Tris(3-fluorophenyl)antimony dicarboxylates (3-FC 6 H 4 ) 3 Sb[OC(O)R] 2 (R = CH 2 Cl, Ph, CH 2 C 6 H 4 NO 2 -4, C 10 H 15 ): Synthesis and structure

Abstract

Tris(3-fluorophenyl)antimony dicarboxylates (3-FC₆H₄)₃Sb[OC(O)R]₂, R = CH₂Cl (I), Ph (II), CH₂C₆H₄NO₂-4 (III), C₁₀H₁₅ (IV)) have been synthesized with a high yield by the reaction between tris(3-fluorophenyl)antimony and carboxylic acids in ether in the presence of tert-butyl hydroperoxide. The Sb atoms in complexes I–IV have a distorted trigonal bipyramidal coordination with carboxylate ligands in axial positions. The OSbO angles are 176.61(11)° (I), 177.8(2)°, 175.9(3)° (II), 173.25(16)° (III), and 177.84(14)° (IV). The Sb–O and Sb–C_eqv bond lengths are 2.111(3), 2.131(3) and 2.102(5)–2.117(4) Å (I); 2.101(1)–2.547(6) and 2.103(8)–2.132(7) Å (II); 2.035(7), 2.144(6) and 2.116(9)–2.130(10) Å (III); 2.131(5), 2.156(4) and 2.103(2)–2.153(5) Å (IV). The carboxylate ligands show anisobidentate properties, and the Sb⋯О=С distances are 2.804(4), 2.923(4) Å (I), 2.541(8)–2.747(9) Å (II), 2.967(9), 3.007(9) Å (III), and 2.561(9), 2.617(9) Å (IV). The structural organization in crystals is based on weak intermolecular hydrogen bonds H⋯F (2.48–2.64 Å) and H⋯O(=C) (2.55–2.71 Å).