Structure of bis(citrato)germanates with different types of cations: (Hphen)2[Ge(HCit)2·3H2O], [CuCl(phen)2]2[Ge(HCit)2·6H2O], where H4Cit is citric acid, phen IS 1,10-phenanthroline

Abstract

The procedures are developed and the complexation products are preparatively isolated from GeO₂–H₄Cit-phen–CH₃CN–H₂O (I) and GeO₂–H₄Cit–CuCl₂-phen–C₂H₅OH–H₂O (II) systems (phen is 1,10-phenanthroline, H₄Cit is citric acid). The (Hphen)₂[Ge(HCit)₂]·3H₂O (I) and [Cu(phen)₂Cl]₂[Ge(HCit)₂]·6H₂O (II) complexes are characterized by elemental analysis, IR spectroscopy, and single crystal X-ray diffraction. The compounds are formed from centrosymmetric octahedral [Ge(HCit)₂]^2– anions, Hphen⁺ (I) and [Cu(phen)₂Cl]⁺ (II) cations, and crystallization water molecules. The structural units in the crystals are linked via a system of hydrogen bonds.