The syntheses and characterization of a series of binuclear mu-oxalato complexes of the general type [(N)(4)M(C2O4)M(N)(4)](2+), where M is Mn-II, Fe-II, Co-II, Ni-II, Cu-II, and Zn-II, are described. The ligands (N)(4) represent the tetradentate ligands N,N’-bis(2-pyridylmethyl)-1,2-ethanediamine (bispicen, C14H18N4),N,N’-bis(2-pyridylmethyl)1,3-propanediamine (bispictn, C15H2ON4), and N,N’-bis(2-pyridylmethyl)-N,N’-dimethyl-1,2-ethanediamine (bispicME(2)- en, C16H22N4). The lexes have been determined. The manganese complex [(bispicen)Mn(C2O4)Mn(bispicen)l(ClO4)(2) (1a) crystallizes in the noncentrosymmetric orthorhombic space group Pna2(1) with four binuclear formula units in a cell of dimensions a = 21.771 (4), b = 23.650 (5), and c = 7.328 (2) Angstrom. The corresponding Fe(II), Cu(II), and Zn(II) complexes (2a, 5a, and 6a, respectively) are isomorphous with this manganese complex 1a. The complex [(bispicMe(2)en)Mn(C2O4)Mn(bispicMe(2)en)](ClO4)(2)(1c) crystallizes in the centrosymmetric monoclinic space group P2(1)/c With two binuclear formula units in a cell of dimensions a = 9.218 (2) Angstrom, b = 13.189 (2) Angstrom, c = 17.213 (3) Angstrom, and beta = 92.780 (10)degrees. The Co complex [(bispicen)Co- (C2O4)Co(bispicen)](ClO4)(2) . H2O (3a) crystallizes in the triclinic space group with one binuclear formula unit in a cell of dimensions a = 8.832 (2) Angstrom, b = 9.297 (2) Angstrom, c = 13.045 (3) Angstrom, alpha = 108.01 (3)degrees, beta = 98.48 (3)degrees, and gamma = 93.31 (3)degrees. The corresponding Ni(II) analogue, 4a, is isomorphous with this cobalt complex.