Abstract
Organometallic coordination chemistry is dominated by the pervasive cyclopentadienide (Cp−) ligand and its benzannulated derivatives indenide (Ind−) and fluorenide (Flu−). However, in the past decades a diverse coordination chemistry involving higher benzannulated homologues has developed. In this review, the synthesis and electronic structure of π-extended Cp-ligands will be discussed, as well as the factors that affect complex stability. An overview of known transition metal complexes containing both ‘classic’ benzannulated Cp-ligands, and ‘non-classic’ ligands derived from polycyclic arenes will be given.
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