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2018-01-31

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H-Mediated magnetic interactions between layers in a 2D Mn-II-dicyanamide polymer: neutron diffraction, DFT, and quantum Monte Carlo calculations

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https://doi.org/10.1002/ejic.201700971

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We report neutron-diffraction investigations of the quasi-2D Mn-II(dca)(2)(pym)(H2O) (pym = N2C4H4) compound, where high-spin Mn-II ions are bridged by dicyanamide anions, [N(CN)(2)](-) (herein abbreviated dca). Inside the layers, Mn2+ ions are connected by single or double dca bridges. The magnetic phase diagram was established by neutron diffraction on a single crystal. In the low-field phase, the Mn-II ions are antiferromagnetically ordered in the layers, with moments nearly parallel to the c axis, and the layers are antiferromagnetically coupled. The spin-flop phase corresponds to ferromagnetic coupling between the antiferromagnetic layers, in which the Mn-II moments are nearly perpendicular to the c axis. The induced spin-density distribution in the paramagnetic phase, determined by polarized neutron diffraction, visualizes the superexchange pathways through the dca ligands within the layers and through H bonding between neighboring layers. The theoretical spin density obtained by bidimensional periodic DFT calculations is compared with the experimental results. Furthermore, quantum Monte Carlo simulations have been performed to compare the DFT results with experimental susceptibility measurements.

Matèries

Lligands, Estructura cristal·lina (Sòlids), Teoria del funcional de densitat, Propietats magnètiques, Metalls de transició

Matèries (anglès)

Ligands, Layer structure (Solids), Density functionals, Magnetic properties, Transition metals

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Articles publicats en revistes (Química Inorgànica i Orgànica)

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GILLON, Beatrice, et al. H-Mediated magnetic interactions between layers in a 2D Mn-II-dicyanamide polymer: neutron diffraction, DFT, and quantum Monte Carlo calculations. European Journal of Inorganic Chemistry. 2018. Vol. 3-4, num. 278-288. ISSN 1434-1948. [consulted: 28 of May of 2026]. Available at: https://hdl.handle.net/2445/154801

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