Slow Magnetic Relaxation in a Co2Dy Trimer and a Co2Dy2 Tetramer

作者: Carlos J. Gómez‐García , Yeasin Sikdar , Samia Benmansour , Sanchita Goswami , Ritwik Modak

DOI: 10.1002/ASIA.202001468

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摘要: The combination of Co(III) and Dy(III) with a compartmental Schiff base ligand (H 3 L = 3-[(2-Hydroxy-3-methoxy-benzylidene)-amino]-propane-1,2-diol), presenting three different coordinating pockets, has allowed the synthesis two novel Co(III)-Dy(III) complexes: [Co 2 Dy(HL) 4 ]NO ·2CH CN ( 1 ), rare example trinuclear linear Co III Dy complex (and first slow relaxation magnetization in absence DC field) (μ -OH) (HL) (OAc) 6 ]·4.6H O tetranuclear cluster rhomb-like structure where ions are connected along short diagonal rhomb. presents processes: fast dominated by Quantum tunnelling (QT) an energy barrier 40 K. shows close processes without applied fields that follow QT Orbach mechanisms whereas for H 500 Oe, is cancelled direct term appears. Here we present synthesis, X-ray magnetic characterization these single-ion/molecule magnets.

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