Anthracen- und Phenanthren-Cobalt-Verbindungen mit Trimethylphosphan-Liganden / Anthracene and Phenanthrene Cobalt Compounds Containing Trimethylphosphane Ligands

Abstract

Anthracene and phenanthrene complexes of zerovalent cobalt, Co(Cl 4 H 10 )(PMe 3 ) 3 , are obtained by substitution of olefin in Co(olefin)(PMe 3 ) 3 (olefin = propene, cyclopentene). Ethene replaces the η 2 -bonded aromatic molecules. Substitution labile ligands L′ in hydridocobalt complexes CoH(L′)(PMe 3 ) 3 (L′ = N 2 , C 4 H 8 ) give way to an anthracene or phenanthrene ligand and can in turn be replaced by carbon monoxide. η 4 -Coordinated anthracene in Co[Sn(C 6 H 5 ) 3 ](C 14 H 10 )(PMe 3 ) 2 is not replaced by CO under normal conditions. In η 2 -coordinated anthracene the bond between coordinated C-atoms in ring positions 2 and 3 is elongated by 8.9 pm when compared with free anthracene, deviations from planarity of six-membered rings are slight. η 4 -Coordinated anthracene contains a naphthalin-type planar part and. in the coordinated ring with the longer CC-bonds, shows a folding away from the cobalt atom.