In recent years small molecules have been explored as promising molecular magnetic materials (SMMs). Molecules with a single paramagnetic center responsible for the SMM behavior provide simple model systems for studying magnetic anisotropy. Reports in the literature of complexes with a single lanthanide ion exhibiting SMM behavior and of SMM behavior in mononuclear Co(II) complexes are increasing rapidly. Several iron complexes and very recently a Ni(I) complex were also reported to show SMM behavior. In this work, we prepared the isostructural series of complexes, [Co(TPMA)(MeCN)](BF4)2 and [Co(TPMA)(X)](X) (TPMA = tris-(2-pyridylmethyl)amine, X = Cl-, Br-, I-) to explore the effects of the axial ligand on the magnetic properties. In all of the complexes the Co(II) ion exists in a trigonal bipyramidal (TBP) geometry, with local C3 symmetry and small deviations in the equatorial bond angles. The four compounds behave as SMMs in the presence of a static DC field. Comparison with other previously reported Co(II) complexes with TBP coordination environments reveal that relatively minor structural changes can lead to distinct differences in the magnetic properties. This poster will present and discuss the SMM behavior of four Co(II) complexes with a TBP geometry.

Series of trigonal bipyramidal Co(II) complexes that display SMM behavior

249th National Meeting (2015)

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