Crystal structure and linear chain antiferromagnetism in Mn(tricyanomethanide)2(4,4-bipyridine)2 |
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| Authors: | Jamie L Manson |
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| Institution: | a Department of Chemistry and Biochemistry, Eastern Washington University, Cheney, WA 99004, USA
b Materials Science Division, Argonne National Laboratory, Bldg. 200, Rm. A185, Argonne, IL 60439, USA |
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| Abstract: | A new linear chain antiferromagnet, namely Mn(tcm)2(4,4′-bipy)2 (tcm=tricyanomethanide and bipy=bipyridine) has been synthesized and characterized by X-ray crystallography and magnetic susceptibility measurements. Each Mn2+ is high-spin S=5/2 and linked to nearest-neighbor spin sites via μ-bridged tcm ligands to form a 1D linear chain while the bipy ligands are monodentate and segregate the chains. Magnetically, a broad maximum in χ′(T) is observed at 2.1 K and likely signifies short-range magnetic order within the chains. A least-squares fit of the χT(T) data to a classical-spin Fisher chain model yielded good agreement for g=2.008(1) and J=−0.217(4) K. No long-range magnetic ordering is observed above 1.6 K due to the presence of very weak interchain magnetic interactions as indicated by inclusion of a mean-field model that gave zJ′=−0.009(1) K. |
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| Keywords: | Tricyanomethanide ligand 4 4&prime -Bipyridine ligand Coordination polymer Crystal structure |
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