The preparation, the X-ray crystal structure, and the magnetic properties of four 2,2’-bipyrimidine (C6H6N4, bpm)containing copper(II) complexes of formula [Cu-2(bpm)(2)(H2O)(2)(OH)(2)(NO3)(2)].4H(2)O (1), [Cu-2(bpm)(OH)(2)-(NO3)(2)].2H(2)O (2), [Cu-2(bpm)(H2O)(2)(OH)(2)](NO3)(2) (3), and [CU2(bpm)(H2O)(2)(OH)(2)(NO3)(2)].2H2O (4) are reported. Crystallographic data are as follows : 1, triclinic system, space group P $($) over bar$$ 1, a = 7.703(1) Angstrom, b = 7.885(1) Angstrom, c = 11.172(2) Angstrom, alpha = 87.29(1)degrees, beta = 86.85(1)degrees, gamma = 78.17(1)degrees, Z = 1, V = 662.7(2) Angstrom(3); 2, monoclinic system, space group C2/c, a = 33.619(7) Angstrom, b = 13.040(3) Angstrom, c = 7.040(1) Angstrom, beta = 101.90(3)degrees, Z = 8, V = 3019.8(10) Angstrom(3); 3, monoclinic system, space group P(2)1/n, a = 9.316(2) Angstrom, b = 8.286(2) Angstrom, c = 9.693(2) Angstrom, beta = 90.52(2)degrees, Z = 2, V = 748.2(3) Angstrom(3); 4, triclinic system, space group P $($) over bar$$ 1, a = 7.564(2) Angstrom, b = 8.032(2) Angstrom, c = 8.238(2) Angstrom, alpha = 61.33(2)degrees, beta = 88.66(2)degrees, beta = 88.66(2)degrees, gamma = 75.97(2)degrees, Z = 1, V = 423.5(2) Angstrom(3). The structure of 1 is made up of discrete, centrosymmetric bis(mu-hydroxo) copper(II) dimers with bpm as terminal ligand, weakly coordinated water molecules, unidentate nitrate anions, and molecules of water of crystallization. The copper environment in 1 is distorted octahedral with two bridging hydroxo groups and two nitrogen atoms of bpm building:the equatorial plane whereas two oxygen atoms from water and nitrate groups occupy the axial positions. The Cu(1)-OH-Cu(1a) bridging angle is 95.7(1)degrees, and the intramolecular Cu(1)...Cu(1a) separation is 2.881(1) Angstrom. The structures of 2-4 consist of cationic one-dimensional chains of copper(II) ions alternatively bridged by bpm and two hydroxo groups. The electroneutrality is achieved through unidentate (2 and 4) and uncoordinated (3) nitrate groups. Coordinated (3 and 4) and crystallization (2 and 4) water molecules are also present. : 1, triclinic system, space group P $($) over bar$$ 1, a = 7.703(1) Angstrom, b = 7.885(1) Angstrom, c = 11.172(2) Angstrom, alpha = 87.29(1)degrees, beta = 86.85(1)degrees, gamma = 78.17(1)degrees, Z = 1, V = 662.7(2) Angstrom(3); 2, monoclinic system, space group C2/c, a = 33.619(7) Angstrom, b = 13.040(3) Angstrom, c = 7.040(1) Angstrom, beta = 101.90(3)degrees, Z = 8, V = 3019.8(10) Angstrom(3); 3, monoclinic system, space group P(2)1/n, a = 9.316(2) Angstrom, b = 8.286(2) Angstrom, c = 9.693(2) Angstrom, beta = 90.52(2)degrees, Z = 2, V = 748.2(3) Angstrom(3); 4, triclinic system, space group P $($) over bar$$ 1, a = 7.564(2) Angstrom, b = 8.032(2) Angstrom, c = 8.238(2) Angstrom, alpha = 61.33(2)degrees, beta = 88.66(2)degrees, beta = 88.66(2)degrees, gamma = 75.97(2)degrees, Z = 1, V = 423.5(2) Angstrom(3). The structure of 1 is made up of discrete, centrosymmetric bis(mu-hydroxo) copper(II) dimers with bpm as terminal ligand, weakly coordinated water molecules, unidentate nitrate anions, and molecules of water of crystallization. The copper environment in 1 is distorted octahedral with two bridging hydroxo groups and two nitrogen atoms of bpm building:the equatorial plane whereas two oxygen atoms from water and nitrate groups occupy the axial positions. The Cu(1)-OH-Cu(1a) bridging angle is 95.7(1)degrees, and the intramolecular Cu(1)...Cu(1a) separation is 2.881(1) Angstrom. The structures of 2-4 consist of cationic one-dimensional chains of copper(II) ions alternatively bridged by bpm and two hydroxo groups. The electroneutrality is achieved through unidentate (2 and 4) and uncoordinated (3) nitrate groups. Coordinated (3 and 4) and crystallization (2 and 4) water molecules are also present.