The influences of the packing ligand on spin state and magnetic interactions in new oxalates with 3d-transition metals

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Abstract

Two new hetero tri-nuclear oxalates (NH4)8[Fe2Co(C2O4)8]·6H2O and [Fe2Co(C2O4)2(OH)4]·2H2O have been synthesized. The compound presented opposite behaviour in ac-susceptibility measurements, different frustration level and spin–orbit coupling in magnetization ones. The Mössbauer approach pointed to local interactions governed by metal-oxalate strongly coupled unit. The data were interpreted in terms of role of positive (NH4) or negative (OH) bridging ligands on general magnetic properties.

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Cited by (2)

  • Shaping distinct magnetic interactions in molecular compounds

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    Citation Excerpt :

    Thus, the oxalates, located between metal ions, are bonded by one oxygen to metals, while at the extremity of the molecules, the metals are sharing two oxygen ions with the two OH neighbor groups. The most clear result is that all these compounds (except Fe2Co–a, see detailed discussion in [8]) have long range ordering to an essentially anti- ferromagnetic state with TN ranging between 10 K (FeFeCu-h) and 36.8 K (Fe2Co-h). Therefore, the inter-cluster interaction is quite effective in coupling their magnetic moments.

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