Synthesis, characterizations and crystal structures of new organoantimony(V) complexes with various isomers of fluoromethylbenzoate ligands

Six new organoantimony(V) complexes containing various isomers of fluoromethylbenzoate ligands [RC6H3COO]2SbPh3 and [RC6H3COO]SbPh4 [R = 3-F-4-(CH3) (1, 4), 4-F-2-(CH3) (2, 5), 5-F-2-(CH3) (3, 6)] have been synthesized by the reactions of triphenylantimony(V) dichloride or tetraphenylantimony(V) bromide with various isomers of fluoromethylbenzoate ligands in 1:2 or 1:1 stoichiometries. All the complexes have been characterized by elemental analysis, IR and NMR [1H, 13C and 19F] studies. The crystal structures of complexes 1, 3, 4, 5 and 6 have been determined by X-ray single crystal diffraction. The structure of complexes show that the five-coordinated antimony(V) atom adopts a distorted trigonal bipyramidal geometry. Furthermore, weak but significant intermolecular C–H···O, C–H···F hydrogen bonds, C–H···pi stacking lead to aggregation and assembly of these complexes into 1D and 2D supramolecular frameworks.

Graphical abstractSix new organoantimony(V) complexes containing various isomers of fluoromethylbenzoate ligands [RC6H3COO]2SbPh3 and [RC6H3COO]SbPh4 [R = 3-F-4-(CH3) (1, 4), 4-F-2-(CH3) (2, 5), 5-F-2-(CH3) (3, 6)] have been synthesized by the reactions of triphenylantimony(V) dichloride or tetraphenylantimony(V) bromide with various isomers of fluoromethylbenzoate ligands in 1:2 or 1:1 stoichiometries. All the complexes have been characterized by elemental analysis, IR and NMR [1H, 13C and 19F] studies. The crystal structures of complexes 1, 3, 4, 5 and 6 have been determined by X-ray single crystal diffraction. The structure of complexes show that the five-coordinated antimony(V) atom adopts a distorted trigonal bipyramidal geometry. Furthermore, weak but significant intermolecular C–H···O, C–H···F hydrogen bonds, C–H···Pi stacking lead to aggregation and assembly of these complexes into 1D and 2D supramolecular frameworks.Figure optionsDownload full-size imageDownload as PowerPoint slide