[Yb 3 OBr 4 {N(SiMe 3 ) 2 } 3 (THF) 3 ], ein Amido‐Komplex des Ytterbiums mit clusterähnlichem Aufbau

[Yb 3 OBr 4 {N(SiMe 3 ) 2 } 3 (THF) 3 ], an Amido Complex of Ytterbium with a Clusterlike Structure The title compound has been prepared from YbBr 3 and NaN(SiMe 3 ) 2 in THF suspension, forming yellow single crystals from hexane solutions which were characterized by a crystal structure determination. Space group P 1 , Z = 2, lattice dimensions at −100°C: a = 1085.4(1), b = 1410.2(1), c = 1912.0(1) pm; α = 78.62(1)°, β = 80.61(1)°, γ = 73.45(1)°, R = 0.025. In the molecular structure of [Yb 3 OBr 4 {N(SiMe 3 ) 2 } 3 (THF) 3 ] the three ytterbium atoms together with the μ 3 ‐oxygen atom and a μ 3 ‐bromine atom form a distorted trigonal bipyramid. In addition, three μ 2 ‐Br atoms coordinate the Yb atoms in the equatorial plane, whereas the THF molecules and the N(SiMe 3 ) 2 − ligands are terminally coordinated, thus forming a distorted octahedrally surrounding of the Yb atoms.