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Issue 35, 2017
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Spin-dimer networks: engineering tools to adjust the magnetic interactions in biradicals

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Abstract

Magneto-structural correlations in stable organic biradicals have been studied on the example of weakly exchange coupled models with nitronyl nitroxide and imino nitroxide spin-carrying entities. Here, heteroatom substituted 2,2′-diaza- and 3,3′-diaza-tolane bridged biradicals were compared with the hydrocarbon analogue, while a biphenyl model with its 2,2′-bipyridine counterpart. For a 3,3′-diazatolane bridge the torsional angle between the nitronyl nitroxides and the pyridyl rings increased heavily (∼52–54°) leading to a smaller theoretical intra-dimer exchange coupling value. However, a very large antiferromagnetic coupling was obtained experimentally. This could be appropriately explained by the presence of dominating inter-dimer exchange between the molecules. For the bis(imino nitroxide) with tolane bridge a field induced ordered state between 1.8 to 4.3 T in AC-susceptibility measurements was observed. In terms of a Bose Einstein condensate (BEC) of triplons this phenomenon could be described as a magnetic field induced ordered phase with 3D character.

Graphical abstract: Spin-dimer networks: engineering tools to adjust the magnetic interactions in biradicals

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Publication details

The article was received on 26 Jul 2017, accepted on 15 Aug 2017 and first published on 15 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC03357E
Citation: J. Mater. Chem. C, 2017,5, 9053-9065
  • Open access: Creative Commons BY license
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    Spin-dimer networks: engineering tools to adjust the magnetic interactions in biradicals

    Y. B. Borozdina, E. A. Mostovich, P. T. Cong, L. Postulka, B. Wolf, M. Lang and M. Baumgarten, J. Mater. Chem. C, 2017, 5, 9053
    DOI: 10.1039/C7TC03357E

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