Strategy for the synthesis of Di- and polymer tartratogermanates with single-charge cations. Crystal structures of K2[Ge2(OH)2(μ-Tart)2] · 4.5H2O and (NH4)2n [Ge2(μ-O)(μ-Tart)2] n · nMeCN · nH2O

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Tartratogermanates of alkaline metals and ammonium are synthesized for the first time using different solvents (water, acetonitrile) and starting reagents (GeO2 and GeCl4): dimeric Kat2[Ge2(OH)2(μ-Tart)2] · 4.5H2O (H4Tart is D-tartaric acid, Kat = Na (I) and K (II)) and polymer (NH4)2n[Ge2(μ-O)(μ-Tart)2]n · nCH3CN · nH2O (III). The complexes are characterized by elemental analysis, IR spectroscopy, and X-ray diffraction analysis. The structure of complex II contains binuclear isolated [Ge2(OH)2(μ-Tart)2]2-complexes. In complex III, the oxo ligands join the binuclear fragments into polymer chains.