Stable Two-Legged Parent Piano-Stool and Mixed Diborabenzene-E 4 (E=P, As) Sandwich Complexes of Group 8.
Maximilian DietzMerle ArrowsmithStephan ReichlLeonardo I Lugo-FuentesJosé Oscar Carlos Jimenez-HallaManfred ScheerHolger BraunschweigPublished in: Angewandte Chemie (International ed. in English) (2022)
A cyclic alkyl(amino)carbene-stabilized 1,4-diborabenzene (DBB) ligand enables the isolation of 18-electron two-legged parent piano-stool Fe 0 and Ru 0 complexes, [(η 6 -DBB)M(CO) 2 ], the ruthenium complex being the first of its kind to be structurally characterized. [(η 6 -DBB)Fe(CO) 2 ] reacts with E 4 (E=P, As) to yield mixed DBB-cyclo-E 4 sandwich complexes with planar E 4 2- ligands. Computational analyses confirm the strong electron-donating capacity of the DBB ligand and show that the E 4 ligand is bound by four equivalent Fe-P σ bonds.