4.8 Article

Zero-field slow magnetic relaxation from single Co(II) ion: a transition metal single-molecule magnet with high anisotropy barrier

Journal

CHEMICAL SCIENCE
Volume 4, Issue 4, Pages 1802-1806

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c3sc21893g

Keywords

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Funding

  1. NSFC [90922033, 21071008]
  2. BJSFC [2122023]
  3. National Basic Research Program of China [2010CB934601, 2013CB933401]
  4. open fund of the Beijing National Laboratory for Molecular Sciences (BNLMS)

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An air-stable star-shaped (CoCo3III)-Co-II complex with only one paramagnetic Co(II) ion in the D-3 coordination environment has been synthesized from a chiral Schiff base ligand. Magnetic studies revealed that this complex exhibits slow magnetic relaxation in the absence of an applied dc field, which is one of the main characteristics of single-molecule magnets (SMMs). The relaxation barrier is as high as 109 K, which is quite large among transition-metal ion-based SMMs. The complex represents the first example of zero-field SMM behavior in a mononuclear six oxygen-coordinate Co(II) complex.

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