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Oxalic Acid Bridge, Dimeric Complex, X-Ray Data, Antiferromagnetic Coupling [LCu{ji-(0 H)2(C20 2)}CuL](C1 0 4 )2, (HL = N,N-dimethyl N-propylsalicylald-imine) was synthesised and its crystal structure was determined. C26H36CI2CU2N4O 14, triclinic space group Pi with a = 9.288(9), b = 10.016(11), c = 10.09(2) Ä and a = 101.05(11), ß = 108.22(10), 7 = 110.22(10)°, V = 787(2) Ä 3, Z = 2. Two copper(II) ions in a distorted square-planar coordination are bridged by an oxalic acid molecule to form dinuclear units. The copper(II) centres are separated by 5.2 A and antiferromagnetically coupled (J = -4 7 8 cm" 1), which follows from temperature-dependent magnetic susceptibility measurements in the range 12 to 300 K.