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Three coordination polymers([Zn(H2biim)2(H2O)2]2·2(HO-BDC)·x(H2O)(1)[Cd(H2biim)2(H2O)2]2·2(HO-BDC)·x(H2O)(2) and [Co(HO-BDC)(bbi)]n(3)) are obtained by using synthetic-condition strategy in the mixed-ligand system 5-hydroxyisophthalic