synthesized, and their magnetic properties were investigated. The chaincomplexes including alternating high-spin FeII ions and low-spin FeIII ions, catena-[FeII(ClO4)2FeIII(bpca)2}]ClO4·3MeNO2 (1·3MeNO2), catena-[FeII(ClO4)(H2O)FeIII(MeL)2}](ClO4)2·2MeNO2·H2O (2·2MeNO2·H2O), catena-[FeII(ClO4)(H2O)FeIII(BuL)2}](ClO4)2·3.5MeNO2 (3·3.5MeNO2), and catena-[FeII(ClO4)(H2O)FeII(H2O)2}0.5FeIII(PhL)2}](ClO4)2