| The syntheses of complexes Ba[M(nta)Cl]·3H2O (M = Cu2+, Co2+, Ni2+) and [M(H2O)6]n[Cu2(nta)2]n·2nH2O (M=Co2+, Ni2+) were investigated in the system, the results show that: the substitution of two different transition-metal ions between the complexes of Ba[M(nta)Cl]·3H2O(M=Cu2+, Co2+, Ni2+)and copper sulfate pentahydrate had reacted in the solution, and a new polymeric dinuclear copper(Ⅱ) nitrilotriacetate was synthesized. At the same time, the synthese ways and structure character were discussed in the paper respectively.
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