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A new tetranuclear square compound (H3O)[Sm2Co2(CDTA)2(DMF)2 (μ4-O) (H2O)6]ClO4 was synthesized through the assembly reaction of Co2+ , Sm3+ and trans-1,2-cclohexylenedinitrilotetraacetic acid (H4CDTA) in aqueous solution. X-ray crystal structural analysi