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Probing Molecular Magnetism and a Haldane MOF by Advanced Spectroscopies

ORAL · Invited

Abstract

This talk will focus on our recent studies of single-molecule magnets (SMMs) and a 2D Haldane MOF (metal-organic framework) by far-IR and Raman magneto-spectroscopies (FIRMS and RaMS), inelastic neutron scattering (INS), and high-field EPR (HFEPR). SMMs are of intense interest as a new generation of data storage and spintronics materials. Haldane topological materials in the form of MOFs possess an unusual structure. For SMMs, zero-field splittings (ZFS) in d-metal complexes and intra-manifold separations in f-metal complexes lead to barriers for their magnetic relaxations. We have successfully used the spectroscopies to determine large separations in several SMMs, including CoI2(AsPh3)2 [1], Co(acac-d7)2(D2O)2 (acac = acetylacetonate) [2], Co(14-crown-4)22+ [3], and Er[N(SiMe3)2]3 [4]. In addition, the spectroscopies reveal rarely observed spin-phonon couplings in the molecular compounds. For the topological material, we have found that a 2D Ni(II) MOF possesses a Haldane gap. Our studies of SMMs and the MOF will be presented.

[1] D. H. Moseley et al., Inorg. Chem. 2022, 61, in press (https://doi.org/10.1021/acs.inorgchem.2c02604).

[2] D. H. Moseley et al., Nat. Comm. 2018, 9, 2572.

[3] S. E. Stavretis et al., Chem. Eur. J. 2019, 25, 15846.

[4] D. H. Moseley et al., Inorg. Chem. 2020, 59, 5218.

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Publication: [1] D. H. Moseley et al., Inorg. Chem. 2022, 61, in press (https://doi.org/10.1021/acs.inorgchem.2c02604).<br>[2] D. H. Moseley et al., Nat. Comm. 2018, 9, 2572.<br>[3] S. E. Stavretis et al., Chem. Eur. J. 2019, 25, 15846-15857.<br>[4] D. H. Moseley et al., Inorg. Chem. 2020, 59, 5218-5230.

Presenters

  • Ziling (Ben) Xue

    University of Tennessee, University of Tennessee, Knoxville

Authors

  • Ziling (Ben) Xue

    University of Tennessee, University of Tennessee, Knoxville