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On balancing the QTM and the direct relaxation processes in single-ion magnets – the importance of symmetry control

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Abstract

Two mononuclear trigonal-planar Co(II) complexes [Na(THF)6][Co(OAr)3] 1 and [(THF)3NaCo(OAr)3] 2 (OAr = 2,6-di-tert-butylphenoxo, THF = tetrahydrofuran) with the same coordination number and donor atoms, as well as similar ligand fields except only for the local symmetry of Co(II), were isolated to test the symmetry-magnetization correlations. Although both complexes share similar magnetic anisotropy of the central Co(II) ions (D = −85.4 cm−1 for 1 and D = −80.6 cm−1 for 2), complex 1 exhibits single-ion magnet (SIM) behaviour while 2 displays no slow magnetic relaxation of magnetization with an applied magnetic field up to 7000 Oe. Such distinct performance is ascribed to the different effects of quantum tunneling of magnetization (QTM), which is further associated with the structural symmetry, namely, a strict C2v local symmetry for 1 and Cs local symmetry for 2. Theoretical calculations also indicate a larger value of transversal factors for 2, and hence a stronger QTM to be suppressed with a larger magnetic field at which the direct process is probably promoted, leading to the absence of SIM behavior of 2.

Graphical abstract: On balancing the QTM and the direct relaxation processes in single-ion magnets – the importance of symmetry control

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Publication details

The article was received on 10 Mar 2017, accepted on 22 Apr 2017 and first published on 28 Apr 2017


Article type: Research Article
DOI: 10.1039/C7QI00135E
Citation: Inorg. Chem. Front., 2017, Advance Article
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    On balancing the QTM and the direct relaxation processes in single-ion magnets – the importance of symmetry control

    Y. Deng, T. Han, B. Yin and Y. Zheng, Inorg. Chem. Front., 2017, Advance Article , DOI: 10.1039/C7QI00135E

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