Composés d'addition de SbF5 avec H2O et HF. Formation d'ions hydronium

Abstract

A differential thermal analysis study of solutions of SbF5 in H2O and HF has enabled us to determine the thermal treatments required to obtain the stable crystalline phases: SbF5•2H2O, 4SbF5•5H2O, SbF5•H2O, 3SbF5•2H2O, and SbF5•HF•2H2O.The SbF5 adducts were characterized by X-ray powder diagrams.The vibrational spectra of SbF5•2H2O and SbF5•HF•2H2O are consistent with the ionic structures H3O+SbF5OH− and H5O2+SbF6−.The other hydrates are simple donor-acceptor complexes with the structure H2O → SbF5, in which one water molecule is coordinated to the SbF5 and the others are bound by hydrogen bonds to the coordinated water molecule.