From the reaction of Cu(Pht)(H 2 O) (Pht=o-benzene dicarboxylate) with pyrazole (Hpz), four different 1D or 2D Coordination Polymers (CPs), [Cu(Pht)(Hpz) 2 ]·CH 2 Cl 2 , 1, [{Cu(Pht)(Hpz) 4 } 3 ]·3.5Hpz·H 2 O, 2, [{Cu(Pht)(Hpz) 2 } 2 ·0.5H 2 O], 3, and [Cu(Pht)(Hpz) 2 ], 4, where Pht dianions bridge two or three mononuclear Cu(Hpz) x moieties (x=2, 4), as well as the compound [Cu(Pht)(Hpz) 4 ]·MeOH, 5, have been obtained, depending on the solvent employed. All compounds are air stable and have been characterized through elemental analyses and spectral determinations (IR, ESI-MS, magnetic susceptibility) and 1–4 also by single crystal X-ray diffraction studies. The self-assemblies of compounds 1–4 in different solvents generate different 1D and 2D CPs as a consequence of the presence of different crystallization solvent molecules in the supramolecular cavities.