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Influence of the Ligand Field on Slow Magnetization Relaxation versus Spin Crossover in Mononuclear Cobalt Complexes


  • We thank the University of Ottawa, NSERC, ERA, CFI, and ORF. O.R.L. and R.H.C. thank CETM for Innovative Energy Storage funded by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under Award Number DE-SC00001055. Work performed at the National High Magnetic Field Laboratory was supported by the US National Science Foundation (DMR1309463 and DMR1157490) and by the State of Florida.


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The electronic and magnetic properties of the complexes [Co(terpy)Cl2] (1), [Co(terpy)(NCS)2] (2), and [Co(terpy)2](NCS)2 (3) were investigated. The coordination environment around CoII in 1 and 2 leads to a high-spin complex at low temperature and single-molecule magnet properties with multiple relaxation pathways. Changing the ligand field and geometry with an additional terpy ligand leads to spin-crossover behavior in 3 with a gradual transition from high spin to low spin.

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