Synthesis and structure of tris(3-fluorophenyl)antimony chloro(pentachlorophenoxide) (3-FC6H4)3SbCl(OC6Cl5)

Tris (3-fluorophenyl)antimony chloro(pentachlorophenoxide) (1) has been synthesized by the interaction of tris (3-fluorophenyl)antimony dichloride with tris (3-fluorophenyl)antimony bis (2,3,4,5,6-pentachlorophenoxide) (1:1 mol.) in benzene. The compound has been identified by IR spectroscopy and X-ray diffraction analysis. The absorption band of the stretching vibrations of the SbC3 fragment at 432 cm-1 is observed in the IR spectrum of compound 1. There is also an intensive absorption band at 1267 cm-1, which characterizes stretching vibrations of the C-O bond. According to the X-ray diffraction analysis the coordination of the antimony atom is trigonal-bipyramidal with the chlorine and oxygen atoms in the axial positions [C24H12OCl6SbF3, M = 707.79; the triclinic system, space group P ; a 9.486(6), b 11.548(7); c 12.382(11) Å; α 73.61(2), β 87.03(3), γ 84.221(19) degrees; V 1294.2(17) Å3; Z 2; µ 1.724 mm-1; F(000) 668.0; crystal size 0.26´0.22´0.11 mm; 2θ for data collection 5.7-62.22 degrees; index ranges -13 ≤ h ≤ 13, -16 ≤ k ≤ 16, -17 ≤ l ≤ 17; total reflections 79173; independent reflections 8254; Rint 0.0560; variables 317, GOOF 1.021; R 1 = 0.0482; wR 2 = 0.1167; residual electron density 1.91/-0.56 e/Å3]. The OSbCl axial angle in the molecule of compound 1 is 179.14(8)°. The sum of the CSbC angles in the equatorial plane is 360°, while the values of the individual angles vary in the interval 113.49 (15)°-126.16 (15)°. The Sb-O axial bond length is shorter than the Sb-C equatorial bond lengths and equals 2.092 (3) Å. This pattern is characteristic of most triaryl­antimony diaroxides. The formation of the compound 1 crystal structure is due to the formation of weak intermolecular contacts C-H×××Cl 2.89 Å and F×××Cl 3.08, 3.11 Å. Complete tables of coordinates of atoms, bond lengths and valence angles are deposited at the Cambridge Structural Data Bank (No. 1849662; deposit@ccdc.cam.ac.uk; http://www.ccdc. cam.ac.uk).