Synthesis,structure and magnetic properties of a novel Tb4 spin cluster and synthesis of a Tb chain |
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| Authors: | Roland Bircher Brendan F Abrahams Hans U Güdel Colette Boskovic |
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| Institution: | 1. Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, CH-3000 Bern 9, Switzerland;2. School of Chemistry, University of Melbourne, Vic. 3010, Australia |
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| Abstract: | The syntheses of two new polynuclear TbIII compounds are reported. A tetranuclear complex Tb4(H2L)2(H4L)2(OAc)8] (1), with H4L = 2-((2-hydroxy-benzylidene)-amino)-2-hydroxy-methyl-propane-1,3-diol, has a butterfly-type structure, while Tb(OAc)3MeOH]∞ (2) is a linear chain. A novel binding mode for H2L2− is observed in 1, with two alkoxides each bridging three TbIII ions. The magnetic properties of 1 are determined by the superposition of the ligand field split 7F6 states of TbIII single-ions located on two crystallographically distinct sites. Weak antiferromagnetic exchange interactions possibly contribute to the lowering of the magnetic moment at the lowest temperatures. |
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| Keywords: | Lanthanide Rare earth metal Spin cluster Magnetic measurements Magnetic anisotropy |
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