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xuewenbin

½ð³æ (³õÈëÎÄ̳)

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Molecular  spin  clusters  continue  to  attract  attention  due  to
their potential applications in quantum computation, 1 magnetic
refrigeration, 2 molecular spintronics 3 and as nanoscale magnets. 4
We have a long-standing interest in the synthesis of Ni(II) and
Co(II) spin clusters using multidentate ligands. 5 Both Ni(II) and
Co(II)  ions  are  good  candidates  to  generate  spin  clusters  that
display  slow  magnetic  relaxation,  i.e.  single-molecule  magnets
(SMMs). 6,7 This  is  because  both  Ni(II)  and  Co(II)  centres  can
display a large single-ion zero-field splitting (ZFS). 8,9
Bis-tris        propane { 2,2¢-(propane-1,3-diyldiimino)bis[2-
(hydroxymethyl)propane-1,3-diol],   H 6 L,   Scheme   1 } contains
multiple binding sites and hence, excellent potential as a bridging
ligand, although its main use is as a biological buffer. However,
its  use  in  cluster  chemistry  is  rare. 10 Herein  we  report  a  Ni 4
cubane  and  a  Co 5 complex  that  displays  an  unusual  Co¨CO
core  topology.  These  represent  the  first  Bis-tris  propane-based
complexes containing these metal ions: both complexes display
ferromagnetic interactions leading to non-zero spin ground states
for each cluster.

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xineun

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xuewenbin(½ð±Ò+70, ·­ÒëEPI+1): 2011-10-21 10:56:44
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