From a wide row of investigated by us homo- and heterometal coordination compounds of Ge(IV), Sn(IV) with hydroxycarbonic acids only three are polymeric: [Ba(Н2О)4][Ge2(- Tart)2(-OH)2]5H2O (I), {[Ge(-НCit)2Ba(H2O)3]3H2O}n (II), [Sn4Cu8.5(HXylar)2(Xylar)4O2(OH)(H2O)12.5]17.2H2O (III) (H4Tart – tartaric, H4Cit – citric, H5Xylar – xylaric acids). Influence of as ligand, so complexformer on structure of being formed coordination polymer is accurately traced on their example. The structural units of crystal I are polymeric {[Ge2(-Tart)2(-ОН)2] 2}∞ anions, hydrated [Ва(H2O)4] 2+ cations, and crystal water molecules. In [Ge2(-Tart)2] dimer two completely deprotonated Tart4- ligands act as tetradentate bis(chelate) bridges between two crystallographically independent germanium atoms with similar geometries. Two carboxyl and two hydroxyl oxygen atoms of two crystallographically independent Tart4- ligands are coordinated to each Ge atom. The polyhedron of each germanium atom is completed to an octahedron by two bridging OH groups, which leads to formation of a polymeric chain along the 41 axis. The coordination polyhedron of Ba2+ cations (CN 8) is a severely distorted square antiprism. Each of the square faces is formed by two carbonyl oxygen atoms of two Tart4- ligands at the Ge atoms and two oxygen atoms of water molecules. In I between polymeric chains of complex anions there are stacks of Ba cations and crystal water molecules. All structural units are bound by hydrogen bonds to form a framework. The structural units of crystals II are two crystallographically independent centrosymmetric complex anions [Ge(НCit)2] 2 , a Ba2+ cation, and six water molecules. Complex II has a chain structure. In the chain Ba2+ ions link crystallographically independent [Ge(НCit)2] 2 anions through oxygen atoms of the pentadentate tris(chelato)-3- bridging ligands НСit3 . The germanium atom is at the center of a slightly distorted octahedron (facial isomer) and is coordinated by three pairs of oxygen atoms of three types from two tridentate bis(chelating) НСit3 ligands: hydroxyl, -carboxylate and -carboxylate atoms. The second protonated -carboxylate arm of each of the two НСit3 ligands does not participate in the coordination with the Ge atom. The coordination polyhedron of the Ba2+ cation is formed by two carboxylate oxygen atoms of the -arm monocoordinated by the Ge atom and the carbonyl oxygen atom of the protonated -arm (uncoordinated) of the HCit3- ligands from each of the anions. Thus, the protonated HCit3 ligand is a tridentate mono(chelating) bridging with respect to the Ba2+ ions. The coordination number of barium is completed to nine by three oxygen atoms of water molecules. In I and II carboxyl groups carry out not mono-, but bi- (in I) and three- (in II) dentate-bridging functions, however coordinated form of germanium is different in them, coordination number of Ва cation, which enters into a polymeric chain in II, and in I – no. The structure III appeared the most difficult, it is possible to allocate centersymmetric heterometal fragments in it [Sn4Cu6(HXylar)2(Xylar)4O2(H2O)6] (А), to which atoms Cu1-3 and Sn1,2 enter. Bridges Cu4(OH)0.5(H2O)2.5 unite units А in chains, and bridges Cu5(OH)(H2O) connect fragments А in perpendicular to chains layers. In common atoms of Cu4,5 form a framework, in which emptiness there are crystal water molecules.