Four new heterotrinuclear complexes have been synthesized, namely {[Mn(L)2]2[Cu(pba)]}(ClO4)2 where pba denotes propylene-1, 3-bis (oxamato) and L states for 1, 10-phenanthroline (phen), 5-nitro-1, 10- phenanthroline (NO2-phen), 2, 2'-bipyridyl (bpy), 4, 4'-dimethyl-2, 2' -bipyridyl (Me2bpy). The temperature depedence of the magnetic susceptibility of {[Mn(phen)2]2[Cu(pba)]}(ClO4)2.H2O has been studied in the 4.2~300K range, giving the exchange integral J=-41.5cm^-^1. The XMT vs. T Plot exhibits a minimum at about 175K, which is the characteristic of this kind of coupled polymetallic complex with an irregular spin state structure.

Key words: COPPER COMPLEX, POLYNUCLEAR COMPLEX, PHENANTHROLINE P, MAGNETISM, MANGANESE COMPLEX, BIPYRIDINE P