Hybrid amidinates and guanidinates of main group metals

• Main group metal complexes with amidinate and guanidinate ligands with an additional functional/donor group are reviewed.
• Complexes reveal various structures and ligand coordination modes.
• The survey of selected NMR spectra parameters is provided.

Complexes of main group metals containing amidinate and guanidinate ligands with an additional functional/donor group are reviewed. Amino-, imino-, amido-, alkoxy-, phenoxy-, carboranyl- and carbene-amidinates along with metal amidinates and a heterocyclic moiety, guanidinates(1−) containing an amino group and a doubly deprotonated guanidinates reveal various structures and ligand coordination modes such as monodentate–anisobidentate–isobidentate–tridentate. The survey of chemical shifts of the central carbon atoms in 13C NMR spectra is provided. Some of those complexes are especially applicable in ring opening polymerization of cyclic esters, lactones and polymerization of olefins.

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