Three novel heterotrinuclear complexes have been synthesized and characterized, namely {[Gd(L)2]2[Cu(pba)]}(ClO4)4, where pba denotes 1,3-propylenebis (oxamato), L stands for 1,10-phenanthroline (phen), 5-nitro-1,10-phenanthroline (NO2-phen) or 2,2'-bipyridyl (bpy). The temperature dependence of the magnetic susceptibility of {[Gd(phen)2-(ClO4)]2[Cu(pba)]}(ClO4)2.2H2O has been studied in the 4~300K range, giving the exchange intergral J=3.56cm^-^1. This indicates a weak ferromagnetic interaction between the copper (Ⅱ) and gadolinum (Ⅲ) ions.

Key words: COPPER COMPLEX, POLYNUCLEAR COMPLEX, BIPYRIDINE, PHENANTHROLINE, GADOLINIUM COMPLEX, FERROMAGNETISM, INTERACTIONS