Metallacrowns form large rings of [M-N-O] repeat units, which allow for a high density of metal atoms to be in a centralized area.  Thus, these coordination complexes potentially have very interesting magnetic properties.  Nickel(II) metallacrowns are desirable due to their unique catalytic and magnetic properties.  Ligands that form two fused five-membered rings space the metals 108� apart, which allows for the five hydroximate oxygen atoms to be in one plane.  This ligand arrangement leads to the formation of a planar 15-MC-5 complex.  These metallacrowns can then bind lanthanide ions in the central cavity.  Since no extreme conditions are needed for syntheses, metallacrowns are ideal for the facile production of magnetic complexes.  The synthesis of novel nickel(II) 15-metallacrown-5 complexes using various hydroxamic acid ligands will be reported.

Synthesis of novel 15-metallacrown-5 complexes

243rd National Meeting (2012)

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