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  Interacting networks of purely organic spin-1/2 dimers

Borozdina, Y., Mostovich, E., Enkelmann, V., Wolf, B., Cong, P., Tutsch, U., et al. (2014). Interacting networks of purely organic spin-1/2 dimers. Journal of Materials Chemistry C, 2(32), 6618-6629. doi:10.1039/c4tc00399c.

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Borozdina, YB1, Author           
Mostovich, E, Author
Enkelmann, V, Author
Wolf, B, Author
Cong, PT, Author
Tutsch, U, Author
Lang, M, Author
Baumgarten, M, Author
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1External Organizations, ou_persistent22              

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 Abstract: In the present study we report the synthesis of some novel nitronyl nitroxide biradical systems 1–4c with various π-bridges between the radical centres. UV-Vis, IR, EPR and X-ray diffraction studies, along with MS and NMR data where appropriate, are described. Magnetic measurements revealed that the biradicals 1c, 3c and 4c exhibit a moderately strong antiferromagnetic intra-molecular exchange, whereas nitroxide 2c shows a significantly higher exchange coupling, which can only be explained by the presence of strong inter-molecular interactions. From DFT calculations performed on the basis of the X-ray crystal structure of compound 4c, a theoretical value of the intra-dimer coupling constant Jintra = −8.6 K is obtained. Direct proof also for inter-molecular arrangement with Jinter ∼ −2 K was provided by the low temperature AC studies of biradical 4c. According to the magnetic characterization, the nitronyl biradical 4c is a promising candidate for a purely organic-based low-dimensional quantum magnet.

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Language(s): eng - English
 Dates: 2014-07
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1039/c4tc00399c
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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: 2 (32) Sequence Number: - Start / End Page: 6618 - 6629 Identifier: ISSN: 2050-7526
CoNE: https://pure.mpg.de/cone/journals/resource/2050-7526