Abstract
AbstractBlack single crystals of tetrasamarium(II)‐oxide‐hexabromide, Sm4OBr6, were obtained from a reaction of SmBr3, Sm2O3 and Na in a sealed tantalum container at 750 °C. Sm4OBr6 crystallizes in the hexagonal space group P63mc (Z = 2, a = 985.89(9), c = 753.50(6) pm, R = 0.035 for all data) as do all M4OX6 type oxide halides with M = Ca,Sr,Ba,Eu,Sm,Yb and X = Cl,Br,I, as far as they have been obtained. The crystal structure is also the anti‐type of K6HgS4/Na6ZnO4 with K6HgS4 = Br6OSm4. The {OSm4} tetrahedron is surrounded by 18 bromide ligands according to {OSm2Sm13}(μ1‐Br16)(μ1‐Br23)(μ2‐Br13)(μ2‐Br23)(μ3‐Br23). These bromide ligands bridge to other such tetrahedra to allow for a three‐dimensional structure.
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