The synthesis, crystal structure and properties of the compound [Cu-4(dpk . CH3O)(2)Cl-6](n) (dpk . CH3OH = unimethylated diol of di-2-pyridyl ketone) (1), the first example of a copper(II) polymer having a tetrameric repeating unit with S = 2 ground state is reported. The synthesis of compound 1 has been achieved via the reaction of CuCl2 with dpk in methanol. The base-catalyzed addition results in the formation of a unimethylated diol which may deprotonated. Crystal structure data : [C12H11N2O2Cl3CU2], M(r) = 448.68; triclinic; space group ; a = 7.800(1) (Angstrom); b = 8.946(1) (Angstrom); c = 13.383(1) (Angstrom); alpha = 118.964(3)degrees; beta = 92.693(3)degrees; gamma = 66.824(3)a; Z = 2. Variable temperature magnetic susceptibility measurements indicate the presence of a ferromagnetic behavior with antiferromagnetic coupling below 15 K. The best fit parameters obtained from this model are J(1) = 71.32 cm(-1), J(2) = 1.43 cm(-1), J(3) = 0.07 cm(-1), J(4) = 0 (fixed), zJ = -0.553 cm(-1), and g = 2.1 (fixed). The energy levels obtained from the fitting procedure show a S = 2 ground state. The polycrystalline powder EPR spectra at 4.1 K, show an intense broad signal spread over 3900 G with g = 2.34, indicative of a bulk concentration of copper ions having strong ferromagnetic interaction.