The title mononuclear cobalt(II) complex [Co(DENP)2(MeOH)2](2NO3 (DENP = 2-[2-(diethylamino)ethyliminomethyl]-4-nitrophenolate) was prepared and characterized by elemen- tal analysis, IR and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P with a = 8.297(1), b = 11.075(2), c = 11.134(2) , α = 69.69(1), β = 70.97(2), γ = 84.02(2)o, Z = 1, V = 907.0(4) 3, Dc = 1.424 g/cm3, Mr = 777.66, λ(MoKα) = 0.71073 , μ = 0.548 mm-1, F(000) = 409, R = 0.0628 and wR = 0.1734. The complex consists of a [Co(DENP)2- (MeOH)2]2+ cation and two disordered nitrate anions. The Co atom, lying at the inversion centre, is six-coordinated by two DENP ligands and two MeOH molecules in an octahedral geometry. The molecules in the crystal are linked through intermolecular O-HO, O-HN and N-HO hydrogen bonds, forming chains parallel to the b axis. The title mononuclear cobalt (II) complex [Co (DENP) 2 (MeOH) 2] (2NO3 (DENP = 2- [2- diethylamino) ethyliminomethyl] -4-nitrophenolate was prepared and characterized by elemen- tal analysis, IR The crystal belongs to the triclinic system, space group P with a = 8.297 (1), b = 11.075 (2), c = 11.134 (2) β = 70.97 (2), γ = 84.02 (2) o, Z = 1, V = 907.0 (4) 3, Dc = 1.424 g / cm3, Mr = 777.66, λ (MoKα) = 0.71073 μ, μ = 0.548 The complex consists of a [Co (DENP) 2- (MeOH) 2] 2+] cation and two disordered nitrate anions. The Co atom, lying at the inversion center, is six-coordinated by two DENP ligands and two MeOH molecules in an octahedral geometry. The molecules in the crystal are linked through intermolecular OHO, OHN and NHO hydrogen bonds , forming chains parallel to the b axis.