Synthesis and Structure of Frame Xylaratogermanate Salts with Protonated Phenanthroline and Its Complexes with Fe(III) and Ni(II) as Cations

Resumo

Synthesis procedures have been developed for new supramolecular xylaratogermanate salts with different cations: (HPhen)₄[(OH)₂Ge₂(µ-HXylar)₄Ge₂(µ-OH)₂] · 13H₂O (I), [Fe(Phen)₃]₂[(OH)₂Ge₂(µ-HXylar)₄Ge₂(µ-OH)₂] · 6H₂O · C₂H₅OH (II), [Ni(Phen)₃]₂[(OH)₂Ge₂(µ-HXylar)₄Ge₂(µ-OH)₂] · 8H₂O (III). The compounds have been studied by X-ray diffraction, IR spectroscopy, and thermogravimetry. Their molecular and crystal structure has been determined. Compounds I–III include the same tetrameric μ-dihydroxyxylaratogermanate anion [(OH)₂Ge₂(µ-HXylar)₄Ge₂(µ-OH)₂]^4– with ditopic ligand, in which one of three hydroxyl groups does not coordinate to germanium(IV) but forms intramolecular hydrogen bond.