Porous metal organic-frameworks (MOFs) and coordination polymers (CPs) are of great demand nowadays because of their potential applications such as gas storage and separation, magnetism, catalysis and adsorption. These solids combine a high pore volume, a regular porosity, and the presence of tunable organic groups within the framework which allow an easy modulation of the size of the pores. Polycarboxylates are often employed as bridging ligands to construct porous CPs due to their versatile coordination modes and high structural stability. Herein, we report two recent examples of mixed-ligand 2D coordination polymeric architectures (Figure) based upon binuclear Co(II) building units, {[Co(bdc)(Nia)2].DMF}n I and {[Co2(μ2-OH)(bdc)4(SNia) 2(H2O)(DMF)].DMF.H2O}n II, where H2bdc=benzene-1,4-dicarboxylic acid; Nia=nicotinamide; S-Nia=thioisonicotinamide; DMF= N,N-dimethylformamide: I II Compound I crystallizes in the non-centrosymmetric tetragonal space group I41cd: a=18.0026, b=18.0026, c=28.4456 Å. Each Co(II) atom in the binuclear unit is coordinated by four oxygen and two nitrogen donors in a distorted octahedral arrangement, with two oxygen atoms from chelating bis-bidentate carboxyl groups and two oxygen atoms from two bridging bidentate carboxyl group. The axial positions are completed by two pyridine nitrogen atoms from the neutral Nia ligands. The bridging terephthalate anions are responsible for the 2D square grid extension with the diagonal dimensions of meshes of 15.185 x 15.508 Å. Compound II crystallizes in the centrosymmetric triclinic space group P-1: a=10.6132, b=13.4256, c=17.8366 Å, α=78.860, β=76.420, γ=72.302º. The μ2-OH bridged binuclear core contains two crystallographically distinct cobalt(II) ions: to Co(1) metal ion coordinate single molecules of DMF, H2O, and S-Nia, and two bis-bidentate bridging bdc anions; to Co(2) metal ion coordinate one S-Nia molecule, two bis-monodentate and two bridging bis-bidentate bdc anions. Similar to I the bdc anions are responsible for the 2D grid coordination polymer with the diagonal dimensions of the meshes of 14.362 x 17.837 Å. The both solids demonstrate the very high cumulative solvent uptake indicated by the 1826 Å3 of the free volume (or 19.8% of total volume cell) for I and 735 Å3 (or 31.5%) for II after the guest molecules evacuation.