Paprocki, ValerieHrobárik, PeterHarriman, Katie L. M.Luff, Martin S.Kupfer, ThomasKaupp, MartinMurugesu, MuraleeBraunschweig, Holger2021-06-032021-06-032020-04-240044-8249https://depositonce.tu-berlin.de/handle/11303/13193http://dx.doi.org/10.14279/depositonce-11988The π coordination of arene and anionic heteroarene ligands is a ubiquitous bonding motif in the organometallic chemistry of d-block and f-block elements. By contrast, related π interactions of neutral heteroarenes including neutral bora-π-aromatics are less prevalent particularly for the f-block, due to less effective metal-to-ligand backbonding. In fact, π complexes with neutral heteroarene ligands are essentially unknown for the actinides. We have now overcome these limitations by exploiting the exceptionally strong π donor capabilities of a neutral 1,4-diborabenzene. A series of remarkably robust, π-coordinated thorium(IV) and uranium(IV) half-sandwich complexes were synthesized by simply combining the bora-π-aromatic with ThCl4(dme)2 or UCl4, representing the first examples of actinide complexes with a neutral boracycle as sandwich-type ligand. Experimental and computational studies showed that the strong actinide–heteroarene interactions are predominately electrostatic in nature with distinct ligand-to-metal π donation and without significant π/δ backbonding contributions.en540 Chemie und zugeordnete Wissenschaftenactinidesbondingboronheterocyclesπ complexesArticle1521-3757