Syntheses, Crystal Structures and Magnetic Properties of Two One-Dimensional Heterotrimetallic Coordination Polymers

Two novel heterotrimetallic 1D zigzag chain coordination polymers, {[Cu(Me(2)valpn)Dy(DMF)(2)(H2O)Fe (CN)(6)]center dot 1.5H(2)O center dot 0.5CH(3)OH} (1) and {[Cu(Me(2)valpn) Tb(DMF)(2)(H2O)Fe(CN)(6)]center dot H2O center dot CH3OH) (2) (H(2)Me(2)valpn=N,N'-bis(3-methoxysalicylidene)-2,2-dimethyl-1,3-diaminopropane), were prepared by stepwise synthetic approach. Single-crystal X-ray diffraction analysis revealed that each [Fe(CN)(6)](3-) is connected with two [Cu(Me(2)valpn)]Ln(DMF)(2) (H2O)](3+) fragments in a cis-mode. Accordingly, there are two types of bent bridging linkages (Fe-C = N-Cu and Fe-C = N-Ln) in the chain besides the diphenoxo bridges between Cu(II) and Ln(III). In the temperature range of 9.5 similar to 300 K, the dc magnetic susceptibilities of complex 1 are consistent with the Curie-Weiss law and give positive Curie-Weiss constants (theta=13.17 K), indicating the presence of predominant ferromagnetic interactions. The AC magnetic measurements reveal that complex 1 shows no slow magnetization relaxation. CCDC:1815462, 1; 1815483, 2.