Slow Magnetic Relaxation in a Co2Dy Trimer and a Co2Dy2 Tetramer

Ritwik Modak, Yeasin Sikdar, Carlos J. Gómez-García, Samia Benmansour, Sudipta Chatterjee, Sanchita Goswami

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The combination of Co(III) and Dy(III) with a compartmental Schiff base ligand (H3L=3-[(2-Hydroxy-3-methoxy-benzylidene)-amino]-propane-1,2-diol), presenting three different coordinating pockets, has allowed the synthesis of two novel Co(III)−Dy(III) complexes: [Co2Dy(HL)4]NO3 ⋅ 2CH3CN (1), a rare example of trinuclear linear CoIII2DyIII complex (and the first with slow relaxation of magnetization in absence of a DC field) and [Co2Dy23−OH)2(HL)2(OAc)6] ⋅ 4.6H2O (2), the first tetranuclear CoIII2DyIII2 cluster with a rhomb-like structure where the Co(III) ions are connected along the short diagonal of the rhomb. 1 presents two different relaxation processes: a fast relaxation dominated by Quantum tunnelling (QT) and a slow relaxation with an energy barrier of 40 K. 2 shows two close relaxation processes without applied DC fields that follow QT and Orbach mechanisms whereas for HDC=500 Oe, the QT is cancelled and a direct term appears. Here we present the synthesis, X-ray structure and magnetic characterization of these two Co(III)−Dy(III) single-ion/molecule magnets.

Original languageEnglish
Pages (from-to)666-677
Number of pages12
JournalChemistry - An Asian Journal
Issue number6
Publication statusPublished - 15-03-2021

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Organic Chemistry


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