chelating ligand and the nature of the metal, are discussed. The bibliography includes 267 references.