Complexes Ar3Sb(ONCHC6H4NO2-2)2 · 0.5C6H6, Ar3Sb(ONCHC6H4NO2-3)2 · 2C6H6 and Ar3Sb(OC(O)CH2C6H4F-3)2 (Ar = C6H3OMe-2-Br-5): Synthesis and Structure

Abstract

The reactions of tris(5-bromo-2-methopxyphenyl)antimony with 2-, 3-nitrobenzaldoximes and 3-fluorophenylacetic acid in the presence of tert-butyl hydroperoxide with the formation of products with the general formula (2-MeO-5-Br-C₆H₃)₃SbХ₂, where Х = ONCHC₆H₄NO₂-2 (I), ONCHC₆H₄NO₂-3 (II), OC(O)CH₂C₆H₄F-3 (III), have been studied. According to X-ray diffraction data, complexes I and II crystallize in the form of solvates (with 0.5C₆H₆ and 2C₆H₆, respectively). The Sb atoms in molecules of complexes I–III have a trigonal bipyramidal coordination with the carbon atoms of aryl radicals in the equatorial plane and the oxygen atoms of oximate and carboxylate ligands in axial positions. The ОSbО axial angles are 173.47(18)° (I), 170.71(9)° (II), and 173.96(10)° (III), and the OSbC angles variate within 86.2(2)°–95.1(2)° (I), 81.31(13)°–94.35(12)° (II), and 83.12(12)°–96.50(13)° (III). The ranges of Sb–C band lengths are 2.097(6)–2.109(6) Å (I), 2.115(4)–2.137(4) Å (II), and 2.119(4)–2.122(3) Å (III), and the Sb–O bond are 2.050(5), 2.055(5) Å (I), 2.058(3), 2.093(3) Å (II), and 2.111(3), 2.110(3) Å (III).