| Abstract: | Synthesis, Crystal Structure, and FTIR Spectra of the Oxoniumfluorometallates DienH2(H3O)[AlF6] and DienH2(H3O)[FeF6] Single crystals of the compounds DienH2(H3O)[AlF6] and DienH2(H3O)[FeF6] (Dien = Diethylenediamine or Piperazine) were obtained from aqueous HF solution. The compounds are isotypic and crystallize in the monoclinic space group P21/c, Z = 8 with the unit cell parameters a = 1333.7(3), b = 1261.8(3), c = 1234.5(2) pm, β = 115.79(3)° (Al compound) and a = 1354.0(3), b = 1267.5(3), c = 1255.9(3) pm, β = 115.48(3)° (Fe compound). The crystal structure consists of isolated [MF6]3? anions, H3O+ and DienH22+ cations. The [MF6]3? octahedra are connected via very strong O? H … F and N? H … F-bridges forming a three dimensional network structure. This strong hydrogen bonding was confirmed by the FTIR spectra. |
