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This study describes supramolecular assemblies of Cu(II) and Ni(II) 2,2′-bipyridine cations with dimeric tartratogermanate anions, namely [CuCl(bipy)2]2[Ge2(OH)2(Tart)2]·4H2O (I) and [Ni(bipy)3]4[{Ge2(OH)2(Tart)2}3Cl2]·15H2O (II). The compounds were characterized by elemental analysis, mass-spectrometry, IR-spectroscopy and X-ray analysis. The chloride ion coordinates to the Cu atom in cation I and two chloride ions together with the [Ge2(OH)2(Tart)2]2− anion neutralize the charge of the cation in II. The coordination polyhedra of the Ge atoms are trigonal bipyramids in the structures of I and II. The coordination polyhedra of two symmetrically independent [CuCl(bipy)2]1+ cations are distorted trigonal bipyramids in the structure of I, whilst the coordination polyhedra of the Ni cations in II are octahedral.

Five heterometallic mixed-ligand cation-anionic complexes perspective for creation of new effective non-toxic drugs [Fe(phen)3]2[Sn2(µ-Tart)2(H2Tart)2]·2H2O (I), [Co(phen)3]2[Sn2(µ-Tart)2(H2Tart)2]·8H2O (II), [Ni(phen)3]2[Sn2(µ-Tart)2(H2Tart)2]·2H2O (III), [Cu(phen)3]2[Sn2(µ-Tart)2(H2Tart)2]·2H2O (IV), [Zn(phen)3]2[Sn2(µ-Tart)2(H2Tart)2]·6H2O (V) with two types of ligands: ditopic polydentate tartaric acid (Tart) and cyclic bidentate 1,10-phenanthroline (phen), p-(Sn) and d-metals (Fe, Co, Ni, Cu, Zn) in their composition were synthesized. The studied complexes I–V are isostructural and contain complex anion [Sn2(µ-Tart)2(H2Tart)2]4-, polyhedrons of two Sn atoms are octahedrons, that are formed by dimeric Sn2(Tart4-)2 fragment and bidentate coordination of two terminal H2Tart2-. All cations in I-V have similar structures [Me(phen)3]2+ with Me = Fe, Co, Ni, Cu, Zn. The present study compares electronic analogues Sn (IV) and Ge (IV) and reveals structural features of the novel tartratostannates and previously obtained tartratogermanates with the same compositional units.