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The Elusive Tetrasamarium‐oxide‐hexabromide, Sm 4 OBr 6
Author(s) -
Hammerich Stefanie,
Pantenburg Ingo,
Meyer Gerd
Publication year - 2006
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200600134
Subject(s) - crystallography , crystal structure , oxide , tantalum , bromide , tetrahedron , hexagonal crystal system , halide , materials science , chemistry , inorganic chemistry , metallurgy
Black single crystals of tetrasamarium(II)‐oxide‐hexabromide, Sm 4 OBr 6 , were obtained from a reaction of SmBr 3 , Sm 2 O 3 and Na in a sealed tantalum container at 750 °C. Sm 4 OBr 6 crystallizes in the hexagonal space group P6 3 mc (Z = 2, a = 985.89(9), c = 753.50(6) pm, R = 0.035 for all data) as do all M 4 OX 6 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 K 6 HgS 4 /Na 6 ZnO 4 with K 6 HgS 4 = Br 6 OSm 4 . The {OSm 4 } tetrahedron is surrounded by 18 bromide ligands according to {OSm2Sm1 3 }(μ 1 ‐Br1 6 )(μ 1 ‐Br2 3 )(μ 2 ‐Br1 3 )(μ 2 ‐Br2 3 )(μ 3 ‐Br2 3 ). These bromide ligands bridge to other such tetrahedra to allow for a three‐dimensional structure.