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The reaction of iron(Ⅲ)anions,FeCl 3 and Fe 2(SO 4)3 with tris(hydroxymethyl)aminomethane(Tris)in a 1∶2 molar ratio affords the new coordination compounds NH 4[Fe 2(Tris)2(H 2O)4(SO 4)](Ⅰ)and NH 4[Fe(Tris)2(H 2O)2](Ⅱ).These compounds were characterized by