Abstract: Four copper(Ⅱ)complexes of Schiff bases of symmetical triazole and salicylaldehyde were synthesized, namely[Cu(L₁)Cl₂](Ⅰ)and trinuclear complexes [Cu₃(L₂～L₄)₂Cl₄]· nH₂O(Ⅱ～Ⅳ)where L₁, L₂, L₃ L₄ are Schiff bases of 4-amino 1,2,4-triazole, 4-amino-3,5-dimethyl-1,2,4-triazole, 4-animo-3,5-diethyl-1,2,4-triazole and 4-amino-3,5-dihydroxymethyl-1,2,4-triazole, respectively. The complexes were characterized by elemental analysis, conductivity, IR spectrum, thermoanalysis, electronic spectrum, ESR and susceptibility measurements. The complexes have been proposed to have distorted square configuration. The results of variable temperature magnetic susceptibility of complex(Ⅱ)indicated the weak antiferromagnetic spin exchange interaction between the copper(Ⅱ)ions. J =-18.9 cm^-1, g =2.08, F =2.7×10^-3. The biological activity tests of the complexes showed that they are capable of inhibiting B cell.

Key words: trinuclear copper complex, antiferromagnetic interaction, biological activity