6533b871fe1ef96bd12d1889

RESEARCH PRODUCT

Two bimetallic layered materials with “Cu4Fe3” defective cubane units: syntheses, structures and magnetic properties of {[CuII(tn)]2[FeII(CN)6]}3·[Na3FeIII(CN)6]·12H2O (1) and {[CuII(tn)]2[FeII(CN)6]}·KCl·5H2O(2)

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Abstract Reactions of the [Fe III (CN) 6 ] 3− anion with the [Cu II (tn)] 2+ ion (tn = 1,3-diaminopropane) afford the compounds {[Cu II (tn)] 2 [Fe II (CN) 6 ]}3·[Na 3 Fe III (CN) 6 ]·12H 2 O (1) and {[Cu n (tn)] 2 [Fe II (CN) 6 ]}·KCl·5H 2 O (2). Despite the differences concerning their asymmetric units, both structures present strong similar features: in both structures, the Cu(II) ion presents a square-base pyramidal CuN 5 environment and each [Fe II (CN) 6 ] 4− anion is linked to six Cu(II) ions through its six N atoms leading to infinite [Cu II (tn)] 2 [Fe II (CN) 6 ] layers which can be viewed as 2-D layered arrangement generated by the defective cubane units Cu 4 Fe 3 involving Fe-CN-Cu bridges. The most important differences between the two structures concern essentially the inter-layer arrangement which is occupied, in compound 1, by isolated paramagnetic [Fe(CN) 6 ] 3− anions and water molecules, while in compound 2, this interlayer space is occupied by K + , Cl − ions and water molecules. Magnetic data indicate for 1 weak antiferromagnetic interactions and presence of magnetically isolated [Fe III (CN) 6 ] 3− anion and for 2 weak ferromagnetic interactions between the Cu(II) ions.