Synthesis of new antimony(III) and bismuth(III) aryl compounds: Crystal and molecular structure of tris(5-bromo-2-methoxyphenyl)antimony

Tris(5-bromo-2-methoxyphenyl)antimony (I) (yield, 85%) and tris(5-bromo-2-methoxyphenyl)bismuth (II) (yield, 81%) were obtained by reacting 5-bromo-2-methoxyphenyllithium with antimony(III) chloride and bismuth(III) chloride, respectively. According to X-ray diffraction data, the antimony atom in I is highly coordinated. The Sb-C bonds lengths are 2.160(1) Å, 2.163(1) Å, and 2.157(2) Å; the Sb…O distances are 2.985(1) Å, 3.051(1) Å, and 3.052(1) Å. The CSbC bond angles vary in the range of 92.19(6)°-94.52(6)°. Molecules of I are linked via Sb(A)…Br(B) intermolecular contacts (3.742(2) Å) to form polymer chains.