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Wasserstoffbrückenbindungen in zweikernigen μ-Hydroxobis[trichloroantimon(V)]-Komplexen mit Phosphatbzw. Phosphonatgruppen als überbrückende Liganden
Authors:G Lang  M Lauster  K W Klinkhammer  A Schmidt
Abstract:Hydrogen Bonds in Binuclear μ-Hydroxo-bistrichloroantimony(V)] Complexes with Phosphate or Phosphonate Groups as Bridging Ligands Benzylphosphonic acid monoalkylesters react with antimony(V) chloride and water to yield Cl3SbO(OH)(C6H5CH2)RPO2]SbCl3 · H2O ( 1 : R = OCH3; 2 : R = OC2H5). With difluoro phosphoric acid only Cl3SbO(OH)(F2PO2)SbCl3 ( 3 ) can be isolated. The crystal and molecular structures of 1 to 3 were determined. 1 and 2 both crystallizing orthorhombic in the space group Pnma are hydroxonium salts H3O+Cl3SbO2((C6H5CH2)RPO2)SbCl3]. Strong hydrogen bridges link cations and anions to chains. One of the hydrogen atoms of the cation makes a weak but important OH/π interaction to the para C atom of the benzyl group. In 3 (monoclinic, P21/n) the molecules are connected by hydrogen bridges to fourfold δ and helices λ. In solution there is a rapid intermolecular exchange of protons. IR and NMR data are communicated and briefly discussed.
Keywords:Binuclear antimony(V) complexes  Structure  Hydrogen bonding
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