Complexes Ar3Sb[OC(O)C6HF4-2,3,4,5]2, Ar3Sb[OC(O)CF2Br]2, and Ar3Sb[OC(O)CF2CF2CF3]2 (Ar = C6H3OMe-2-Br-5): Synthesis, Structure, and Photochemical Properties

The tris(5-bromo-2-methoxyphenyl)antimony complexes with 2,3,4,5-tetrafuorobenzoic, bromodifluoroacetic, and heptafluorobutyric acids have been synthesized by oxidative addition reactions and structurally characterized. According to X-ray diffraction data, the products of these reactions are triarylantimony dicarboxylates with the general formula (2-MeO-5-Br-C6H3)(3)Sb(OC(O)R)(2), where R = C6HF4-2,3,4,5 (1), CF2Br (2), CF2CF2CF3 (3). The antimony atoms in molecules of complexes 1-3 have trigonal bipyramidal coordination with the oxygen atoms of carboxylate ligands in axial positions. The average lengths are 2.119 (1), 2.106 (2), and 2.109 angstrom (3) for equatorial Sb-C bonds and 2.112 (1), 2.104 (2), and 2.118 angstrom (3) for Sb-O bonds. The OSbO angles are 177.5(2)degrees (1), 172.6(4)degrees (2), and 176.8(3)degrees (3), and the OSbC angles are 89.3(3)degrees-93.5(3)degrees (1), 84.4(5)degrees-97.0(5)degrees (2), and 84.2(3)degrees-98.9(3)degrees (3). The photocatalytic activity of the synthesized complexes has been studied using the photodestruction of organic dyes, namely, Methylene Blue and Methyl Violet as an example.