
Zeitschrift fur Anorganische und Allgemeine Chemie p. 1799 - 1806 (1999)
Update date:2022-08-04
Topics:
Lang
Lauster
Klinkhammer
Schmidt
Benzylphosphonic acid monoalkylesters react with antimony(V) chloride and water to yield Cl3SbO(OH)[(C6H5CH2)RPO 2]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((C6H 5CH2)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.
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