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

Borozdina, Y., Mostovich, E., Cong, P., Postulka, L., Wolf, B., Lang, M., et al. (2017). Spin-dimer networks: engineering tools to adjust the magnetic interactions in biradicals. Journal of Materials Chemistry C, 5(35), 9053-9065. doi:10.1039/c7tc03357e.

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Borozdina, YB1, Author           
Mostovich, EA, Author
Cong, PT, Author
Postulka, L, Author
Wolf, B, Author
Lang, M, Author
Baumgarten, M, Author
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1External Organizations, ou_persistent22              

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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.

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Language(s): eng - English
 Dates: 2017-08
 Publication Status: Published in print
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 Identifiers: DOI: 10.1039/c7tc03357e
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Title: Journal of Materials Chemistry C
  Other : Journal of Materials Chemistry C: Materials for Optical and Electronic Devices
  Abbreviation : J. Mater. Chem. C
Source Genre: Journal
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Publ. Info: London, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 5 (35) Sequence Number: - Start / End Page: 9053 - 9065 Identifier: ISSN: 2050-7526
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7526