A unique 2-D hollow sheet structure and magnetic behavior of a cyanide- and triamine-bridged MnIICrIII ferrimagnet |
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| Institution: | Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan;Department of Chemistry, University of Florida, Gainesville, FL, USA |
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| Abstract: | A 2-D cyanide- and triamine-bridged MnIICrIII ferrimagnet, Mn3(dien)2(H2O)2]Cr(CN)6]2 · 4H2O (1), has been prepared by the combination of Mn2+, diethylenetriamine (dien) co-ligand and Cr(CN)6]3?. This compound forms a unique 2-D hollow sheet structure constructed by 1-D ribbon networks on the basis of triamine (dien)-bridged trinuclear MnII units. Compound 1 readily looses all lattice water molecules and irreversibly changes to a dehydrated form, Mn3(dien)2(H2O)2]Cr(CN)6]2 (1a), in the air. Cryomagnetic studies of 1 and 1a reveal an antiferromagnetic interaction between CrIII and MnII ions, and an unusual long-range ferrimagnetic ordering below 30 K (1) and 40 K (1a) with multiple magnetic phase changes below TC. MCD spectra of 1a show a strong Faraday ellipticity associated with the LMCT band of the Cr–CN below 300 nm. Faraday ellipticity is remarkably enhanced below TC in line with the characteristics long-range ferrimagnetic ordering. |
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